U.S. patent application number 11/980404 was filed with the patent office on 2008-06-12 for captured image outputting system, display control apparatus, liquid crystal projector and digital camera that transmit images via wireless network.
This patent application is currently assigned to SANYO ELECTRIC CO., LTD.. Invention is credited to Yoshinao Hiranuma, Yasuaki Inoue, Hiroki Miura, Yasuhiro Yamazaki.
Application Number | 20080136918 11/980404 |
Document ID | / |
Family ID | 31712389 |
Filed Date | 2008-06-12 |
United States Patent
Application |
20080136918 |
Kind Code |
A1 |
Yamazaki; Yasuhiro ; et
al. |
June 12, 2008 |
Captured image outputting system, display control apparatus, liquid
crystal projector and digital camera that transmit images via
wireless network
Abstract
In a captured image outputting system, an image shot by an image
capturing device is, upon shooting the image thereby,
instantaneously transmitted to a display control device of a
display system via wireless communication. The display system
instantaneously projects the received image on a projection screen.
The display system is comprised of a display device and a display
control device. A liquid crystal projector may serve as the display
device whereas an optional device, for use in wireless
communication, connected to image input terminals of the liquid
crystal projector may serve as the display control device. A
digital still camera may serve as the image capturing device
capable of carrying out wireless communication.
Inventors: |
Yamazaki; Yasuhiro;
(Kumagaya-shi, JP) ; Inoue; Yasuaki; (Saitama-shi,
JP) ; Hiranuma; Yoshinao; (Matsudo-shi, JP) ;
Miura; Hiroki; (Kawaguchi-shi, JP) |
Correspondence
Address: |
MCDERMOTT WILL & EMERY LLP
600 13TH STREET, N.W.
WASHINGTON
DC
20005-3096
US
|
Assignee: |
SANYO ELECTRIC CO., LTD.
Osaka
JP
|
Family ID: |
31712389 |
Appl. No.: |
11/980404 |
Filed: |
October 31, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10751897 |
Jan 7, 2004 |
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11980404 |
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Current U.S.
Class: |
348/207.1 ;
348/744; 348/E5.024; 348/E5.137; 348/E9.025 |
Current CPC
Class: |
H04N 5/74 20130101; G06F
3/14 20130101; H04N 1/00283 20130101; H04N 2201/0055 20130101; H04N
2201/0043 20130101; H04N 2201/0044 20130101; H04N 2201/0084
20130101; H04N 2201/0041 20130101; H04N 2201/0015 20130101 |
Class at
Publication: |
348/207.1 ;
348/744; 348/E05.024; 348/E09.025 |
International
Class: |
H04N 5/225 20060101
H04N005/225; H04N 9/31 20060101 H04N009/31 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 14, 2003 |
JP |
2003-006453 |
Claims
1. (canceled)
2. A captured image outputting system, the system including: an
image capturing device which captures an image of an object and
transmits the image via wireless communication; and a display
system which receives via wireless communication the image
transmitted from said image capturing device and displays the
received image, wherein, prior to transmission of the image,
specifications of an image that is to be transmitted are determined
by said image capturing device and said display system.
3. (canceled)
4. (canceled)
5. (canceled)
6. A captured image outputting system, the system including: an
image capturing device which reads out a captured image according
to a user's instruction to reproduce the image and transmits the
captured image via wireless communication; and a display system
which receives via wireless communication the image transmitted
from said image capturing device and displays the received image,
wherein, upon readout of the image, the read-out image is displayed
almost simultaneously on both a display unit built in said image
capturing device and said display system.
7. (canceled)
8. A captured image outputting system, the system including: an
image capturing device which captures an image of an object and
transmits the captured image via wireless communication; and a
plurality of display systems which receive via wireless
communication the image transmitted from said image capturing
device and display the received image, wherein, prior to
transmission of the image, said image capturing device recognizes a
plurality of display systems as transmission destinations to which
a captured image is to be transmitted, displays the plurality of
candidate transmission destinations thus recognized on a display
unit built in the image capturing device, selects any of the
candidates according to a user's instruction for selection, and
transmits the captured image, upon the capturing of the image, to
the thus selected display system or display systems via wireless
communication.
9. (canceled)
10. A captured image outputting system, the system including: a
plurality of image capturing devices which captures images of an
object and transmit the captured images via wireless communication;
and a display system which receives via wireless communication the
images transmitted from said plurality of image capturing devices
and displays the received images, wherein, prior to reception of
the image, said display system recognizes a plurality of image
capturing devices as transmission sources from which captured
images are to be transmitted, displays the plurality of candidate
transmission sources, selects any of the candidates according to a
user's instruction for selection, and receives the captured image
or images, upon the capturing of the image, from the thus selected
image capturing device or devices via wireless communication.
11. (canceled)
12. A captured image outputting system, the system including: an
image capturing device which captures an image of an object and
transmits the captured image via wireless communication; and a
display system which receives via wireless communication the image
transmitted from said image capturing device and displays the
received image, wherein said display system determines whether the
display of the transmitted image is permitted or rejected based on
a predetermined condition for permission related to priority for
display, and displays the transmitted image only if the display
thereof is permitted.
13. (canceled)
14. A captured image outputting system, the system including: an
image capturing device which captures an image of an object and
transmits the captured image via wireless communication; and a
display system which receives via wireless communication the image
transmitted from said image capturing device and displays the
received image, wherein at least one of said image capturing device
and said display system detects information on connection status of
wireless communication between said image capturing device and said
display system, and displays the information on connection status
almost simultaneously on both a display unit built in the image
capturing device and the display system.
15. (canceled)
16. A captured image outputting system according to claim 12,
wherein the display system displays information on permission or
rejection of the display thus determined
17. (canceled)
18. (canceled)
19. The captured image outputting system according to claim 2,
wherein the image capturing device receives information on a
display capacity of the display system from the display system,
determines specifications of a captured image that is to be
transmitted, based on the received information, and transmits an
image conforming to the specifications to the display system.
20. An image capturing device comprising: an image capturing
control unit which captures an image of an object; a transfer
processing unit which transmits the captured image to a display
system via wireless communication; and a specification setting unit
which determines, prior to transmission of the image,
specifications for an image to be transmitted, based on a display
capacity of the display system, the determination being made
through communication with the display system.
21. An image capturing device comprising: an image capturing
control unit which captures an image of an object; a transfer
processing unit which transmits the captured image to a display
system via wireless communication; a specification setting unit
which determines, prior to transmission of the image,
specifications for an image to be transmitted, based on a display
capacity of the display system, the determination being made
through communication with the display system; a display unit which
displays the captured image; and a reproduction control unit which
instructs the display unit to display the captured image, upon the
capturing of the image, wherein the transfer processing unit
transmits the captured image to the display system upon the
capturing of the image and almost simultaneously with display on
the display unit.
22. An image capturing device comprising: an image capturing
control unit which captures an image of an object; a display unit
which displays the captured image; a reproduction control unit
which reads the captured image according to a user's instruction to
reproduce the image, and instructs the display unit to display the
captured image; and a transfer processing unit which transmits the
captured image to a display system via wireless communication upon
readout of the image and almost simultaneously with display on the
display unit.
23. An image capturing device comprising: an image capturing
control unit which captures an image of an object; a display unit
which displays the captured image; and a transfer processing unit
which transmits the captured image to at least one of a plurality
of display systems via wireless communication, wherein, prior to
transmission of the image, the transfer processing unit recognizes
the plurality of display systems as transmission destinations to
which a captured image is to be transmitted, displays the plurality
of candidate display systems thus recognized on the display unit,
selects any of the candidates according to a user's instruction for
selection, and transmits the captured image, upon the capturing of
the image, to the thus selected display system or display
systems.
24. A display system comprising: a communication unit which
receives a captured image from at least one of a plurality of image
capturing devices via wireless communication; an object setting
unit which sets the received image as an object of display; and a
reproduction control unit which controls an output of the image set
as an object of display, wherein, prior to reception of the image,
the object setting unit recognizes a plurality of image capturing
devices capable of carrying out wireless communication as
transmission sources, displays the plurality of candidate
transmission sources thus recognized, selects any of the candidates
according to a user's instruction for selection, and receives the
image, upon the capturing of the image, from the selected image
capturing device via wireless communication.
25. A display system comprising: a communication unit which
receives a captured image from at least one of a plurality of image
capturing devices via wireless communication; an object setting
unit which sets the received image as an object of display; and a
reproduction control unit which controls the output of the image
set as an object of display, wherein the object setting unit
determines whether the display of the received image is permitted
or rejected based on a predetermined condition for permission
related to priority for display, and the reproduction control unit
outputs the image only if the display thereof is permitted by the
determination.
26. The display system according to claim 26, wherein the object
setting unit sets the condition for permission such that, for a
predetermined period of time after an image is received and
displayed, the display of subsequent images is rejected, and
determines whether the display is permitted or rejected based on
the condition thus set.
27. The display system according to claim 26, wherein the object
setting unit sets the condition for permission such that, only the
first image transmitted after a receiving mode, in which an image
reception is awaited, is entered, is displayed, the object setting
unit determining whether the display is permitted or rejected based
on the condition thus set.
28. An image capturing device comprising: an image capturing
control unit which captures an image of an object; a display unit
which displays the captured image; a reproduction control unit
which instructs the display unit to display the captured image,
upon the capturing of the image; a transfer processing unit which
transmits the captured image to a display system via wireless
communication; and a status display unit which instructs the
display unit to display information on the state of wireless
communication between the image capturing device and the display
system, and transmits the information on the state of communication
to the display system via the transfer processing unit almost
simultaneously with the display.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a display control method
and a shot image outputting system, a display control apparatus, a
liquid crystal projector and a digital camera utilizing said
display control method, and it particularly relates to a technology
by which to transmit the shot images via a wireless network.
[0003] 2. Description of the Related Art
[0004] Display apparatuses, such as liquid crystal projectors
capable of projecting images on a screen, have been used mainly in
various presentations of a business or academic nature. With the
widening use of DVDs in recent years, however, low-priced liquid
crystal projectors are being developed one after another as a
component product of home theaters. This trend for lower prices is
making it easier to introduce liquid crystal projectors for use in
classes of school education.
[0005] On the other hand, contents to be projected by liquid
crystal projectors are often images shot by digital cameras.
Recently, technologies are being proposed for displaying images by
connecting a digital camera directly to a liquid crystal projector
without the use of a personal computer as a medium (see, for
example, the Related Art List (1) below).
Related Art List
[0006] (1) Japanese Patent Application Laid-Open No.
Hei11-317898.
[0007] According to the conventional technologies as mentioned
above, however, when a digital camera is directly connected to a
liquid crystal projector, the operator cannot leave the side of the
liquid crystal projector while displaying the images in the digital
camera on the screen or switching images thereon. As a result, when
the user tries to shoot images with the digital camera connected to
the liquid crystal projector, the shooting range is inconveniently
restricted to the close vicinity of the liquid crystal projector.
Furthermore, since the operator position is limited to the close
proximity of the liquid crystal projector, the operation becomes
difficult especially when a plurality of people are to operate it
by turns. Therefore, such a mode of use is not necessarily suited
to the scenes of school education in which a plurality of students
make their presentations using their respective images.
SUMMARY OF THE INVENTION
[0008] The present invention has been made in view of the foregoing
circumstances and an object thereof is to improve facility in the
displaying of images in a digital camera through the use of a
projector. Another object of the present invention is to propose
new modes of usage in the combination of a projector and a digital
camera.
[0009] A preferred embodiment according to the present invention
relates to a display control method. This method includes:
determining, by an image capturing device and a display system,
specifications of a captured image that is to be transmitted, based
on a display capacity thereof; transmitting a captured image
conforming to the specifications from the image capturing device to
the display system via wireless communication; and receiving the
transmitted image by the display system and displaying the received
image. According to this embodiment, an image conforming to the
display capacity of the display system is transmitted from the
image capturing device. Thus, an optimum image is easily displayed
without manually setting the resolution or file format of the
image.
[0010] Another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the image via wireless communication;
and a display system which receives via wireless communication the
image transmitted from the image capturing device and displays the
received image. Moreover, prior to transmission of the image,
specifications of an image that is to be transmitted are determined
by the image capturing device and the display system. The
specifications may be determined immediately before the
transmission of the image or before shooting the image. For
example, the specifications may be determined at the time of
power-on of the image capturing device. When the specifications are
determined before shooting the image, the image may be shot by the
image capturing device under a condition most suitable for the
specifications. The display system may send information on the
display capacity thereof to the image capturing device, so that the
specifications may be determined by selecting it at an image
capturing device side. Conversely, the image capturing device may
send information on an image capturing capacity to the display
system, so that the specifications may be determined by selecting
it at a display system side. In this embodiment, too, an image
conforming to the display capacity of the display system is
transmitted from the image capturing device. Thus, a most
appropriate image can be displayed without manually setting the
resolution or file format of the image.
[0011] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: capturing an image of an object; transmitting the
captured image, upon the capturing, from an image capturing device
to an external display system via wireless communication; and
displaying the captured image almost simultaneously on both a
display unit built in the image capturing device and the display
system. According to this embodiment, the image shot by the image
capturing device is automatically transmitted to the display system
without going through a step where the transmission of the captured
image is manually instructed, and is immediately displayed. Thus,
an operator of an image capturing device, that is, a person who
photographs the image can easily and simply display on the display
system the image in the image capturing device without any
complicated operation. Furthermore, the display system can be used
in substitution for a display unit built in the image capturing
device, in which case the operationality thereof and the immediacy
of reproduction will be kept intact.
[0012] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the captured image via wireless
communication; and a display system which receives via wireless
communication the image transmitted from the image capturing device
and displays the received image. Moreover, upon the capturing of
the image, the captured image is displayed almost simultaneously on
both a display unit built in the image capturing device and the
display system. In this embodiment, too, the image shot is
automatically transmitted to the display system and instantaneously
displayed. Thus, the operationality thereof and the immediacy of
reproduction will be kept intact.
[0013] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: reading out by an image capturing device an image
specified to be displayed on a display unit built in the image
capturing device; transmitting the captured image, upon the reading
out, from the image shooting device to an external display system
via wireless communication; and displaying the display-specified
image almost simultaneously on both the display unit and the
display system. According to this embodiment, the images to be
reproduced at the display unit of the image capturing device are
automatically transmitted to the display system and displayed
without going through a step where the transmission of the captured
image is manually instructed, and are displayed instantaneously.
Thus, an operator of an image capturing device can easily and
simply display on the display system the image in the image
capturing device without any complicated operation. Furthermore,
the display system can be used in substitution for a display unit
built in the image capturing device, in which case the
operationality thereof and the immediacy of reproduction will be
kept intact.
[0014] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which reads out a
captured image and transmits the captured image via wireless
communication; and a display system which receives via wireless
communication the image transmitted from the image capturing device
and displays the received image. Moreover, upon readout of the
image, the read-out image is displayed almost simultaneously on
both a display unit built in the image capturing device and the
display system. In this embodiment, too, the images to be
reproduced at the display unit of the image capturing device are
automatically transmitted to the display system and displayed.
Thus, the image in the image capturing device can be simply
displayed on the display system, so that the operationality thereof
and the immediacy of reproduction can be kept intact.
[0015] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: recognizing a plurality of display systems capable of
carrying out wireless communication; selecting any of the plurality
of display systems as a transmission destination or transmission
destinations to which a captured image is transmitted via wireless
communication; and transmitting the captured image, upon the
capturing of the image, to the thus selected display system or
display systems via wireless communication. According to this
embodiment, a single unit of image capturing device can be
connected to a plurality of display systems, and the display
destination can be selected from among the plurality of display
systems. A plurality of image capturing devices can also be
connected to a plurality of display systems. Here, the "display
destination" means a display system to which the shot image is to
be transmitted. Thus, the combination of a single or plurality of
display systems and a single or a plurality of image capturing
devices enhances the flexibility of the image outputting system,
thus widening the range of usage thereof.
[0016] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the captured image via wireless
communication; and a plurality of display systems which receive via
wireless communication the image transmitted from the image
capturing device and display the received image. Moreover, prior to
transmission of the image, the image capturing device recognizes a
plurality of display systems as transmission destinations to which
a captured image is to be transmitted, selects any of the
recognized plurality of display systems and transmits the captured
image, upon the capturing of the image, to the thus selected
display system or display systems via wireless communication. For
example, the display system to which the shot image is to be
transmitted (hereinafter referred to as "display destination" also)
may be selected according to a resolution of an image shot, or
different display destinations may be selected for the respective
images at the time of continuous shots. In this embodiment, too, a
single unit of image capturing device can be selectively displayed
on a plurality of display systems, so that the display systems and
the image capturing device can be combined in a flexible
manner.
[0017] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: recognizing a plurality of image capturing devices
capable of carrying out wireless communication; selecting any of
the plurality of image capturing devices as a transmission source
or transmission sources from which a captured image is transmitted
via wireless communication; capturing an image or images of an
object by the selected image capturing device or devices; and
transmitting the captured image or images, upon the capturing of
the image or images, to a display system via wireless
communication. According to this embodiment, a plurality of image
capturing devices can be connected to a single unit of display
system, so that the image can be transmitted alternately from among
the respective image capturing devices to the display system under
certain rule and displayed. A plurality of image capturing devices
may also be connected to a plurality of display systems. Thus, the
combination of a single or plurality of display systems and a
single or a plurality of image capturing devices enhances the
flexibility of the image outputting system, thus widening the range
of usage thereof.
[0018] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: a plurality of image capturing devices which
capture images of an object and transmit the captured images via
wireless communication; and a display system which receives via
wireless communication the images transmitted from the plurality of
image capturing devices and displays the received images. Moreover,
prior to reception of the image, the display system recognizes a
plurality of image capturing devices as transmission sources from
which captured images are to be transmitted, selects any of the
recognized plurality of image capturing devices and receives the
captured image or images, upon the capturing of the image, from the
thus selected image capturing device or devices via wireless
communication. In this embodiment, too, a plurality of image
capturing devices are connected to a single unit of display system,
and the image can be alternately displayed on the respective image
capturing devices. Thus, the display systems and the image
capturing device can be combined in a flexible manner.
[0019] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: determining the permission or rejection of display of an
captured image based on a predetermined condition for permission,
prior to transmitting the captured image from an image capturing
device to a display system via wireless communication and
displaying the captured image on the display system; and displaying
on the display system the captured image a display of which is
permitted by the determining. The condition for permission may be
such that the permission or rejection of display may be determined
for each of the captured images or determined for each of image
capturing devices. According to this embodiment, the timing at
which the image is displayed or the object of an image can be
restricted. Thus, the object to be displayed which is transmitted
from the image capturing device side can be restricted or managed
at a display system side.
[0020] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the captured image via wireless
communication; and a display system which receives via wireless
communication the image transmitted from the image capturing device
and displays the received image. Moreover, the display system
determines whether the display of the transmitted image is
permitted or rejected based on a predetermined condition for
permission, and displays the transmitted image only if the display
thereof is permitted. A structure may be such that a decision on
permission or rejection of display is automatically made or that
the decision is manually made by an operator of the display system.
Moreover, the reception of an image may be permitted regardless of
the permission or rejection of display, or the reception of the
image may be rejected unless the display thereof is permitted. In
this embodiment, too, the object to be displayed on the display
system can be controlled at a display system side.
[0021] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: detecting information on connection status of wireless
communication between an image capturing device and a display
system; and displaying the information on connection status by at
least one of the image capturing device and the display system.
According to this embodiment, the status between the image
capturing device and the display system such as status of
establishing wireless communication, status of image transmission,
status of radio wave can be displayed on either the display system
or the image capturing device or on both the display system and the
image capturing device. Thus, a party with which the image
capturing device is communicating can be easily grasped regardless
of the communication status. Furthermore, the display system can be
utilized in substitution for a display unit built in the image
capturing device.
[0022] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the captured image via wireless
communication; and a display system which receives via wireless
communication the image transmitted from the image capturing device
and displays the received image. Moreover, at least one of the
image capturing device and the display system detects information
on connection status of wireless communication between the image
capturing device and the display system, and displays the
information on connection status. In this embodiment, too, the
communication status between the image capturing device and the
display system can be displayed on either the display system or the
image capturing device or on both the display system and the image
capturing device. Thus, the communication status can be easily
grasped.
[0023] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: determining whether displaying a captured image by a
display system is permitted or rejected wherein the captured image
is transmitted from an image capturing device to the display system
via wireless communication; and displaying information on whether
the displaying is permitted or rejected by the display system. The
permission or rejection of the displaying may be such that a
specific image capturing device is permitted or rejected or that
the displaying at a specific timing is permitted or rejected.
According to this embodiment, displayed is the status of
restriction imposed on the contents displayed by the display
system. Thus, objects the display of which is permitted by the
display system can be clarified, and the object to be displayed can
be easily grasped even from the image capturing device side.
[0024] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the captured image via wireless
communication; and a display system which receives via wireless
communication the image transmitted from the image capturing device
and displays the received image. Moreover, the display system
determines whether it is permitted or rejected to display the image
captured by the image capturing device on the display system, and
displays information on the thus determined permission or rejection
of the display thereof. In this embodiment, too, the status of
restriction imposed on the contents displayed by the display system
can be easily grasped.
[0025] Still another preferred embodiment according to the present
invention relates to a display control method. This method
includes: generating a settings image which visually represents
settings information necessary to establish wireless communication
between an image capturing device and a display system; displaying
the settings image; capturing an image of the displayed settings
image as an object; recognizing the settings information, based on
the captured image; and establishing wireless communication between
the image capturing device and the display system, based on the
recognized settings information. According to this embodiment, the
respective functions of both the image capturing device and the
display system are utilized to the full extent, thereby the
communication is automatically established without going through
any manual set-up operation. Thus, the image capturing device can
be easily connected with the display system in a simplified manner,
without going through any complicated set-up operation.
[0026] Still another preferred embodiment according to the present
invention relates to a captured image outputting system. This
system includes: an image capturing device which captures an image
of an object and transmits the captured image via wireless
communication; and a display system which receives via wireless
communication the image transmitted from the image capturing device
and displays the received image. Moreover, the display system
generates a settings image which visually represents settings
information necessary to establish wireless communication with the
image capturing device and displays the thus generated settings
image. The image capturing device shoots an image of the displayed
settings image as an object, recognizes the settings information
based on the shot image and establishes wireless communication with
the display system, based on the recognized settings information.
In this embodiment, too, the image capturing device can be
automatically connected with the display system without going
through any complicated set-up operation.
[0027] It is to be noted that any arbitrary combination of the
above-described structural components and expressions changed
between a method, an apparatus, a system, a computer program, a
recording medium having stored computer programs therein, a data
structure and so forth are all effective as and encompassed by the
present embodiments.
[0028] Moreover, this summary of the invention does not necessarily
describe all necessary features so that the invention may also be
sub-combination of these described features.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] FIG. 1 shows a basic structure of a captured image output
system 10.
[0030] FIG. 2 is a functional block diagram showing a basic
structure of a display control device.
[0031] FIG. 3 is a functional block diagram showing a basic
structure of an image capturing device.
[0032] FIG. 4 is a functional block diagram showing a detailed
structure of a control unit in a display control device.
[0033] FIG. 5 is a functional block diagram showing a detailed
structure of a control unit in an image capturing device.
[0034] FIG. 6 is a flowchart showing a process of transmitting a
captured image from an image capturing device to a display control
device.
[0035] FIG. 7 is a flowchart showing a process of transmitting a
captured image from an image capturing device to the display
control device.
[0036] FIGS. 8A to 8D show examples of connection between a display
system and an image capturing device in a captured image output
system.
[0037] FIG. 9 illustrates by example a screen on which a
transmission source of an image is selected.
[0038] FIG. 10 illustrates by example a screen on which a
transmission destination of an image is selected.
[0039] FIG. 11 shows a process in which images transmitted from
three image capturing devices are displayed in "first come, first
served" manner.
[0040] FIG. 12 shows display contents on a projected screen
projected by a display system.
[0041] FIG. 13 shows display contents on a display screen of an
image capturing device.
[0042] FIG. 14 shows an example of system configuration in which an
image capturing device and a display control device are connected
to each other via an access point.
DETAILED DESCRIPTION OF THE INVENTION
[0043] The invention will now be described based on the following
embodiments which do not intend to limit the scope of the present
invention but exemplify the invention. All of the features and the
combinations thereof described in the embodiments are not
necessarily essential to the invention. It is to be noted here that
in the patent specifications the terms "image capturing," and
"image shooting," as well as "a captured image," and "a shot image"
are used interchangeably.
[0044] FIG. 1 shows a basic structure of a captured image output
system 10. An image captured by an image capturing device 18 is
transmitted to a display control device 16 of a display system 12
via wireless communication 20. The display control device 16 inputs
the received image to a display device 14 of the display system 12.
The display device 14 projects the inputted image onto a screen. A
projected screen 22 instantaneously displays the image having been
captured just now by the image capturing device 18.
[0045] The image capturing device 18 is a digital still camera
equipped with a wireless LAN function, for instance. The wireless
communication 20 may include such communication modes as wireless
LAN communication of mainly IEEE802.11a/b/g or Bluetooth
(trademark). The display system 12 is comprised of a display device
14 and a display control device 16. A liquid crystal projector is
used herein as an example of the display device 14, but a
television set may be used instead. The display control device 16
is, for instance, a device provided with a wireless LAN function
and an image signal conversion function and is an optional device
to be connected to an image input terminal of a liquid crystal
projector. It is to be noted here that the display system 12 may be
constituted by building the display control device 16 into the
display device 14.
[0046] In terms of hardware, the structure of the image capturing
device 18 and the display control device 16 may be realized by a
CPU, memory, communication module or other LSIs. In terms of
software, it may be realized by memory-loaded programs having a
data transmission/reception function, image processing function or
the like, but drawn in FIGS. 2 to 14 and described here are
function blocks that are realized in cooperation with those. Thus,
it is understood by those skilled in the art that these function
blocks can be realized in a variety of forms by hardware only,
software only or the combination thereof.
[0047] FIG. 2 is a functional block diagram showing a basic
structure of a display control device 16. The display control
device 16 includes a communication unit 50, a buffer memory 52, a
control unit 54, an image processing unit 56, an output unit 58 and
an operation unit 60. Each of these units communicates with an
external source via the communication unit 50. The communication
unit 50 receives images from the image capturing device 18 and
stores the images in the buffer memory 52. The buffer memory 52 is
a RAM that stores temporarily data of still pictures or moving
pictures that are compressed in a JPEG or MPEG format. The image
processing unit 56 reads out an image from the buffer memory 52 and
generates image data by carrying out such processing as decoding
and image signal conversion. The output unit 58 outputs the image
data generated by the image processing unit 56 to the image input
terminal of the display device 14. The control unit 54 controls the
operation of such units as the communication unit 50 and the image
processing unit 56. The operation unit 60 is operated by a user and
sends instructions according to the operation to the control unit
54.
[0048] FIG. 3 is a functional block diagram showing a basic
structure of an image capturing device 18. The image capturing
device 18 includes a lens 30, a CCD 32, an image processing unit
34, a buffer memory 36, a display unit 38, a control unit 40, a
communication unit 42 and an operation unit 44. The lens 30 takes
in a light flux originating from an object and forms an image
therefrom, and the CCD 32 converts the formed image into an
electrical signal. The image processing unit 34 A/D converts the
electrical signal and then compresses this converted signal before
storing it in the buffer memory 36. The buffer memory 36 is a RAM
that stores temporarily data of still pictures or moving pictures
that are compressed in JPEG or MPEG format. The display unit 38
displays an image stored in the buffer memory 36 on the screen
thereof. The communication unit 42 transmits the image to the
display control device 16 via wireless communication. Each of these
units communicates with an external source via the communication
unit 42. The control unit 40 controls the operation of such units
as the CCD 32, the display unit 38 and the communication unit 42.
The operation unit 44 receives signals of operation from a user and
sends instructions according to the operation to the control unit
40.
[0049] FIG. 4 is a functional block diagram showing a detailed
structure of a control unit 54 of a display control device 16. The
control unit 54 includes a specification setting unit 90, a
reproduction control unit 92, an object setting unit 94, a
communication setting unit 96, a status display unit 98 and an
image settings generator 99. The specification setting unit 90
determines the specifications for an image to be received from the
image capturing device 18, and the reproduction control unit 92
controls the output of an image to the display device 14. The
object setting unit 96 sets the object of an image to be displayed
by the display system 12, and the communication setting unit 96
controls the wireless communication with the image capturing device
18. The status display unit 98 outputs various information,
including the state of communication, to the display device 14, and
the image settings generator 99 outputs information necessary for
the image capturing device 18 to establish wireless communication
with the display control device 16. The detailed functions of the
above-described structures will be described later.
[0050] FIG. 5 is a functional block diagram showing a detailed
structure of a control unit 40 of an image capturing device 18. The
control unit 40 includes a specification setting unit 70, a
transfer processing unit 72, a reproduction control unit 74, an
image capturing control unit 76, a communication setting unit 78, a
status display unit 80 and a settings recognition unit 82. The
specification setting unit 70 determines the specifications for an
image to be transmitted to the display control device 16, and the
transfer processing unit 72 controls the transmission of an image
to the display control device 16. The reproduction control unit 74
controls the reproduction of an image by the display unit 38, and
the image capturing control unit 76 controls the image capturing by
the CCD 32. The communication setting unit 78 sets information
necessary for establishing wireless communication with the display
control device 16, and the status display unit 80 displays various
information, including the state of communication, on the display
unit 38. The detailed functions of the components of the
above-described structure will be described later.
[0051] Hereinbelow, the representative functions of a captured
image output system 10 will be explained one by one.
[0052] The first of the functions is a function of selecting the
specifications for an image to be displayed. The specification
setting unit 90 shown in FIG. 4 stores the display capacity of the
display system 12 in advance. The display capacity is denoted by a
resolution, such as VGA, XGA or SXGA, or by a file format, such as
JPEG or TIFF, for instance. The specification setting unit 90
transmits to the image capturing device 18 data on the display
capacity of the display system 12 as the specifications for an
image that can be displayed by the display system 12. The
specification setting unit 70 shown in FIG. 5 acquires data on the
specifications for the image from the specification setting unit 90
shown in FIG. 4. The specification setting unit 70 stores the image
capturing capacity of the image capturing device 18 in advance. The
image capturing capacity is denoted by a resolution of an image
that can be captured or by a file format, such as JPEG or TIFF, for
instance. The specification setting unit 70 compares the display
capacity acquired from the specification setting unit 90 with the
image capturing capacity of the image capturing device 18, and
selects appropriate capacity specifications. For example, if there
is any common item of specifications in the resolution or file
format, the common specification is selected, but if there is not,
the image is converted in such a way as to conform to the display
capacity. Where there are a plurality of common specifications, one
with higher image quality may be chosen. This selection and
adjustment of capacity specifications may be done in relation to
the display system 12 at the time of power-on of the image
capturing device 18.
[0053] FIG. 6 is a flowchart showing the process of transmitting a
captured image from an image capturing device 18 to a display
control device 16. The image capturing device 18 captures an image
(S10) and sends a permission request for transmission of the
captured image to a display control device 16 (S12). In response to
this request, the display control device 16 sends a permission
notice and specifications for a displayable image to the image
capturing device 18 (S14). The image capturing device 18 determines
the specifications for an image to be transmitted to the display
control device 16 according to its image capturing capacity (S16)
and converts the image as necessary (S18). The image capturing
device 18 transmits the image to the display control device 16
(S20), and the display control device 16 returns an ACK
(acknowledgement) response to the image capturing device 18 (S22),
thus completing the transfer of an image. The process subsequent to
the step S22 will be described later.
[0054] The second of the functions is a function of the display
unit 38 of the image capturing device 18 and the display control
device 16 simultaneously displaying a captured image immediately
after the capturing thereof. When an image is captured under the
control of the image capturing control unit 76 shown in FIG. 5, the
transfer processing unit 72, upon capturing of the image, carries
out a control to immediately transmit the captured image to the
display control device 16. When the image transmission to the
display control device 16 is completed, the reproduction control
unit 74 instructs the display unit 38 to display the image. The
reproduction control unit 92 shown in FIG. 4 carries out a control
to immediately output the image received from the image capturing
device 18 to the display device 14. As a result, the captured image
is displayed almost simultaneously on the display unit 38 and the
display system 12 even without any instructions given by the user
of the image capturing device 18.
[0055] Referring back to FIG. 6, after the image is transmitted
from the image capturing device 18 to the display control device 16
through the process of S10 to S22 as described above, the display
unit 38 of the image capturing device 18 and the display system 12
display the same image almost simultaneously (S26, S28).
[0056] The third of the functions is a function of simultaneously
displaying the image reproduced by the display unit 38 of the image
capturing device 18 on the display system 12 also. When a
reproduction of an image is instructed by the user of the image
capturing device 18 via the operation unit 44, the reproduction
control unit 74 shown in FIG. 5 controls the processing to read out
the image to be reproduced. The readout destination is the buffer
memory 36 or an external server. When the image stored in the
external server is to be reproduced, the image is received by the
communication unit 42. The transfer processing unit 72, upon the
readout of the image, carries out a control to immediately transmit
the read-out image to the display control device 16. When the image
transmission to the display control device 16 is completed, the
reproduction control unit 74 instructs the display unit 38 to
display the image. The reproduction control unit 92 shown in FIG. 4
carries out a control to immediately output the image received from
the image capturing device 18 to the display device 14. As a
result, the image to be reproduced is displayed almost
simultaneously on the display unit 38 and the display system 12
even without any instructions given by the user of the image
capturing device 18.
[0057] FIG. 7 is a flowchart showing the process of transmitting
the captured image from the image capturing device 18 to the
display control device 16. The image capturing device 18 reads out
an image to be reproduced (S50) and sends a permission request for
transmission of the read-out image to the display control device 16
(S51). In response to this request, the display control device 16
sends a permission notice and specifications for a displayable
image to the image capturing device 18 (S52). The image capturing
device 18 determines the specifications for an image to be
transmitted to the display control device 16 according to the image
to be reproduced (S54) and converts the image as necessary (S56).
The image capturing device 18 transmits the image to the display
control device 16 (S58), and the display control device 16 returns
an ACK response to the image capturing device 18 (S60). Then the
image capturing device 18 and the display system 12 display the
image almost simultaneously (S64, S66).
[0058] The fourth of the functions is a function for connecting a
plurality of image capturing devices 18 with a plurality of display
systems 12 in various combinations. If a plurality of units are
denoted by n, the image capturing devices 18 and the display
systems 12 may be combined in the ratio 1 to 1, 1 to n, n to 1 or n
to n.
[0059] FIGS. 8A to 8D show examples of connection between the
display system 12 and the image capturing device 18 in a captured
image output system 10. FIG. 8A shows a minimum unit of
combination, in which the image capturing devices 18 and the
display systems 12 are connected to each other in the ratio 1 to 1.
In this case, each of the above-mentioned units has only one party
to communicate with, so that the object setting unit 94 in FIG. 4
and the transfer processing unit 72 in FIG. 5, for instance, have
no need to carry out processing to select a destination or a source
of transmission.
[0060] FIG. 8B shows a combination, in which the display system 12
is connected to the image capturing devices 18 in the ratio 1 to n.
For example, a case of application in school may be assumed in
which one display system 12 is installed in a classroom and a
plurality of image capturing devices 18 are assigned to students.
The object setting unit 94 shown in FIG. 4 recognizes the plurality
of image capturing devices 18 by referring to information inherent
thereto, such as their IP addresses or MAC addresses, and selects
manually or automatically one of the plurality of image capturing
devices 18 as the source of transmission of an image. As
information on the general structure of the captured image output
system 10, a predetermined supervisor may prepare a correspondence
table of the names of users of the image capturing devices 18 and
their IP addresses or MAC addresses beforehand. The correspondence
table may be stored on a predetermined server and it may be
acquired as the occasion demands by the object setting unit. 94. Or
some recording medium, such as a memory card storing the
correspondence table, may be provided to each user, and the
correspondence table may be read in by the object setting unit
94.
[0061] FIG. 8C shows a combination, in which the display systems 12
are connected to the image capturing device 18 in the ratio n to 1.
Examples of assumed applications may include a structure in which a
plurality of display systems 12 are installed and, when images are
captured in succession by the image capturing device 18, the images
are displayed one by one by different display systems 12, and a
structure in which a plurality of images are displayed by different
display systems 12 according to the resolution thereof. The
transfer processing unit 72 shown in FIG. 5 recognizes the
plurality of display systems 12 by referring to information
inherent thereto, such as their IP addresses or MAC addresses, and
selects manually or automatically one of the plurality of display
systems 12 as the destination of transmission of an image. The
general structure of the captured image output system 10 may be
managed by a correspondence table, and the correspondence table may
be acquired by the transfer processing unit 72.
[0062] FIG. 8D shows a combination, in which the display systems 12
are connected to the image capturing devices 18 in the ratio n to
n. This is a combination of FIG. 8B and FIG. 8C. For example, a
case of application in a school as a whole may be assumed such that
one display system 12 is installed in each of a plurality of
classrooms and a plurality of image capturing devices 18 assigned
to a plurality of students from each of the plurality of classrooms
are connected thereto. Another case may be assumed such that a
plurality of display systems 12 are installed and a plurality of
image capturing devices 18 are allowed to transmit images, which
are displayed by separate units of the display systems 12 in a
"first come, first served" manner. Between the plurality of display
systems 12 and the plurality of image capturing devices 18, a party
to which an image is to be transmitted or a party from which an
image is to be received may be selected manually or
automatically.
[0063] FIG. 9 illustrates by example a screen on which a
transmission source of an image can be selected. FIG. 9 represents
a projected screen 22 projected on a screen by a display device 14,
in which displayed are a list of device numbers for a plurality of
image capturing devices 18 and a list of names of users thereof. A
correspondence table of device numbers and user names may be
prepared in advance by a manager of the captured image output
system 10. A system number 103 indicating this display system 12 is
displayed in a corner of the projected screen 22. The user
operating the display system 12 can select from the list a user
name to whom he/she gives a permission for an image transmission,
by moving the cursor 112 up or down. According to user instructions
like this, the object setting unit 94 of FIG. 4 selects a
transmission source of an image and controls in such a manner that
the image received from the transmission source is outputted to the
display device 14. The object setting unit 94 may perform such a
setting as to reject all the display of images by selecting none of
the image capturing devices 18. The setting of acceptance or
rejection of display to be determined by the selection as mentioned
above is stored in the object setting unit 94 as a condition for
permission.
[0064] FIG. 10 illustrates by example a screen on which a
transmission destination of an image can be selected. FIG. 10
represents a display screen 106 displayed by the display unit 38 of
an image capturing device 18, in which a list of system numbers for
a plurality of display systems 12 are displayed. The system numbers
may be assigned to a plurality of display systems 12 in advance by
a manager of this system. A device number 111 indicating this image
capturing device 18 is displayed in a corner of the display screen
106. The user operating the image capturing device 18 can select
from the list an image transmission destination, that is, a system
number of the display system 12 on which he/she desires to have the
image displayed, by moving the cursor 107 up or down. According to
user instructions like this, the transfer processing unit 72 of
FIG. 5 selects a transmission destination of an image and controls
in such a manner that the image is transmitted to the display
device 14, which is the transmission destination.
[0065] The fifth of the functions is a function for having an image
permitted under a specific condition for permission displayed on
the display system 12 by rejecting the display of the other images.
The object setting unit 94 shown in FIG. 4 judges whether to accept
or reject the display of each image according to a specific
condition for permission. The specific conditions for permission
may be decided in various ways as rules for accepting or rejecting
each of the images. For example, the conditions for permission may
be so set that for a predetermined period of time after an image is
received and displayed by the display system 12, the display of
subsequent images is rejected even when they are transmitted from
the same image capturing device 18. As shown in FIG. 6, after a
permission notice is transmitted from the display control device 16
to the image capturing device 18 (S14), a receiving mode, in which
an image reception is awaited, is started (S17). An image is
received (S20), and after the received image is displayed (S28),
the receiving mode comes to an end (S30). Thereafter, even when the
same image capturing device 18 captures a new image (S32) and
transmits a permission request for an image transmission to the
display control device 16 (S34), the display control device 16
responds to it with a rejection notice to the image capturing
device 18 (S36). At this time, whereas the image capturing device
18 has the display unit 38 display the captured image (S38), the
display control device 16 has the display device 14 display the
status indicating the completion of the receiving mode (S40).
[0066] As an example of other conditions for permission, the
condition may be so set that images to be displayed are determined
on a "first come, first served" basis. In other words, this is a
system wherein after the display control device 16 has entered the
receiving mode, in which an image reception is awaited, only the
image transmitted thereto first is displayed. Moreover, the
condition for permission may be further established that the
display of not only the image transmitted first but also the images
subsequently transmitted from the same image capturing device 18 is
permitted.
[0067] FIG. 11 shows the process in which images transmitted from
three image capturing devices 18 are displayed in "first come,
first served" manner. The three image capturing devices 18 are
called camera D1, camera D2 and camera D3, respectively. First, the
camera D1 captures an image (S70) and transmits a permission
request for an image transmission to the display control device 16
(S72). To this, the display control device 16 responds with a
permission notice and specifications for an image to be displayed
(S74). The display control device 16 starts the receiving mode for
camera D1 only (S77), and even when the camera D3 captures an image
about this time (S92) and then transmits a permission request for
an image transmission to the display control device 16 (S94), the
display control device 16 responds to the permission request with a
rejection notice (S96).
[0068] The camera D1, which has received a permission notice,
determines specifications for the image (S76), converts the image
as necessary (S78) and transmits the image conforming to the
specifications to the display control device 16 (S80). To this, the
display control device 16 sends an acknowledgement (ACK) response
(S82). The camera D1 and the display system 12 display the image
captured by camera D1 almost simultaneously (S86, S88), and the
display control device 16 completes the receiving mode (S90). After
this, even when the camera D2 captures an image (S100) and
transmits a permission request for an image transmission to the
display control device 16 (S102), the display control device 16
responds to the permission request with a rejection notice
(S104).
[0069] As an example of other conditions for permission, the
condition may be so set that, as described along with FIG. 9, the
user operating the display system 12 selects manually a specific
image capturing device 18 to which the display is permitted.
[0070] The sixth of the functions is a function for displaying the
connection status of communication between the image capturing
device 18 and the display control device 16. FIG. 12 shows display
contents on a projected screen 22 projected by a display system 12.
The projected screen 22 displays a connection status 104. The
connection status 104 illustrated here is the characters
"TRANSMITTING" which indicates that an image capturing device 18 is
now transmitting an image to a display device 14. Another example
of connection status 104 may be "ERROR" which indicates a
disconnection of communication or a failure of image transmission.
A still another example is "RECEIVED 104 KB" which may indicate a
success in an image reception and the image size received.
[0071] FIG. 13 shows display contents on a display screen 106 of an
image capturing device 18. The display screen 106 also displays a
connection status 110. The connection status 110 illustrated here
is the characters "WITHIN RANGE" which indicates that an image
capturing device 18 is now within range of wireless communication.
When the image capturing device 18 is out of the range, the
characters "OUTSIDE RANGE" is displayed as the connection status
110 on the display screen 106. The characters "TRANSMITTING,"
"ERROR," "RECEIVED 104KB" and the like, such as those displayed on
the projected screen of FIG. 12, may be displayed as connection
status on the display screen 106. These display contents may be
displayed simultaneously on both the display screen 106 and
projected screen 22. This arrangement may allow the user to check
on the connection status by seeing whichever of the display screen
106 and the projected screen 22.
[0072] The seventh of the functions is a function for displaying
the permission or rejection of an image display for the image
capturing device 18. Displayed on the projected screen 22 as shown
in FIG. 12 are a permitted user name 100, which shows a user
permitted to display an image, and a permission display 102. For
example, in a system configuration wherein a plurality of image
capturing devices 18 are connected to a single display system 12,
the user of each image capturing device 18 can see who among the
users is now permitted to display his/her image by taking a look at
the display of permission or rejection on the projected screen 22.
On the display screen 106 as shown in FIG. 13, the characters
"PERMITTED" or "REJECTED" are displayed as display permit/reject
indication 108, so that the user operating the image capturing
device 18 can see whether he/she is now permitted to display
his/her image or not by taking a look at the display screen
106.
[0073] The eighth of the functions is a function for automatically
setting information necessary to establish wireless communication
between the image capturing device 18 and the display control
device 16. The communication setting unit 96 shown in FIG. 4 holds
settings information necessary for the image capturing device 18 to
establish wireless communication with the display device 14. The
settings information may, for instance, be a MAC address, which is
a hardware address inherent to the display device 14 as the minimum
information, or may further include such other information as
ESS-ID, WEP password and IP address that are necessary for setting
a wireless LAN. The settings image generator 99 generates a
settings image representing the settings information visually. For
example, it may generate an image of a two-dimensional bar code
showing a MAC address graphically or may generate an image simply
displaying a character string for a MAC address. The settings image
generator 99 outputs a settings image thus generated to the display
device 14 and has the display device 14 display it on the projected
screen 22. The image capturing device 18 captures the settings
image displayed, and the settings recognition unit 82 shown in FIG.
5 reads the image and recognizes the settings information. Where a
settings image displays a character string, the settings
recognition unit 82 recognizes the settings information by
character recognition. The communication setting unit 78
establishes communication with the display device 14 by using the
settings information. As a method for establishing communication,
communication for a minimum information exchange may first be
secured by the use of a MAC address and then necessary settings
information may further be exchanged to establish communication
capable of an image transmission.
[0074] Using this function, it is possible to make a setting for
wireless communication without manually inputting information to
the image capturing device 18. Normally, an image capturing device
18 is not provided with information input interface for inputting
characters or numbers, which has nothing to do with its intended
purpose of image capturing. With this function equipped, therefore,
the interface of the image capturing device 18 can be simplified
without newly installing such user interface.
[0075] FIG. 14 shows an example of system configuration in which an
image capturing device 18 and a display control device 16 are
connected to each other via an access point 28. Whereas FIG. 1
shows a case of connection between an image capturing device 18 and
a display control device 16 in an ad hoc mode, FIG. 14 shows a case
of connection in an infrastructure mode. Each of the image
capturing device 18 and the display control device 16 establishes
wireless communication with the access point 28, and the image
capturing device 18 transmits an image to the display control
device 16 via the access point 28. The access point 28 is connected
to an image server 26 via a network 24, and the image capturing
device 18 transfers a captured image to the image server 26 through
the access point 28 and the network 24 and stores the captured
image in a predetermined area of the image server 26. For the
reproduction of the captured image, it is received when necessary
from the image server 26 via the access point 28.
[0076] The wireless communication via an access point 28 as shown
in FIG. 14 is particularly preferable for its simplicity of
communication setting or communication control when the image
capturing device 18 and the display control device 16 are connected
with each other in the ratio 1:n, n:1 or n:n. Furthermore, since an
image captured by the image capturing device 18 is stored in the
image server 26, the display control device 16 may request to
receive the image to be displayed from the image server 26, instead
of the image capturing device 18 transmitting the image to be
displayed by the display system 12. Moreover, the area where images
are stored is not limited to the image server 26. Captured images
may be stored in the image capturing device 18 or the display
control device 16, and in such a case, information on which area
stores such images is held by the image capturing device 18 or the
display control device 16. As a result, the user can handle images
without being conscious of where the images are stored.
[0077] The present invention has been described based on the
embodiments which are only exemplary. It is understood by those
skilled in the art that there exist other various modifications to
the combination of each component and process described above and
that such modifications are encompassed by the scope of the present
invention.
[0078] By the sixth function of the present embodiments,
information on connection status is displayed on both the projected
screen 22 projected by the display system 12 and the display screen
106 of the image capturing device 18. In this case, the connection
status displayed on the projected screen 22 and the connection
status displayed on the display screen 106 may be either a
different type or the same type of information. In a modified
example, there may not only be an agreement in the type of
connection status between the projected screen 22 and the display
screen 106, but the arrangement may also be such that both the
screens display the same image, thus achieving a nearly complete
agreement in the screen contents. This structure therefore provides
greater convenience to the user, who can check on the same contents
by looking at whichever of the display screen 106 and the projected
screen 22.
[0079] Although the present invention has been described by way of
exemplary embodiments, it should be understood that many changes
and substitutions may further be made by those skilled in the art
without departing from the scope of the present invention which is
defined by the appended claims.
* * * * *