U.S. patent application number 11/286287 was filed with the patent office on 2006-06-08 for digital camera having video file creating function.
This patent application is currently assigned to NIKON CORPORATION. Invention is credited to Satoshi Ejima, Akira Ohmura.
Application Number | 20060119711 11/286287 |
Document ID | / |
Family ID | 35539047 |
Filed Date | 2006-06-08 |
United States Patent
Application |
20060119711 |
Kind Code |
A1 |
Ejima; Satoshi ; et
al. |
June 8, 2006 |
Digital camera having video file creating function
Abstract
A digital camera includes an image capturing unit, an image
capturing control unit, and an image processing unit. The image
capturing control unit controls the image capturing unit so as to
obtain a still image. The image processing unit creates freeze
video data used for reproducing the still image for a predetermined
period of time.
Inventors: |
Ejima; Satoshi; (Tokyo,
JP) ; Ohmura; Akira; (Tokyo, JP) |
Correspondence
Address: |
OLIFF & BERRIDGE, PLC
P.O. BOX 19928
ALEXANDRIA
VA
22320
US
|
Assignee: |
NIKON CORPORATION
Tokyo
JP
|
Family ID: |
35539047 |
Appl. No.: |
11/286287 |
Filed: |
November 25, 2005 |
Current U.S.
Class: |
348/222.1 ;
386/E5.072 |
Current CPC
Class: |
H04N 9/7921 20130101;
H04N 9/8042 20130101; H04N 2101/00 20130101; H04N 1/215 20130101;
H04N 9/8047 20130101; H04N 1/2112 20130101; H04N 5/23245 20130101;
H04N 5/907 20130101; H04N 1/212 20130101; H04N 5/772 20130101; H04N
5/775 20130101 |
Class at
Publication: |
348/222.1 |
International
Class: |
H04N 5/228 20060101
H04N005/228 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 3, 2004 |
JP |
2004-351267 |
Dec 3, 2004 |
JP |
2004-351268 |
Dec 3, 2004 |
JP |
2004-351269 |
Dec 3, 2004 |
JP |
2004-351270 |
Claims
1. A digital camera comprising: an image capturing unit which
captures an image of a photographic subject; an image capturing
control unit which controls said image capturing unit to obtain a
still image; and an image processing unit which creates freeze
video data used for reproducing said still image for a
predetermined period of time.
2. The digital camera according to claim 1, wherein said image
processing unit creates, in a data format compliant with a
predetermined video file specification, said freeze video data for
reproducing said still image for the predetermined period of
time.
3. The digital camera according to claim 1, further comprising: a
sound collecting unit which collects a sound to create sound data;
and a sound processing unit which acquires, from said sound
collecting unit, sound data during a period of time including a
point of time when said still image is captured, and then adds said
sound data to said freeze video data so that said sound data is
reproducible in synchronization with said freeze video data.
4. The digital camera according to claim 1, wherein: said image
capturing control unit controls said image capturing unit to create
video data before said still image is captured: and said image
processing unit creates a video file in which said video data and
said freeze video data are connected in a reproduction order.
5. The digital camera according to claim 1, wherein: said image
capturing control unit controls said image capturing unit to create
video data after said still image is captured; and said image
processing unit creates a video file in which said video data and
said freeze video data are connected in a reproduction order.
6. The digital camera according to claim 4, further comprising: a
sound effect processing unit which adds predetermined sound effect
data to said video file such that said predetermined sound effect
data is reproducible in synchronization with a time when freeze
video data reproduction and video data reproduction are
switched.
7. The digital camera according to claim 4, further comprising: an
effective image processing unit which adds to said video file a
predetermined effective image to be inserted when freeze video data
reproduction and video data reproduction are switched, the
predetermined effective image being to effectively show that the
switching between the freeze video data reproduction and the video
data reproduction is done.
8. The digital camera according to claim 4, wherein: said image
capturing control unit creates said video data by reading pixels
with a low resolution from said image capturing unit; and said
image capturing control unit converts a resolution of said still
image obtained through a high resolution reading from said image
capturing unit, so as to create said freeze video data whose number
of pixels matches with that of said video data.
9. The digital camera according to claim 4, wherein said image
capturing control unit increases, by a pixel interpolation, the
number of pixels of said video data which is read with a low
resolution from said image capturing unit; and said image capturing
control unit converts a resolution of said still image obtained
through high resolution reading from said image capturing unit, so
as to create said freeze video data whose number of pixels matches
with that of said video data.
10. The digital camera according to claim 1, further comprising: a
position determination unit which determines in which shooting
position, vertical or horizontal, an image is shot and a rotational
conversion unit which rotationally converts said still image
according to the shooting position, wherein said image processing
unit stores the rotationally converted still image in a video
frame, thereby creating freeze video data used for reproducing the
rotationally converted still image for a predetermined period of
time.
11. The digital camera according to claim 10, wherein when
rotationally converting said still image, said rotational
conversion unit converts the resolution of said still image such
that the number of pixels of said still image on a long side of a
frame is smaller than that on a short side thereof.
12. The digital camera according to claim 10, wherein when
rotationally converting said still image, said rotational
conversion unit adds a predetermined image for aspect adjustment
outside a frame of the rotationally converted still image so as to
maintain an aspect ratio before the rotational conversion.
13. The digital camera according to claim 1, wherein said image
processing unit connects a plurality of pieces of freeze video data
to create a video file usable for an automatic slide
reproduction.
14. The digital camera according to claim 13, wherein said image
processing unit creates, from said still image, an image to be
displayed for one of options to reproduce, and stores the created
image in said video file for a chapter menu.
15. The digital camera according to claim 13, wherein said image
processing unit creates, from a still image with a shooting date
different from that of an immediately preceding still image, an
image to be displayed for one of options to reproduce, and stores
the created image in said video file for a chapter menu.
16. The digital camera according to claim 13, wherein when said
plurality of pieces of freeze video data to connect have different
shooting dates, said image processing unit inserts a shooting date
to a portion at which the dates of the free video data change at
reproduction.
17. The digital camera according to claim 13, wherein said image
processing unit stores, in said video file, identification
information specifying the still image file from which the image to
be displayed is created.
18. A digital camera capable of shooting a video and a still image,
comprising: a first control unit which starts buffering a video
upon an input of a first start signal, and releases the video being
buffered without storing it upon a cancellation of said first start
signal; and a second control unit which shoots and stores a still
image upon an input of a second start signal, and stores video
being buffered in synchronization with said second start
signal.
19. The digital camera according to claim 18, further comprising a
release operating member which has a two-step switch of a half
press and a full press, outputs said first start signal in response
to the half press and cancels said first start signal in response
to a release of the half press, and outputs said second start
signal in response to the full press, wherein: said first control
unit starts buffering a video in response to the half press and
releases the video being buffered without storing it in response to
a release of the half press; and said second control unit shoots
and stores a still image in response to the full press and stores
the video being buffered in synchronization with the full
press.
20. The digital camera according to claim 18, further comprising a
framing determination unit which outputs said first start signal
when detecting that a framing of the digital camera is in a stable
state and cancels said first start signal when detecting that the
framing thereof is in an unstable state, wherein said first control
unit starts buffering a video in response to a detection that the
framing is in a stable state, and releases the video being buffered
without storing it in response to a detection that the framing is
in an unstable state.
21. The digital camera according to claim 18, further comprising a
self-timer unit which outputs said first start signal in response
to a start of a self-timer, cancels said first start signal in
response to a cancellation of said self-timer, and outputs said
second start signal in response to a time elapse of said
self-timer, wherein: said first control unit starts buffering a
video in response to a start of said self-timer and releases the
video being buffered without storing it in response to a
cancellation of said self-timer; and said second control unit
shoots and stores a still image in response to the time elapse of
said self-timer and stores the video being buffered in
synchronization with the time elapse.
22. The digital camera according to claim 18, further comprising a
period determination unit which determines a transition period of
time according to a threshold value, and does not store said video
when the transition period of time is less than the threshold
value, the transition period of time being a time from an input of
said first start signal to an input of said second start
signal.
23. The digital camera according to claim 18, further comprising a
brightness determination unit which evaluates brightness of said
video and does not store said video when evaluating the brightness
of said video to be dark.
24. The digital camera according to claim 23, wherein the
brightness determination unit stores not said video but a sound
portion thereof when evaluating the brightness of said video to be
dark.
25. The digital camera according to claim 18, further comprising a
freeze video creating unit which creates freeze video used for
reproducing a still image for a predetermined period of time,
wherein said second control unit stores a video file in which said
video and said freeze video are connected in reproduction
order.
26. The digital camera according to claim 18, further comprising a
shooting preparation unit which performs a shooting preparation of
an automatic exposure control and/or an automatic focusing control,
wherein said first control unit performs the shooting preparation
in response to an input of said and starts buffering said video
after the shooting preparation.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of
priority from Japanese Patent Application Nos. 2004-351267,
2004-351268, 2004-351269, and 2004-351270, all filed on Dec. 3,
2004, the entire contents of which are incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a digital camera having
video file creating function.
[0004] 2. Description of the Related Art
[0005] With a widespread use of a digital camera in recent years, a
still image file is easily creatable. Such a still image file can
be reproduced and displayed on a computer by using a viewer
program. Also, video-software-dedicated reproduction devices such
as a DVD player have recently come into wide use at home, so that
the a large number of people can enjoy video software easily on a
television at home.
[0006] However, such video reproduction devices specialize in a
video software reproduction, and many of them do not have a
function of reproducing a still image file. For this reason, it has
been difficult to easily reproduce a still image file created in
the digital camera and view the still image on the home
television.
[0007] Japanese Unexamined Patent Application Publication No.
2002-300445 discloses a digital camera in which a video shooting
operation and a still image shooting operation can be easily
switched over. That is, the digital camera disclosed therein starts
shooting the video upon half press to a release button. The digital
camera stops shooting the video in response to a release from the
half press of the release button and then stores a video file in a
recording medium. On the other hand, upon a change from the half
pressing to a full pressing, the digital camera stops shooting the
video and simultaneously starts shooting the still image. At this
time, in the digital camera, both of a video file and a still image
file are created and stored in the recording medium. A link file
between both the files is also stored in the recording medium. The
digital camera disclosed in the document analyzes data of the link
file by using a dedicated reproduction device, and reproduce
related video and still image files sequentially. However, a
general-purpose reproduction device does not have a function of
analyzing the data of the link file disclosed in the document.
Therefore, the still image files created by the digital camera
disclosed in the document cannot be reproduced by the widespread
household video reproduction device.
[0008] Further, the digital camera disclosed in Japanese Unexamined
Patent Application Publication No. 2002-300445 has operational
problems. In general, before starting shooting the still image, a
user often presses the release button halfway several times
repeatedly for composition adjustment or focus adjustment. Upon
every half press operation, the video file is stored in the digital
camera. In other words, many unwanted video files for the user may
be stored therein. In addition, if the release button is fully
pressed at once, a momentary half press state may occur, which may
cause generation and storage of very short, useless video files.
Further, the user tends to pan a camera for the composition
adjustment while halfway pressing the release button. During the
panning, the screen moves largely, so that the screen blurs a lot.
This may cause storage of undesirable video files.
[0009] Furthermore, there is a known technique for reproducing a
video file shot in a vertical position disclosed in Japanese
Unexamined Patent Application Publication No. 2004-248171.
According to this document, at the video reproduction, the video is
rotated to the vertical position for display. As described therein,
a conventional digital camera records the video which is shot in
the vertical position without rotating the image.
SUMMARY OF 7HE INVENTION
[0010] Hereinafter, the invention will be described.
[0011] (1) A digital camera according to an aspect of the invention
includes an image capturing unit, an image capturing control unit,
and an image processing unit. The image capturing unit captures an
image of a photographic subject. The image capturing control unit
controls the image capturing unit to obtain a still image. The
image processing unit creates freeze video data used for
reproducing the still image for a predetermined period of time.
[0012] (2) According to the invention, preferably, the image
processing unit creates the freeze video data used for reproducing
the still image for the predetermined period of time, in a data
format compliant with a predetermined video file specification.
[0013] (3) According to the invention, preferably, the digital
camera further includes a sound collecting unit and a sound
processing unit. The sound collecting unit collects a sound to
create sound data. The sound processing unit acquires, from the
sound collecting unit, sound data during a period of time including
a point of time when the still image is captured, and then adds the
sound data to the freeze video data so that the sound data is
reproducible in synchronization with the freeze video data.
[0014] (4) Furthermore, preferably, the image capturing control
unit controls the image capturing unit to create video data before
the still image is captured. The image processing unit creates a
video file in which the video data and the freeze video data are
connected in reproduction order.
[0015] (5) Furthermore, according to the invention, preferably, the
image capturing control unit controls the image capturing unit to
create video data after the still image is captured. The image
processing unit creates a video file in which the video data and
the freeze video data are connected in reproduction order.
[0016] (6) Furthermore, according to the invention, preferably, the
digital camera further includes a sound effect processing unit. The
sound effect processing unit adds predetermined sound effect data
to the video file such that the predetermined sound effect data is
reproducible in synchronization with a time when freeze video data
reproduction and video data reproduction are switched.
[0017] (7) Preferably, the digital camera further includes an
effective image processing unit. The effective image processing
unit adds to the video file a predetermined effective image to be
inserted when the freeze video data reproduction and the video data
reproduction are switched. The predetermined effective image
effectively shows that the switching between the free video data
reproduction and the video data reproduction is done.
[0018] (8) Furthermore, preferably, the image capturing control
unit creates the video data by reading pixels with a low resolution
from the image capturing unit. Also, the image capturing control
unit converts a resolution of the still image obtained through a
high resolution reading from the image capturing unit, so as to
create the freeze video data whose number of pixels match with that
of the video data.
[0019] (9) Furthermore, preferably, the image capturing control
unit increases, by a pixel interpolation, the number of pixels of
the video data which is read with a low resolution from the image
capturing unit. In addition, the image capturing control unit
converts a resolution of the still image obtained through a high
resolution reading from the image capturing unit, so as to create
the freeze video data whose number of pixels matches with that of
the video data.
[0020] (10) Furthermore, preferably, the digital camera further
includes a position determination unit and a rotational conversion
unit. The position determination unit determines in which shooting
position, vertical or horizontal, an image is shot. The rotational
conversion unit rotationally converts the still image according to
the shooting position. The image processing unit stores the
rotationally converted still image in a video frame, thereby
creating freeze video data used for reproducing the rotationally
converted still image for a predetermined period of time.
[0021] (11) Furthermore, preferably, when rotationally converting
the still image, the rotational conversion unit converts the
resolution of the still image such that the number of pixels of the
still image on a long side of a frame is smaller than that of the
still image on a short side thereof.
[0022] (12) Furthermore, preferably, when rotationally converting
the still image, the rotational conversion unit adds a
predetermined image for aspect adjustment outside a frame of the
rotationally converted still image so as to maintain an aspect
ratio before the rotational conversion.
[0023] (13) Furthermore, preferably, the image processing unit
connects a plurality of pieces of freeze video data to create a
video file which is usable for an automatic slide reproduction.
[0024] (14) Furthermore, preferably, the image processing unit
creates from a still image an image to be displayed for one of
options to reproduce, and stores the created image in the video
file for a chapter menu.
[0025] (15) Furthermore, preferably, the image processing unit
creates, from a still image with a different shooting date from
that of an immediately preceding still image, an image to be
displayed for one of options to reproduce, and stores the created
image in the video file for a chapter menu.
[0026] (16) Furthermore, preferably, when the plurality of pieces
of freeze video data to connect have different shooting dates, the
image processing unit inserts a shooting date to a portion at which
the dates of the freeze video data change at reproduction.
[0027] (17) Furthermore, preferably, the image processing unit
stores in the video file identification information specifying a
still image file from which the image to be displayed is
created.
[0028] (18) A second digital camera according to another aspect of
the invention is capable of shooting both a video and a still image
and includes a first control unit and a second control unit. The
first control unit starts buffering a video upon an input of a
first start signal, and releases the video being buffered without
storing it upon the cancellation of the first start signal. The
second control unit shoots and stores a still image upon an input
of a second start signal, and stores the video being buffered in
synchronization with the second start signal.
[0029] (19) Further, preferably, the second digital camera further
includes a release operating member. The release operating member
has two-step switch of a half press and a full press. In addition,
the release operating member outputs the first start signal in
response to the half press and cancels the first start signal in
response to a release of the half press. Moreover, the release
operating member outputs the second start signal in response to the
full press. The first control unit starts buffering a video in
response to the half press and releases the video being buffered
without storing it in response to a release of the half press. The
second control unit shoots and stores a still image in response to
the full press and stores the video being buffered in
synchronization with the full press.
[0030] (20) Furthermore, preferably, the second digital camera
further includes a framing determination unit. The framing
determination unit outputs the first start signal when detecting
that a framing of the digital camera-is in a stable state. In
addition, the framing determination unit cancels the first start
signal when detecting that the framing thereof is in an unstable
state. On the other hand, the first control unit starts buffering a
video in response to a detection that the framing is in the stable
state and releases the video being buffered without storing it when
detecting that the framing is in the unstable state.
[0031] (21) Furthermore, preferably, the second digital camera
further includes a self-timer unit. The self-timer unit outputs the
first start signal in response to a start of a self-timer and
cancels the first start signal in response to a cancellation of the
self-timer. In addition, the self-timer unit outputs the second
start signal in response to the time elapse of the self-timer. On
the other hand, the first control unit starts buffering a video in
response to a start of the self-timer and releases the video being
buffered without storing it in response to a cancellation of the
self-timer. The second control unit shoots and stores a still image
in response to the time elapse of the self-timer and stores the
video being buffered in synchronization with the time elapse.
[0032] (22) Furthermore, preferably, the second digital camera
further includes a period determination unit. The period
determination unit determines a transition period of time according
to a threshold value and does not store the video when the
transition period of time is less than the threshold value. The
transition period of time is a time from when the first start
signal is input to when the second start signal is input.
[0033] (23) Furthermore, preferably, the second digital camera
further includes a brightness determination unit. The brightness
determination unit evaluates the brightness of the video and does
not store the video when evaluating the brightness of the video to
be dark.
[0034] (24) Furthermore, preferably, the brightness determination
unit stores not the video but a sound portion of the video when
evaluating the brightness of the video to be dark.
[0035] (25) Furthermore, preferably, the second digital camera
further includes a freeze video creating unit. The freeze video
creating unit creates freeze video used for reproducing the still
image for a predetermined period of time. The second control unit
stores a video file in which the video and the freeze video are
connected in reproduction order.
[0036] (26) Furthermore, preferably, the second digital camera
further includes a shooting preparation unit. The shooting
preparation unit performs a shooting preparation of an automatic
exposure control and/or an automatic focusing control. The first
control unit performs the shooting preparation in response to an
input of the first start signal and starts buffering the video
after the shooting preparation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The nature, principle, and utility of the invention will
become more apparent from the following detailed description when
read in conjunction with the accompanying drawings in which like
parts are designated by identical reference numbers, in which:
[0038] FIG. 1 is a block diagram illustrating the configuration of
a first embodiment of the invention;
[0039] FIG. 2 is a flowchart explaining operations according to the
first embodiment;
[0040] FIG. 3A is a view explaining a folder in which a file is
stored;
[0041] FIG. 3B is a view explaining a folder in which a file is
stored;
[0042] FIG. 4A is a view illustrating a rotational conversion for a
VGA still image according to a shooting position;
[0043] FIG. 4B is a view illustrating a rotational conversion for a
VGA still image according to a shooting position;
[0044] FIG. 5 is a view illustrating a file structure in which
video files are connected to one another;
[0045] FIG. 6 is a flowchart explaining operations according to a
second embodiment;
[0046] FIG. 7 is a flowchart explaining operations according to a
third embodiment;
[0047] FIG. 8 is a flowchart explaining operations according to a
fourth embodiment;
[0048] FIG. 9 is a flowchart explaining operations according to a
fifth embodiment;
[0049] FIG. 10 is a flowchart explaining operations according to a
sixth embodiment;
[0050] FIG. 11 is a flowchart explaining operations according to a
seventh embodiment;
[0051] FIG. 12 is a flowchart explaining operations according to an
eighth embodiment;
[0052] FIG. 13 is a flowchart explaining operations according to a
ninth embodiment;
[0053] FIG. 14 is a flowchart explaining operations according to a
tenth embodiment;
[0054] FIG. 15A is a view illustrating a display screen; and
[0055] FIG. 15B is a view illustrating a display screen.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0056] Hereinafter, preferred embodiments of the invention will be
described in detail with reference to the accompanying
drawings.
First Embodiment
Configuration of a First Embodiment
[0057] FIG. 1 is a block diagram illustrating the configuration of
a first embodiment of the invention.
[0058] In FIG. 1, a digital camera 11 is mounted with a lens 12. A
light receiving surface of an image sensor 13 is disposed within an
image space of the lens 12. An image capturing operation of the
image sensor 13 is controlled by an output pulse of a timing
generator 22b.
[0059] Image data outputted from the image sensor 13 is temporarily
stored in a buffer memory 17 through an A/D conversion unit 15 and
a signal processing unit 16.
[0060] The buffer memory 17 is connected to a bus 18. The bus 18 is
connected to an image processing unit 19, a card interface 20, a
microprocessor 22, a compression/decompression unit 23, an image
display unit 24, a red eye reduction light emitting unit 30, a
flash emitting unit 31, and a sound processing unit 32.
[0061] The card interface 20 performs data reading and writing
operations with respect to a detachable memory card 21.
[0062] Further, the microprocessor 22 is input with signals from a
switch group 22a, a release button 22c, and a positioning sensor
22d. The switch group 22a includes a menu button, a mode operation
button, a multi-selector button, a command dial, and the like.
[0063] Furthermore, the image display unit 24 displays an image on
a monitor screen 25 provided on a rear surface of the digital
camera 11.
[0064] In addition, the sound processing unit 32 is connected to a
microphone 33.
Operations in the First Embodiment
[0065] The first embodiment has the following operational
features.
[0066] (1) A video is buffered by pressing the release button 22c
halfway.
[0067] (2) A buffered video is deleted by releasing a half pressing
operation.
[0068] (3) A video buffering operation is completed by pressing the
release button 22c fully.
[0069] (4) A freeze video data is created from a still image.
[0070] (5) An image rotation processing on freeze video data is
done according to the camera orientation.
[0071] (6) A merging processing on video data and freeze video data
is performed.
[0072] FIG. 2 is a flowchart explaining the operations described
above. Hereinafter, the operations will be described in the order
of reference step numbers.
[0073] First, when the main power source of the digital camera 11
is turned on, the microprocessor 22 performs a predetermined
initial setting to proceed to step S1.
[0074] In step S1, the microprocessor 22 opens a memory region
within the buffer memory 17. By this operation, videos that were
stored in the buffer memory 17 in the past are deleted.
[0075] In step S2, the digital camera 11 displays captured images
(video) on the monitor screen 25 in almost real time. In this case,
in order to realize a smooth video display, the number of lines to
be read out in the image sensor 13 is reduced, and thus VGA images
having a high frame rate (for example, 30 frames/sec.) are
continuously read out (a so-called draft mode).
[0076] The microprocessor 22 performs an exposure setting in the
draft mode on the basis of a result of a side light processing (for
example, signal levels of VGA images).
[0077] In step S3, the microprocessor 22 performs a focus control
(for example, an AF (automatic focusing) for high contrast using
VGA images) for the draft mode. Here, the microprocessor 22
performs a high-speed focusing control at a low precision in order
to keep up with a composition change by a user.
[0078] In step S4, the microprocessor 22 sequentially drives the
image sensor 1 3 through the timing generator 22b in the draft
mode, thereby sequentially capturing VGA images.
[0079] In step S5, the VGA images that have been read out as
described above are displayed on the monitor screen 25 by the image
display unit 24.
[0080] In step S6, the microprocessor 22 monitors a half pressing
operation on the release button 22c in addition to the monitor
display.
[0081] Here, if the half pressing operation is not detected, the
microprocessor 22 returns to step S2.
[0082] On the other hand, if the half pressing operation (input of
a first start signal) is detected, the microprocessor 22 proceeds
to step S7.
[0083] In step S7, corresponding to the proceeding to the half
press period, the microprocessor 22 performs highly precise
focusing control for shooting a still image so as to prepare for a
still image shooting (pressing a release button fully).
[0084] In step S8, the microprocessor 22 determines an exposure
value (iris value, charge storage time, sensitivity) for the still
image shooting on the basis of the result of a side light
processing (for example, signal levels of VGA images).
[0085] Further, the microprocessor 22 performs an exposure setting
for a video shooting position such that the same exposure as in the
still image shooting is obtained. That is, the microprocessor 22
decides the iris value such that the same exposure result as in the
still image shooting is obtained in a condition in which a charge
storage time for the video shooting position is 1/30 second. At
this time, when the exposure is not sufficient even with an open
iris, the insufficient exposure is supplemented by increasing the
sensitivity (gain of an A/D converter 15).
[0086] Meanwhile, in a case in which the exposure is excessive even
with the minimum iris aperture, for example, the charge storage
time is set to be reduced to 1/100 second.
[0087] In step S9, the microprocessor 22 sequentially drives the
image sensor 13 through the timing generator 22b in the draft mode
so as to keep capturing VGA images.
[0088] In step S10, after the microprocessor 22 has completed an AF
(automatic focusing) process (step S7) and an AE (automatic
exposure) process (Step S8), the microprocessor 22 starts a video
buffering (storing the VGA images on the buffer memory 1 7 as video
frames) with respect to the VGA images.
[0089] Further, when the upper limit time (for example, three
seconds) of the video shooting is exceeded, the microprocessor 22
sequentially deletes the video frames from the oldest one. By this
operation, up-to-date video frames which do not exceed the upper
limit time are maintained in the buffer memory 17.
[0090] In step S11, the image display unit 24 sequentially displays
the VGA images on the monitor screen 25.
[0091] In step S12, upon a release of a half pressing operation on
the release button 22c during the video buffering period, the
microprocessor 22 returns to step S1. In step S1, the video data
buffered in the buffer memory 17 is deleted without being stored
therein. After the buffered video data is deleted, the
microprocessor 22 resumes an operation subsequent to step S2 before
the half pressing operation.
[0092] On the other hand, if the half pressing operation on the
release button 22c is continued, the microprocessor 22 proceeds to
step S13.
[0093] In step S13, the microprocessor 22 determines whether or not
the release button 22c is fully pressed.
[0094] If the full pressing operation (input of a second start
signal) is detected, the microprocessor 22 proceeds to step
S14.
[0095] Meanwhile, if the full pressing operation is not detected,
the microprocessor 22 returns to step S9.
[0096] In step S14, the microprocessor 22 performs an exposure
operation on the still image by using the exposure value for the
still image shooting. As such, by setting the exposure conditions
on the video shooting (step S9) and the still image shooting (step
S14), it is possible to almost match the brightness of the still
image with the brightness of the video.
[0097] Subsequently, the microprocessor 22 sequentially drives the
image sensor 13 through the timing generator 22b in an overall
pixel reading mode and reads out high-resolution still images. The
still images are digitized by the A/D converter 15 and are
subjected to a defect pixel correction process or a gray scale
correction process by the signal processing unit 16.
[0098] Then, the still images are temporarily stored in the buffer
memory 17 to be subjected to an image processing such as color
interpolation, color calibration, noise removal, and outline
emphasis by the image processing unit 19. The
compression/decompression unit 23 compresses the still images which
have been subjected to the image processing.
[0099] In addition, the image processing unit 19 may perform a
signal processing for red eye reduction with respect to a region
where the red eye effect is detected. Moreover, the image
processing unit 19 may analyze gray scales of the still images and
then perform a gray scale correction process so as to make a low
exposed image region bright.
[0100] As such, in particular, a still image in which pixel
deterioration can be easily recognized has a high resolution by
performing various image processes for only the still images. In
addition, the entire processing time can be reduced by omitting an
image processing for videos.
[0101] In step S15, a still image folder that stores the still
images is provided in the memory card 21, as shown in FIG. 3B, and
the card interface 20 stores an image-compressed still image file
in one of the hierarchies of the still image folder.
[0102] In step S16, the image processing unit 19 converts the
resolution of the still image stored in the buffer memory 17 into a
VGA size.
[0103] In step S17, the microprocessor 22 detects the camera
orientation during a still image shooting from an output of the
positioning sensor 22d.
[0104] Here, when the still image is shot in a vertical position,
the microprocessor 22 adopts the still image whose resolution has
been converted into the VGA size, as shown in FIG. 4A.
[0105] On the other hand, as shown in FIG. 4B, when the still image
is shot in a horizontal position, the image processing unit 19
rotates image data having a VGA size of `640 pixels in a row by 480
pixels in a column`. At this time, a resolution conversion is also
performed such that a long side after the rotational conversion has
the number of pixels below that of a short side before the
rotational conversion, thereby obtaining image data having `360
pixels in a row by 480 pixels in a column`. Further, the image
processing unit 19 adds a predetermined image (image representing a
space or the like) outside a frame range of an image, which has
been subjected to the rotational conversion process, so as to
maintain the aspect ratio before the rotational conversion process,
thereby obtaining an image having `640 pixels in a row by 480
pixels in a column`.
[0106] In step S18, the microprocessor 22 creates freeze video
data, which is reproduced as video frames for three seconds, by
using the VGA still images which have been subjected to the process
in step S17.
[0107] For example, in the case of freeze video data following a
Motion JPEG format, compressed data of the VGA still images is
copied to be sequentially stored in a plurality of video frames. In
addition, in the case of freeze video data following an MPEG
format, compressed data of the VGA still images is copied to be
stored in a plurality of I pictures, and information, which
indicates that an estimation difference between frames is zero, is
stored in an intermediate P or B picture.
[0108] In step S19, the microprocessor 22 stores the VGA still
images as information on header of the video data in the buffer
memory 17. This information is used as header information such as a
thumbnail; when the image data in the buffer is encoded so as to
have a predetermined video file format such as an MPEG, or the
information is used as a so-called capture menu for video
reproduction.
[0109] Further, for a video reproduction device (or, reproduction
program), there is software showing an image of a first frame of
the video as a thumbnail image. Accordingly, a VGA still image may
be stored as the first frame of a video. In this case, even though
the VGA still image is reproduced for a moment (for example, 1/30
second) at the video reproduction, it does not affects a video
watching much.
[0110] Through these processes, when video data is to be used later
or is reproduced in a digital camera, there is an advantage in that
desired data can be easily searched. In addition, as compared with
a case in which still images and videos are separately stored, it
is advantageous that correlation information on both types of data
items is not necessary.
[0111] In step S20, the microprocessor 22 performs an editing
process such that the freeze video data created in step S18 is
connected to a last frame of the video data in the buffer memory
17.
[0112] In step S21, the compression/decompression unit 23 performs
encoding processes, such as motion JPEG, MPEG2, MPEG4, H264, or the
like, for the edited video data in the buffer memory 17, thereby
creating a video file. As shown in FIG. 3A, a video file folder is
provided in the memory card 21. The card interface 20 stores an
encoded video file in one of the hierarchies of the folder.
[0113] Further, as shown in FIG. 5, the microprocessor 22 may
create a video file in the memory card 21, the video file including
a series of edited video data items. The video file is created by
sequentially connecting the video files, which were stored in the
memory card 21in the past, to up-to-date video files with date
display inserted between some of them.
[0114] In step S22, after the recording process has been completed,
the microprocessor 22 proceeds to step S1 so as to prepare for the
next shooting process. In addition, when the main power source of
the digital camera 11 is turned off, the microprocessor 22 waits
the recording process to be completed so as to terminate the
operation.
Effects, etc. of the First Embodiment
[0115] As describe above, in the-first embodiment, the freeze video
data which reproduces still images for a predetermined period of
time is created. The freeze video data can be reproduced in the
same manner as a typical video, even though a video-dedicated
reproduction device is used.
[0116] Further, in the first embodiment, the video file is created
by connecting the freeze video data to the video data before the
full press operation on a release button. By reproducing the video
file, it is possible to continuously reproduce the still images
(freeze video) and the video data before a release button is fully
pressed at once. As a result, it is not necessary to individually
search a video file portion and a still image portion so as to
reproduce them, thereby realizing a convenient digital camera. In
addition, since the video and the still images are unified as one
video file, a filing work within the memory card 21 becomes
easy.
[0117] Further, since the video buffering operation is released by
releasing the half pressing operation, unnecessary video data is
simply discarded and it is possible to easily perform a video
recording process a number of times.
[0118] Furthermore, in the first embodiment, the video buffering
operation starts after AE and AF operations for the still image
shooting have been completed. Accordingly, the brightness of the
video data and the brightness of the freeze video data can be
approximately equal to each other. As a result, when the video file
is reproduced, the video can be naturally displayed without a
visually recognizable brightness change at a time when the video
changes to the still image or the still image changes to the
video.
[0119] Furthermore, in the first embodiment, the resolution of the
freeze video data is converted corresponding to the screen size
(the number of vertical and horizontal pixels) of the video data in
the draft mode. By performing the resolution conversion, the
display resolution at a portion switching between the video data
and freeze video data does not change. As a result, a smooth
reproduction switch from the video to the freeze video is
realized.
[0120] Furthermore, in the first embodiment, the VGA still images
are rotationally converted corresponding to the shooting position
and then the rotationally converted VGA still images are copied to
be stored in video frames. In this case, since the VGA still images
is rotationally converted only once during a recording operation,
there is an advantage in that processing cost is reduced as
compared with a case in which a reproduction device performs the
rotational conversion for the video frames one by one.
[0121] Furthermore, in the first embodiment, in the rotational
conversion, the VGA size is adjusted. Accordingly, in the
reproduction device, when the display conversion for the horizontal
position/vertical position is performed, a smooth reproduction
switching operation from the video to the freeze video can be
performed without any special aspect conversion process or without
converting display resolution.
[0122] Furthermore, as shown in FIG. 5, a series of video files may
be created as one file in the digital camera 11. With the video
file, the video data and freeze video data can be sequentially
switched to be reproduced in a general-purpose video reproduction
device. For this reason, specified reproduction conditions are not
required, so that it is possible to create a better general-purpose
video file suitable for being transferred to an acquaintance or the
like.
[0123] In addition, in the series of video files shown in FIG. 5,
it is possible to display the capture menu in which VGA still
images are arranged as a selection item by using the
general-purpose reproduction device. By operating the capture menu,
it is possible to directly access a desired image.
[0124] Next, another embodiment will be described.
Second Embodiment
[0125] The configuration of a second embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0126] The second embodiment is characterized in that a sound or an
effective image to show that the switching between video and still
image displays is done (hereinafter, effective switching image) is
added in addition to video data and freeze video data.
[0127] FIG. 6 is a flowchart explaining operations in the second
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 6.
[0128] In steps S120 to S131, the same processes as in steps S1 to
S11 in the first embodiment are performed.
[0129] In step S132, the sound processing unit 32 acquires sound
data (hereinafter, referred to as first sound data) from the
microphone 33 and stores it in the buffer memory 17, simultaneously
with the video buffering, and then sets it as a synchronized
reproduced sound of the video data.
[0130] In steps S133 and S134, the same processes as in steps S12
and S13 in the first embodiment are performed.
[0131] In step S135, the sound processing unit 32 acquires sound
data (hereinafter, referred to as `second sound data`) from the
microphone 33 for three seconds from a period of time when the
release button 22c is fully pressed, and stores it in the buffer
memory 17.
[0132] In steps S136 to S141, the same processes as in steps S14 to
S19 in the first embodiment are performed.
[0133] In step S142, the microprocessor 22 connects a predetermined
effective switching image and freeze video data to a last frame of
video data in the buffer memory 17.
[0134] In step S143, the microprocessor 22 adds predetermined sound
effect data and the second sound data as synchronized reproduced
sounds for the effective switching image and the freeze video data,
respectively.
[0135] In steps S144 and S145, the same processes as in steps S21
and S22 in the first embodiment are performed.
Effects, etc. of the Second Embodiment
[0136] As described above, in the second embodiment, it is possible
to obtain the same effects as in the first embodiment.
[0137] Further, in the second embodiment, the second sound data
during a period of time including a period of time when still
images are captured is added to the freeze video data as a
synchronized reproduced sound. As a result, when the freeze video
data is reproduced, a sound at a time of capturing the data can be
reproduced, so that it is possible to make the freeze video data
even more realistic.
[0138] Furthermore, in the second embodiment, special effects
(sound effect data and effective switching image) are added at a
portion switching between the video and the freeze video (still
images). For example, in the digital camera 11, it is preferable to
selectively add the following special effects.
[0139] (1) A sound that imitates a shutter sound
[0140] (2) An effective switching image that imitates a switching
operation of a shutter
[0141] (3) A combustion sound or an explosion sound of a bulb in a
case of a flash shooting for a still image
[0142] (4) An effective switching image that imitates smoke of the
bulb in a case of a flash shot for a still image
[0143] Further, when the synchronized reproduced sound of the
freeze video data does not exist or is short, preferably, the
freeze video data is reproduced in synchronization with the sound
effect data in a state in which the sound effect data is set to be
slightly long, thereby reinforcing impression on the freeze video
data.
[0144] With the special effects, it is possible to effectively
perform a switching operation from a dynamic image to a static
image at a portion switching between the video data and the freeze
video data.
[0145] Further, at the first and last parts of the sound data, the
sound data is preferably subjected to a fade in or fade out process
so that the sound does not start or stop unexpectedly.
[0146] Furthermore, the second sound data may be shortened to about
one second from a full pressing operation without being matched
with the reproduction time of the freeze video. In this case, there
is no possibility that noise will be recorded, like in a case in
which a camera is put into a bag right after the shooting.
[0147] Next, still another embodiment will be described.
Third Embodiment
[0148] The configuration of a third embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0149] The third embodiment is characterized in that a video file
in which freeze video data and video data are connected in this
order is created.
[0150] FIG. 7 is a flowchart explaining operations in the third
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 7.
[0151] In step S301, the same process as in step SI in the first
embodiment is performed.
[0152] In step S302, before shooting a still image, the sound
processing unit 32 acquires sound data (hereinafter, referred to as
`second sound data`) from the microphone 33 and stores it in the
buffer memory 17. The sound processing unit 32 sequentially
discards past sound data exceeding three seconds among the second
sound data items.
[0153] In steps S303 to S310, the same processes as in steps S2 to
S9 in the first embodiment are performed.
[0154] In steps S311, the same process as in step S11 in the first
embodiment is performed.
[0155] In step S312, upon a release of the half press to the
release button 22c after such a half pressing operation, the
microprocessor 22 returns to step S302.
[0156] On the other hand, if the half pressing operation on the
release button 22c is continued, the microprocessor 22 proceeds to
step S313.
[0157] In step S313, the microprocessor 22 determines whether or
not the release button 22c is fully pressed.
[0158] If the full pressing operation is detected, the
microprocessor 22 proceeds to step S314.
[0159] Meanwhile, if the full pressing operation is not detected,
the microprocessor 22 returns to step S310.
[0160] In steps S314, the same process as in step S14 in the first
embodiment is performed.
[0161] In step S315, the microprocessor 22 stops storing the second
sound data.
[0162] In step S316, the microprocessor 22 sequentially drives the
image sensor 13 through the timing generator 22b in the draft mode
to thereby store VGA-sized video data corresponding to three
seconds in the buffer memory 17. The sound processing unit 32
acquires sound data (hereinafter, referred to as `first sound
data`) from the microphone 33 for the three seconds during which
the video is shot and stores it in the buffer memory 17 as a
synchronized reproduced sound.
[0163] In steps S317 to S320, the same processes as in steps S15
and S18 in the first embodiment are performed.
[0164] In step S321, the microprocessor 22 performs an editing
process such that a predetermined effective switching image and the
video data created in step S316 are connected to a last frame of
the freeze video data in the buffer memory 17.
[0165] In step S322, the microprocessor 22 adds the second sound
data and predetermined sound effect data as synchronized reproduced
sounds for the freeze video data and the effective switching image,
respectively.
[0166] In steps S323 and S324, the same processes as in steps S21
and S22 in the first embodiment are performed.
Effects, etc. of the Third Embodiment
[0167] As described above, in the third embodiment, it is possible
to obtain the same effects as in the first embodiment.
[0168] Further, in the third embodiment, special effects (sound
effect data and effective switching image) are added at a portion
switching between the video and the freeze video (still images).
For example, in the digital camera 11, it is preferable to
selectively add the following special effects.
[0169] (1) A sound that gives a starting sound such as `start!`
[0170] (2) An effective switching image that imitates a switching
operation of a clapperboard in making a film
[0171] (3) A combustion sound or an explosion sound of a bulb in a
case of a flash shooting for a still image
[0172] (4) An effective switching image that imitates smoke of the
bulb in a case of a flash shooting for a still image
[0173] By using the special effects, it is possible to effectively
perform a switching operation from the static image to the dynamic
mode.
[0174] Next, still another embodiment will be described.
Fourth Embodiment
[0175] The configuration of a fourth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0176] The fourth embodiment is characterized in that a video file
for automatic slide view is created by connecting a plurality of
freeze video data items.
[0177] FIG. 8 is a flowchart explaining operations in the fourth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 8.
[0178] In steps S401 to S409, the same processes as in steps S1 to
S9 in the first embodiment are performed.
[0179] In steps S410 to S417, the same processes as in steps S11 to
S18 in the first embodiment are performed.
[0180] In step S418, the microprocessor 22 adds identification
information for specifying an original still image file to the
freeze video data.
[0181] In step S419, the microprocessor 22 compares a shooting date
of a previously shot still image file with a shooting date of an
up-to-date still image file.
[0182] If the shooting dates of the files are different from each
other, the microprocessor 22 determines that there is a change of a
shooting date to proceed to step S420.
[0183] On the other hand, if the shooting dates of the files are
equal to each other, the microprocessor 22 proceeds to step
S421.
[0184] In step S420, the microprocessor 22 creates an image
including date information displayed thereon and adds it as a first
frame of the freeze video data.
[0185] In step S421, the microprocessor 22 performs an editing
process such that the up-to-date freeze video data is connected to
the video file (in which the past freeze video data items are
connected to one another) for automatic slide view stored in the
memory card 21.
[0186] In step S422, the microprocessor 22 adds the VGA still image
created in step S416 as a capture menu of the video file for the
automatic slide view.
[0187] In step S423, after the recording process has been
completed, the microprocessor 22 proceeds to step S401 so as to
prepare for the next shooting process. In addition, when the main
power source of the digital camera 11 is turned off, the
microprocessor 22 waits the recording process to be completed so as
to terminate the operation.
Effects, etc. of the Fourth Embodiment
[0188] As described above, in the fourth embodiment, the video file
in which the freeze video data items are connected to one another
is created. By reproducing the video file in a reproduction device
in the same manner as the typical video, it is possible to reliably
and easily perform the automatic slide reproduction.
[0189] Further, in the fourth embodiment, the VGA still image is
added as a capture menu of the video file for the automatic slide
view. Thereby, a user can select a desired VGA still image by using
a chapter menu function of the reproduction device. As a result, it
is possible to start the automatic slide reproduction from the
desired freeze video data.
[0190] Furthermore, in the fourth embodiment, only a VGA still
image with a different date from that of an immediately preceding
still image may be added as the capture menu. In this case, it is
possible to start the automatic slide reproduction from an image
corresponding to a desired shooting date by using the chapter menu
function of the reproduction device.
[0191] Furthermore, in the fourth embodiment, a date is added to a
portion at which the shooting dates of the video files change. As a
result, it is possible to see where the shooting date changes by
the date display during the automatic slide reproduction.
[0192] Furthermore, in the fourth embodiment, the identification
information for specifying a still image file from which the freeze
video data is created is stored for each of the freeze video data
items in the video file. Therefore, by using a function of a
reproduction device, it is possible to easily realize a function
of, for example, switching to high-resolution display of the still
image file according to the identification information during the
automatic slide reproduction.
[0193] Next, still another embodiment will be described.
Fifth Embodiment
[0194] The configuration of a fifth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0195] The fifth embodiment is characterized in that a video
buffering operation is performed when framing of the digital camera
11 is determined to be stable.
[0196] FIG. 9 is a flowchart explaining operations in the fifth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 9.
[0197] In steps S31 to S35, the same processes as in steps S1 to SS
in the first embodiment are performed.
[0198] In step S36, the microprocessor 22 obtains pixel differences
between frames of the VGA image and then obtains a total sum with
respect to the absolute values of the pixel differences.
[0199] If the total sum is less than a threshold value, the
microprocessor 22 determines that the framing is stable (input of a
first start signal), proceeding to step S37.
[0200] On the other hand, if the total sum is more than the
threshold value, the microprocessor 22 determines that the framing
is unstable, returning to step S32.
[0201] In addition, for the determination of the framing stability,
a VGA image may be divided into, for example, 255 blocks, so as to
obtain the average brightness for each block, and then the framing
stability may be determined from the variation of the average
brightness between frames. Alternatively, when a face of a
photographic subject is detected by a known face recognition
technique, the framing stability may be determined from a movement
of the face of the photographic subject and a size change
thereof.
[0202] In steps S37 to S41, the same processes as in steps S7 to
S11 in the first embodiment are performed.
[0203] In step S42, the microprocessor 22 determines whether or not
the release button 22c has been fully pressed.
[0204] If the full pressing operation is detected, the
microprocessor 22 proceeds to step S44.
[0205] Meanwhile, if the full pressing operation is not detected,
the microprocessor 22 returns to step S43 so as to continue the
video buffering operation.
[0206] In step 543, the microprocessor 22 continues to determine
the framing stability even when the video buffering operation is
performed.
[0207] As a result, when the framing is determined to be stable,
the microprocessor 22 returns to step S39 so as to continue the
video buffering operation.
[0208] On the other hand, if the framing is determined to be
unstable (cancellation of the first start signal), the
microprocessor 22 returns to step S31. In this case, the video data
buffered in the buffer memory 17 is deleted without being stored
therein. After the buffered video data is deleted, the
microprocessor 22 resumes an operation subsequent to step S32.
[0209] In steps 544 to S52, the same processes as in steps S14 to
S22 in the first embodiment are performed.
Effects, etc. of the Fifth Embodiment
[0210] As describe above, in the fifth embodiment, the video
buffering operation starts when the framing is determined to be
stable, and when the framing is determined to be unstable, the
buffered video is deleted without being stored therein. By using
such a function, even though a user is poor at the half pressing
operation on the release button 22c, it is possible to easily start
and cancel the video buffering operation.
[0211] Further, in the fifth embodiment, the video buffering
operation may be performed only in a condition that the release
button is halfway pressed and the framing is stable.
[0212] Furthermore, in the fifth embodiment, even though the
movement of the photographic subject causes the video capturing
operation to start, however, with a digital camera (for example, a
mobile camera phone) added with an illumination function, the video
capturing operation may start in conjunction with an ON operation
of the illumination function.
[0213] Next, still another embodiment will be described.
Sixth Embodiment
[0214] The configuration of a sixth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0215] The sixth embodiment is characterized in that the video
buffering operation is performed by using a self-timer.
[0216] FIG. 10 is a flowchart explaining operations in the sixth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 10.
[0217] In steps S61 to S65, the same processes as in steps S1 to S5
in the first embodiment are performed.
[0218] In step S66, when the release button 22c is pressed under a
state in which the switch group 22a is set in a self-timer mode,
the microprocessor 22 determines that the self-timer has started to
work.
[0219] As such, when it is detected (input of the first start
signal) that the self-timer has started to work, the microprocessor
22 proceeds to step S67.
[0220] On the other hand, if it is not detected that the self-timer
does not work, the microprocessor 22 returns to step S62.
[0221] In steps S67 to S71, the same processes as in steps S7 to
S11 in the first embodiment are performed.
[0222] In step S72, when the switch group 22a is set in a mode
other than the self-timer mode, the microprocessor 22 determines
that the self-timer does not work.
[0223] On the other hand, if the self-timer does not work
(cancellation of the first start signal), the microprocessor 22
returns to step S61. In this case, the video data buffered in the
buffer memory 17 is deleted without being stored therein. After the
buffered video data is deleted, the microprocessor 22 resumes an
operation subsequent to step S62.
[0224] Meanwhile, when the self-timer keeps working, the
microprocessor 22 proceeds to step S73.
[0225] In step S73, the microprocessor 22 determines whether or not
the setting time of the self-timer has elapsed.
[0226] If the setting time of the self-timer has elapsed (input of
the second start signal), the microprocessor 22 proceeds to step
S74.
[0227] On the other hand, if the setting time of the self-timer has
not elapsed, the microprocessor 22 proceeds to step S69 so as to
keep buffering during the self-timer period.
[0228] In steps S74 to S82, the same processes as in steps S14 to
S22 in the fourth embodiment are performed.
Effects, etc. of the Sixth Embodiment
[0229] As describe above, in the sixth embodiment, the video
buffering operation is performed 10 while the self-timer works. In
this case, immediately before a still image shooting by the
self-timer, it is possible to record various scenes happening in
front of a digital camera as a video. Further, since the buffered
video is deleted at the same time with the cancellation of the
self-timer, it is preventable of accumulation of unnecessary videos
in the memory card 21.
[0230] Next, still another embodiment will be described.
Seventh Embodiment
[0231] The configuration of a seventh embodiment is the same as
that of the first embodiment (FIG. 1), and thus explanation thereof
will be omitted.
[0232] The seventh embodiment is characterized in that a video
recording operation is controlled depending on the brightness of a
photographic subject.
[0233] FIG. 11 is a flowchart explaining operations in the seventh
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 11.
[0234] In steps S91 to S98, the same processes as in steps SI to S8
in the first embodiment are performed.
[0235] In step S99, the microprocessor 22 determines whether or not
the brightness of a VGA image (that is, the brightness of a
photographic subject) is higher than a first threshold value. The
first threshold value is for determining whether or not the
brightness of the photographic subject is suitable for a video
shooting.
[0236] If the brightness of the photographic subject is higher than
the first threshold value, the microprocessor 22 determines that
the brightness of the photographic subject is suitable for the
video shooting, proceeding to step S101.
[0237] On the other hand, if the brightness of the photographic
subject is lower than the first threshold value, the microprocessor
22 determines that the brightness of the photographic subject is
not suitable for the video shooting, proceeding to step S100.
[0238] In step S100, the microprocessor 22 stores only sound data
acquired from the sound processing unit 32 in the buffer memory 17.
Then, the microprocessor 22 proceeds to step S103.
[0239] In step 5101, the microprocessor 22 sequentially drives the
image sensor 13 through the timing generator 22b in the draft mode
to thereby keep shooting VGA images.
[0240] In step S102, the microprocessor 22 sequentially stores the
VGA images and the sound data in the buffer memory 17.
[0241] In step S103, the image display unit 24 sequentially
displays the VGA images on the monitor screen 25.
[0242] In step S104, if a half pressing operation on the release
button 22c is released during the video buffering operation, the
microprocessor 22 returns to step S91. Thereby, the buffered video
is deleted without being stored by returning to the step S91. After
the buffered video is deleted, the microprocessor 22 resumes an
operation subsequent to step S92.
[0243] On the other hand, if the half pressing operation on the
release button 22c is continued, the microprocessor 22 proceeds to
step S105.
[0244] In step S105, the microprocessor 22 determines whether or
not the release button 22c has been fully pressed.
[0245] If the full pressing operation is detected, the
microprocessor 22 proceeds to step S106.
[0246] On the other hand, if the full pressing operation is not
detected, the microprocessor 22 returns to step S99.
[0247] In step S106, if there is no buffered video in the buffer
memory 17, the microprocessor 22 proceeds to pre-emission for
reducing a red eye effect in step S107. Meanwhile, if the buffered
video is in the buffering memory 17, it proceeds to step S108
without the pre-emission for reducing the red eye effect. In
general, it takes about one second for the pre-emission for
reducing the red eye effect. As a result, with the pre-emission,
the time interval between the video portion and the still image
portion (freeze video data) is apart, accordingly, an image will be
discontinuous at a connecting point therebetween. For this reason,
the pre-emission is omitted so as to prevent the image at the
connection point from being discontinuous.
[0248] In step S107, the microprocessor 22 controls the flash
emitting unit 31so as to pre-emit for reducing the red eye
effect.
[0249] In step S108, the microprocessor 22 determines whether or
not the brightness of a photographic subject is higher than a
second threshold value. The second threshold value is for
determining whether or not the flash emission is necessary for the
still image shooting.
[0250] If the brightness of the photographic subject is higher than
the second threshold value, the microprocessor 22 determines that
the flash emission operation is not necessary, proceeding to step
S101.
[0251] On the other hand, if the brightness of the photographic
subject is lower than the second threshold value, the
microprocessor 22 determines that the flash emission operation is
necessary, proceeding to step S109.
[0252] In step S109, the microprocessor 22 controls the flash
emitting unit 31 so as to perform the flash emission operation in
synchronization with the still image shooting operation.
[0253] In steps S110 to S114, the same processes as in steps S14 to
S18 in the first embodiment are performed.
[0254] In step S115, the microprocessor 22 determines whether or
not a half pressing time for the release button 22c is shorter than
a third threshold value. The third threshold value is a threshold
value that determines whether or not the release button 22c has
been fully pressed at a stroke, or whether or not the half pressing
operation has been a momentarily invalid operation.
[0255] Here, if the half pressing time is shorter than the third
threshold value, the microprocessor 22 determines that the
momentary video data is not valid, proceeding to step S116.
[0256] On the other hand, if the half pressing time is longer than
the third threshold value, the microprocessor 22 determines that
the video data is valid, proceeding to step S117.
[0257] Further, according to the minimum reproduction time of a
minimum unit GOP (group of pictures) of video data in the video
format, it is preferable to set about 0.5 seconds as the third
threshold value.
[0258] In step S116, the microprocessor 22 deletes invalid video
buffered in the buffer memory 17 and stores the freeze video data
in the memory card 21. Then, the microprocessor 22 proceeds to step
S120.
[0259] In steps S117 to S120, the same processes as in steps S19 to
S22 in the first embodiment are performed.
Effects, etc. of the Seventh Embodiment
[0260] As describe above, in the seventh embodiment, if it is
determined that the video buffering period is short, the video data
is not stored. As a result, it is possible to easily and reasonably
avoid a problem that one burst press to the release button 22c
causes an accumulation of a momentary, unwanted video in a
recording medium.
[0261] Further, in the seventh embodiment, even when the brightness
of the photographic subject is dark, the video data is not stored.
As a result, it is possible to easily and reasonably avoid a
problem that a dark, undesirable video is accumulated in a
recording medium.
[0262] Furthermore, the freeze video data is created from a bright
still image with flash illumination. Conventionally, when video
data is reproduced as freeze video, a video frame as is dark pauses
and displays, so that the image has lots of noise and accordingly
cannot be easily viewed. However, in the seventh embodiment, since
a bright freeze video with flash illumination is displayed, it is
possible to realize bright and clear still image display.
[0263] Furthermore, by switching the reproduction display from the
dark video data to the bright freeze video data with the flash
illumination, it is possible to perform realistic reproduction
display with the flash emission.
[0264] Furthermore, in the seventh embodiment, when the brightness
of the photographic subject is dark, only sound data is stored
instead of the video data. As a result, even in a dark condition
which is not suitable for the video shooting, it is possible to
record images realistically by means of the sound.
[0265] Next, still another embodiment will be described.
Eighth Embodiment
[0266] The configuration of an eighth embodiment is the same as
that of the first embodiment (FIG. 1), and thus explanation thereof
will be omitted.
[0267] The eighth embodiment is characterized in that typical video
data is set at a relatively high compression rate by giving
priority to the data size, and freeze video data is set at a
compression rate lower than that of the video data by giving
priority to the picture quality.
[0268] FIG. 12 is a flowchart explaining operations in the eighth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 12.
[0269] In steps S151 to S170, the same processes as in steps S1 to
S20 in the first embodiment are performed.
[0270] In step S171, the compression/decompression unit 23 encodes
video data stored during a half press. For example, when the video
data is compressed to an MPEG2 video file, the
compression/decompression unit 23 performs the encoding operation
by compressing an I picture serving as a basic image at a first
compression rate (high pressure). Since there is movement between
the frames with regard to the video data, the deterioration of
visual picture quality is reduced even when the compression rate is
set high. In addition, the compressed amount of the video data is
reduced.
[0271] Step S172, subsequently, the decompression unit 23 performs
the encoding operation for the freeze video data. For example, in
the case where the video data is compressed to an MPEG2 video file,
the I picture serving as a basic image is compressed at a second
compression rate (low compression rate). As a result, for the
freeze video data, deterioration of visual picture quality is
reduced. Further, in the case of the freeze video data, since it is
possible to reduce the information amount for a B or P picture
representing image variation between frames even though the
compressed amount of the I picture is large, the compressed amount
of the freeze video data is not greatly increased.
[0272] In step S173, the microprocessor 22 stores compressed data
encoded by the compression/decompression unit 23 in the memory card
21.
[0273] In step S174, the same process as in step S22 in the first
embodiment is performed.
Effects, etc. of the Eighth Embodiment
[0274] As describe above, in the eighth embodiment, the same
effects as in the first embodiment can be obtained.
[0275] Further, in the eighth embodiment, when the video data and
the freeze video data are compressed, the compression rate switches
according to features of both types of the data items.
[0276] Thereby, the picture quality is not visually recognizable,
and it is possible to record an image in which an overall
compressed amount is suppressed to be small.
[0277] Next, still another embodiment will be described.
Ninth Embodiment
[0278] The configuration of a ninth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0279] The ninth embodiment is characterized in that the resolution
of video data switches.
[0280] FIG. 13 is a flowchart explaining operations in the ninth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 13.
[0281] In steps S181 to S189, the same processes as in steps S1 to
S9 in the first embodiment are performed.
[0282] In step S190, the image processing unit 19 enlarges a VGA
image (video frame) by using a pixel interpolation, and thus the
resolution of the VGA image is converted into a resolution of `960
pixels in a row by 720 pixels in a column`. After the resolution
has been converted, the image has a size suitable for screen
display of `1280 pixels in a row by 720 pixels in a column` which
is a simple high-vision format.
[0283] In steps S191 to S196, the same processes as in steps S10 to
S15 in the first embodiment are performed.
[0284] In step S197, the image processing unit 19 performs a
process of reducing the resolution on the basis of still images in
the buffer memory 17, thereby creating a still image (hereinafter,
referred to as a simple high-vision still image) having a
resolution of `960 pixels in a row by 720 pixels in a column` which
is the same as that of the video data.
[0285] In step S198, when it is detected that the simple
high-vision still image has been shot in the horizontal position on
the basis of a detection result on the camera orientation, the
image processing unit 19 performs rotational conversion, resolution
conversion, and space adding processes for the simple high-vision
still image.
[0286] In step S199, the microprocessor 22 creates freeze video
data, which is reproduced as video frames for three seconds, by
using the high-vision still image which has been subjected to the
process in step S198.
[0287] In step S200, the microprocessor 22 stores the simple
high-vision still image as information on the header of the video
data in the buffer memory 17.
[0288] In steps S201 to S205, the same processes as in steps S170
to S1 74 in the eighth embodiment are performed.
Effects, etc. of the Ninth Embodiment
[0289] As describe above, in the ninth embodiment, the same effects
as in the first embodiment can be obtained.
[0290] Further, in the ninth embodiment, each resolution of the
video data and the freeze video data is converted into a resolution
of `960 pixels in a row by 720 pixels in a column`, and thus it is
possible to realize both video and still image displays suitable
for enjoying images in a high-definition television or the like
following the high-vision format.
[0291] Next, still another embodiment will be described.
Tenth Embodiment
[0292] The configuration of a tenth embodiment is the same as that
of the first embodiment (FIG. 1), and thus explanation thereof will
be omitted.
[0293] The tenth embodiment is characterized in that an image
immediately before a full press is acquired from video data as so
to create freeze video data.
[0294] FIG. 14 is a flowchart explaining operations in the tenth
embodiment. Hereinafter, the operations will be described in the
order of reference step numbers shown in FIG. 14.
[0295] In steps S211 to S225, the same processes as in steps S1 to
S15 in the first embodiment are performed.
[0296] In step S226, the microprocessor 22 reads out a VGA image
immediately before a full press from a video buffered in the buffer
memory 17.
[0297] In step S227, the microprocessor 22 rotationally converts
the VGA image immediately before the full press, according to the
camera orientation acquired from the positioning sensor 22d.
[0298] In step S228, the microprocessor 22 creates freeze video
data, which is reproduced as video frames for three seconds, by
using the VGA image which has been subjected to the process in step
S227.
[0299] In step S229, the microprocessor 22 stores the VGA image
immediately before the full pressing operation as information for
the header of the video data in the buffer memory 17.
[0300] In steps S230 to S232, the same processes as in steps S20 to
S22 in the first embodiment are performed.
Effects, etc. of the Tenth Embodiment
[0301] As describe above, in the tenth embodiment, the same effects
as in the first embodiment can be obtained.
[0302] Further, in the tenth embodiment, the freeze video data is
created from the video data immediately before the full pressing
operation. Accordingly, since it is not necessary to reduce the
size of a high-resolution still image so as to create the freeze
video data, there is an advantage in that processing load is
low.
[0303] Next, a reproduction operation on the video file (in which
the video data and freeze video data are connected to one another)
created in the embodiments described above will be described.
[Example of a Reproduction Screen]
[0304] FIG. 15 is a view illustrating a display screen (including a
half-tone image on a display).
[0305] The display screen is created in the image display unit 24
of the digital camera 11 and displayed on an external monitor
connected to the digital camera 11. Alternatively, an external
computer or a video reproduction device may fetch a file group
created in the digital camera 11 through a communication medium or
a recording medium to generate and display the display screen shown
in FIG. 15.
[0306] Hereinafter, the display screen and an operation on the
display screen will be described.
[0307] The display screen shown in FIG. 15A displays a reproduction
screen 100, a thumbnail 101, operation icons 102 and 104, and a
shooting date 106.
[0308] The reproduction screen 100 displays a main reproduced
image, and displays a still image included in a header of the video
file in a default condition.
[0309] In this state, if a user clicks on the reproduction screen
100 or a reproduction icon 105 or presses a reproduction button of
the digital camera 11, a video recorded during a half press or the
like is reproduced on the reproduction screen 100. Then, freeze
video is displayed on the reproduction screen 100.
[0310] If the user does not operate at all, new video files are
sequentially reproduced in the order of a file name or a shooting
date.
[0311] On the other hand, if the user clicks on the reverse icon
102 or the scroll-up icon 104 or operates a reproduction control
button (not shown) of the digital camera 11 while the reproduction
screen 100 is focused and selected, still images displayed on the
reproduction screen 100 are switched in the order of shooting
dates.
[0312] The thumbnail 101 displays a thumbnail of a still image of a
video file. Under a state in which the thumbnail 101 is
focus-selected, if the reverse icon 102 or the scroll-up icon 104
is operated, it is possible to scroll a row of thumbnails 101 left
and right. In this state, by clicking on the thumbnail 101 to
select it, a still image selected by the clicking is displayed on
the reproduction screen 100.
[0313] On the other hand, FIG. 15B is a view illustrating a book
type display screen. The book type display screen displays a date
206, a reproduction screen 200, page advancing icons 202 and 204,
and a reproduction icon 205 on left and right pages.
[0314] By clicking on the page advancing icons 202 and 204, first a
page advancing animation and next the following new pages are
displayed. On the new pages, new still images are displayed in the
order of shooting dates thereof.
[0315] In this state, when the reproduction icon 205 is clicked, a
video is reproduced on the left page first, and then after
completion of the reproduction on the left page, a video is
reproduced on the right page.
[0316] Further, at video reproduction on an external monitor
connected with the digital camera 11, the video file may be
reproduced by pressing the reproduction button of the digital
camera 11 once and the still image may be reproduced by pressing
the reproduction button of the digital camera 11 twice (double
click).
Supplement to the Embodiments
[0317] Further, in the seventh embodiment, when the time of
buffering the video data is shorter than the third threshold value,
the video data is not recorded, thereby making it possible to avoid
storing short, useless video data (refer to steps S115 and S116 in
FIG. 7). This function is not limited to only the seventh
embodiment, but it is preferable to be also applied to the first to
third embodiments and the fifth to tenth embodiments.
[0318] Furthermore, in the seventh embodiment, when the video data
being buffered has a value darker than the first threshold value,
the video data is not recorded, but only the sound data during the
period of time is recorded (refer to steps S99 and S100 in FIG. 7).
This function is also not limited to only the seventh embodiment,
but it is preferable to be also applied to the first to third
embodiments and the fifth to tenth embodiments.
[0319] Furthermore, in the ninth embodiment, the video read out in
the draft mode (low resolution reading mode) is enlarged to a
simple high-vision pixel size to be thus interpolated, and the
still image read out in an overall pixel reading mode is reduced to
the simple high-vision pixel size. This function is also not
limited to only the ninth embodiment, but it is preferable to be
also applied to the first to third embodiments and the fifth to
tenth embodiments.
[0320] In addition, in the first to tenth embodiments described
above, preferably, the following operations are performed.
[0321] (1) Strobe flash is illuminated onto only a still image.
[0322] (2) Sensitivity changes between a video and a still image. A
charge storage time changes between a video and a still image.
[0323] (3) Illumination to reduce a red eye effect is not performed
during a video shooting.
[0324] (4) Noise removing operation is performed for only a still
image.
[0325] (5) When the recording resolution of a still image is lower
than a VGA, a video is not created.
Principles of the Embodiments
[0326] Principles of the embodiments will be described so that the
embodiments can be easily applied to a different embodiment.
[0327] (1) In the embodiments, still images are created by
controlling an image capturing unit, and a video file (freeze video
data) in which the still images are reproduced during a
predetermined period of time is created. The freeze video data can
be reproduced in the same manner as a typical video by means of a
video-dedicated reproduction device. Therefore, even with the
video-dedicated reproduction device, it is possible to reliably and
easily reproduce still images.
[0328] (2) Further, preferably, the freeze video data is to be in a
data format in compliance with predetermined video file
specifications. In this case, it is possible to reliably and easily
reproduce the still images by using a general-purpose video
reproduction device based on the video file specifications.
[0329] (3) Furthermore, in the embodiments, preferably, the sound
data during the still image shooting is added to the video data for
reproducing the freeze video data in synchronization with sound. By
using the freeze video data, both the still image and the sound
during the still image shooting can be reproduced at the same time,
which makes it possible to enjoy even more realistic still
images.
[0330] (4) Furthermore, a typical video shooting may be done at a
timing preceding to still image shooting so as to create video
data. At this time, preferably, the preceding video data and the
subsequently captured freeze video data are connected to one
another to be edited in the order so that they can be organized as
one file.
[0331] For the video file in which the preceding video data and the
subsequently captured freeze video data are connected, correlation
reproduction between the video and the still image can be
implemented without a need of a link file disclosed in Japanese
Unexamined Patent Application Publication No. 2002-300445.
[0332] (5) Furthermore, the typical video shooting may be done at a
timing subsequent to the still image shooting so as to create the
video data. At this time, preferably, the preceding still image
data and the subsequently captured freeze video data are connected
to one another to be edited in the order so that they can be
organized as one file.
[0333] For the video file, the correlation reproduction between the
video and the still image can be implemented without a need of the
link file disclosed in Japanese Unexamined Patent Application
Publication No. 2002-300445.
[0334] (6) Furthermore, in the embodiments, preferably, the sound
effect data is added to a portion at which the freeze video data
reproduction and the video data reproduction are switched. Thereby,
it is possible to create a video file added with image enhancer,
making visually noticeable the switching from/to a still image
to/from a video during the video reproduction.
[0335] (7) Furthermore, in the embodiments, preferably, an
effective switching image is inserted into a portion where the
switching between the freeze video data and the video data
reproduction is done. Thereby, it is possible to create a video
file added with the image enhancer, such as a clear switching from
the static image to the dynamic image or from the dynamic image to
the static image while the video is reproduced.
[0336] (8) However, if the resolutions of the typical video data
and the freeze video data are different from each other, a switch
of the display resolutions frequently occurs while both the data is
reproduced. As a result, a smooth switch from the video to the
freeze video or from the freeze video to the video is
obstructed.
[0337] Accordingly, in the embodiments, preferably, the low
resolution reading operation is performed by the image capturing
unit so as to create the video data, and the still image obtained
by performing high resolution reading operation is
resolution-converted so as to create the freeze video data.
Thereby, the display resolutions of both types of the data items
become close to each other, so that it is possible to avoid the
switch of the display resolutions or to make it visually
unrecognizable.
[0338] (9) Furthermore, it is preferable to increase, by a pixel
interpolation, the number of pixels of the video data which has
been read with the low resolution as well as to convert a
resolution of the still image which has been read with the high
resolution. Through this processing, the display resolutions of
both the video data and still image approach to each other, and the
change in the display resolutions is avoidable or visually
unrecognizable.
[0339] (10) In the embodiments, the still image is rotationally
converted according to the shooting position in the digital camera.
The digital camera stores the rotationally converted still images
in a video frame, thereby creating the freeze video data.
[0340] For example, in the case of a Motion JPEG format, the
rotationally converted still images are copied and sequentially
stored in a plurality of video frames. In addition, when the
estimated difference between frames is used as in the MPEG format,
the rotationally converted still images are copied and stored in a
plurality of I pictures, and information indicating that the
estimated difference between frames is zero is stored in an
intermediated P or B picture.
[0341] In such video specifications, it only has to rotationally
convert the still image only once.
[0342] Therefore, even with the rotational conversion in the
digital camera, an increase of a processing cost falls within a
negligible range.
[0343] Furthermore, the freeze video data can be reproduced in the
same manner as a typical video by using a video reproduction
device. In particular, the freeze video data captured in the
vertical position can also be reproduced in the vertical position
without performing any special operation in the video reproduction
device.
[0344] (11) Further, in the embodiments, preferably, the still
image is rotationally converted, such that the number of pixels of
a still image in a direction of a long side of a frame is smaller
than the number of pixels of the still image in a direction of a
short side thereof.
[0345] In this case, the screen size (the number of vertical and
horizontal pixels) after the rotational conversion is not larger
than the screen size before the rotational conversion. Therefore, a
still image in vertical position can be displayed in a screen
adjusted to the horizontal-position screen size without expanding a
vertical-position image, without performing any special operation
in the video reproduction device.
[0346] (12) Furthermore, in the embodiments, preferably, a
predetermined size-adjusting image is added outside a frame of the
rotationally converted still image, thereby maintaining a
horizontal-position screen aspect ratio.
[0347] In this case, the video reproduction device can reproduce
the vertical-position image as the horizontal-position image
without performing any special aspect conversion process.
[0348] (13) Furthermore, in the embodiments, the freeze video data
for reproducing still images during a predetermined period of time
is created and a plurality of freeze video data items are
connected, thereby creating a video file.
[0349] By creating the special video file, it is possible to
reliably and easily perform the automatic slide reproduction even
with a video-dedicated reproduction device.
[0350] (14) Furthermore, in the embodiments, it is preferable to
create an image to be displayed as one of options to reproduce and
store it in a video file as a chapter menu.
[0351] Thereby, in the reproduction device, by using a function of
the chapter menu, the still images can be displayed as the option.
As a result, a user selects a desired still image so as to start
the automatic slide reproduction from the still image.
[0352] (15) Furthermore, in the embodiments, it is preferable to
create an image to be displayed as one of the options to reproduce
from a still image with a different date from that of an
immediately preceding still image, and store it in the video file
as a chapter menu.
[0353] Thereby, in the reproduction device, by using the function
of the chapter menu, the still image with a different date from
that of an immediately preceding still image can be displayed as
one of the options. As a result, a user selects a desired still
image so as to start the automatic slide reproduction from the
still image of a desired shooting date.
[0354] (16) Furthermore, in the embodiments, preferably, shooting
date information is inserted in a portion where freeze video data
items whose shooting dates are different are connected to one
another. In this case, during the automatic slide reproduction, it
is possible to see where the shooting date changes by the
information display.
[0355] (17) Furthermore, in the embodiments, preferably,
identification information for specifying the still image file is
stored in the video file. In this case, during the automatic slide
reproduction, it is possible to distinguish the still image file
according to the identification information.
[0356] (18) Furthermore, in the embodiments, the digital camera
starts buffering the video when the first start signal is input. In
this state, if the second start signal that instructs the still
image shooting is input, the video being buffered is stored.
[0357] In addition, if the first start signal is cancelled without
the second start signal inputted, the digital camera does not store
the video being buffered but releases it.
[0358] As such, in the operation mode, unnecessary video data can
be easily discarded by releasing the first start signal. As a
result, with a precise and reasonable shoot operation, it is
possible to avoid a disadvantage in that unnecessary videos are
stored in a recording medium.
[0359] (19) Furthermore, in the embodiments, preferably, the first
start signal is output upon a press to a release button halfway,
the first start signal is cancelled upon the release of the half
press, and the second start signal is output upon a full press to
the release button.
[0360] In this case, the video being buffered can be released by
releasing the half press operation. Thereby, with a precise and
reasonable shoot operation, it is possible to avoid storing
unnecessary videos in a recording medium every time the half
pressing operation is repeated.
[0361] (20) Furthermore, in the embodiments, the first start signal
may be output if the framing is detected to be stable, and the
first start signal may be cancelled if the framing is detected to
be unstable.
[0362] In general, a user decides the picture composition before a
still image is shot (that is, before the second signal is input) so
as to make the framing stable. Since the video shooting starts in
this state, it is possible to reliably video-shoot the shape of a
photographic subject immediately before the still image is
shot.
[0363] By using such a function, even though the user is poor at
the half pressing operation on the release button, it is possible
to definitely start the video buffering operation only by making
the framing of a camera stable. In addition, the determination on
the framing may be made by detecting oscillation of the camera or a
lens or by detecting the movement of a monitor screen or the
like.
[0364] (21) Further, the video buffering operation may start when a
self-timer starts to work. In this case, it is possible to store,
as videos, various scenes happening in front of a digital camera
while the self-timer works.
[0365] (22) Furthermore, preferably, if it is determined that a
transition period of time from the first start signal to the second
start signal is shorter than a threshold value, the video is not
stored. In this case, when the still image is shot in a hurry (for
example, when the release button is fully pressed at once), the
recorded video can be removed. As a result, with a precise and
reasonable shooting operation, it is possible to avoid a problem
that momentary, useless videos are accumulated in a recording
medium.
[0366] (23) On the other hand, it is preferable to stop shooting a
video or stop storing the video when the video to shoot is
determined to be dark. This can eliminate storage of a dark video
such as one shot in a dark place without the flash. As a result,
with a precise and reasonable shooting operation, it is possible to
avoid a problem that dark, useless videos are accumulated in the
recording medium.
[0367] (24) Further, when it is determined that the video is dark,
a sound portion of the video may be stored. In this case, it is
more preferable to store the sound only when the sound level is
higher than a predetermined level.
[0368] Thereby, even in a condition which is not suitable for the
video shooting, it is possible to realistically record the place
with the sound.
[0369] (25) Furthermore, the freeze video in which still images are
reproduced for a predetermined period of time may be created. In
this case, it is possible to make the video and the still image as
one file by connecting the video and the freeze video in a
reproduction order. In this case, by reproducing the video file
reversely, it is possible to enjoy the video portion and the still
image portion in the order. In addition, since the video and the
freeze video are arranged as one file, a file arrangement in a
recording medium becomes easy.
[0370] (26) Further, it is preferable that upon an input of the
first start signal a shooting preparation is performed, and
thereafter the video buffering operation starts. According to the
operation sequence, it is possible to perform the video shooting at
a good photographic subject image for which the shooting
preparation has been completed.
[0371] The invention is not limited to the above embodiments and
various modifications may be made without departing from the spirit
and scope of the invention. Any improvement may be made in part or
all of the components.
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