U.S. patent application number 14/585834 was filed with the patent office on 2015-04-23 for zoom processing device, zoom processing method, and computer program.
This patent application is currently assigned to NEC Corporation. The applicant listed for this patent is Hiroshi Maesaka. Invention is credited to Hiroshi Maesaka.
Application Number | 20150109343 14/585834 |
Document ID | / |
Family ID | 44595404 |
Filed Date | 2015-04-23 |
United States Patent
Application |
20150109343 |
Kind Code |
A1 |
Maesaka; Hiroshi |
April 23, 2015 |
ZOOM PROCESSING DEVICE, ZOOM PROCESSING METHOD, AND COMPUTER
PROGRAM
Abstract
Provided is a new framework to perform zoom processing of a
screen displayed on a display by unit of a simple operation. A zoom
processing device of this invention, includes: calculates a
movement amount of a pointer which is selecting an object on the
screen; and performs enlarged display of the screen including the
object at a first magnification when, as a result of the
calculation, the movement amount of the pointer is equal to or less
than a threshold value, and performs reduced display of the screen
including the object at a second magnification when, as a result of
the calculation, the movement amount of the pointer is greater than
a threshold value.
Inventors: |
Maesaka; Hiroshi; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Maesaka; Hiroshi |
Tokyo |
|
JP |
|
|
Assignee: |
NEC Corporation
Tokyo
JP
|
Family ID: |
44595404 |
Appl. No.: |
14/585834 |
Filed: |
December 30, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13015283 |
Jan 27, 2011 |
8952992 |
|
|
14585834 |
|
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|
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Current U.S.
Class: |
345/660 |
Current CPC
Class: |
G09G 5/373 20130101;
G09G 2340/045 20130101; G06F 3/0481 20130101; G06F 2203/04806
20130101 |
Class at
Publication: |
345/660 |
International
Class: |
G09G 5/373 20060101
G09G005/373 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 5, 2010 |
JP |
2010-024380 |
Claims
1. A zoom processing device, comprising: a scrolling amount
calculation unit for calculating a screen scrolling amount; and a
zoom control unit for performing enlarged display of the screen at
a first magnification when, as a result of the calculation, the
scrolling amount is equal to or less than a threshold value, and
for performing reduced display of the screen at a second
magnification when, as a result of the calculation, the scrolling
amount is greater than a threshold value, wherein the scrolling
amount calculation unit calculates the screen scrolling amount in a
unit time, and when screen scrolling amounts in a unit time
calculated at the calculation time and at an immediately preceding
calculation time are equal to or less than a threshold value, the
zoom control unit updates the first magnification to a larger
magnification, and performs enlarged display of the screen at the
updated first magnification, and when screen scrolling amounts in a
unit time calculated at the calculation time and at an immediately
preceding calculation time are greater than a threshold value, the
zoom control unit updates the second magnification to a smaller
magnification, and performs reduced display of the screen at the
updated second magnification.
Description
CROSS-REFERENCES
[0001] The present application is a continuation application of
U.S. patent application Ser. No. 13/015,283 filed on Jan. 27, 2011,
which claims the benefit of priority from Japanese Patent
Application 2010-024380 filed on Feb. 5, 2010, the disclosures of
all of which are incorporated in their entirety by reference
herein.
TECHNICAL FIELD
[0002] This invention relates to technology for enlarged display or
reduced display of a screen.
BACKGROUND ART
[0003] Heretofore, GUIs provided with rich operability have not
been limited to personal computers, but have spread to portable
telephones and other devices, and this has been accompanied by the
widespread provision, in information processing terminals, of
pointing devices (mice and similar) to control screen display
scroll processing, zoom processing, and similar.
[0004] For example, in Patent Reference 1 below, technology is
disclosed for executing scrolling or zooming in proportion to the
distance moved by a pointing device with respect to the working
display.
[0005] Patent Reference 1: Japanese Translation of PCT Application
No. 2008-529153
SUMMARY
[0006] An exemplary object of the invention is to provide a zoom
processing device, a zoom processing method and a computer program
that can perform zoom processing of a screen displayed on a display
by a simple operation.
[0007] A first zoom processing device according to an exemplary
aspect of the present invention, includes: a pointer movement
amount calculation unit for calculating a movement amount of a
pointer which is selecting an object on a screen; and a zoom
control unit for performing enlarged display of a screen including
the object at a first magnification when, as a result of the
calculation, the movement amount of the pointer is equal to or less
than a threshold value, and for performing reduced display of a
screen including the object at a second magnification when, as a
result of the calculation, the movement amount of the pointer is
greater than a threshold value.
[0008] A second zoom processing device according to an exemplary
aspect of the present invention includes: a scrolling amount
calculation unit for calculating a screen scrolling amount; and a
zoom control unit for performing enlarged display of the screen at
a third magnification when, as a result of the calculation, the
scrolling amount is equal to or less than a threshold value, and
for performing reduced display of the screen at a fourth
magnification when, as a result of the calculation, the scrolling
amount is greater than a threshold value.
[0009] A zoom processing method according to an exemplary aspect of
the present invention, includes: calculating a movement amount of a
pointer which is selecting an object on a screen; and performing
enlarged display of a screen including the object at a first
magnification when, as a result of the calculation, the movement
amount of the pointer is equal to or less than a threshold value,
and performing reduced display of a screen including the object at
a second magnification when, as a result of the calculation, the
movement amount of the pointer is greater than a threshold
value.
[0010] A computer program according to an exemplary aspect of this
invention is a computer program causing an information processing
device to execute the above zoom processing method.
[0011] In this invention, "means" does not mean simply physical
means, but also includes cases in which the functions of the means
are realized by software. Further, the functions of one means or
device may be realized by two or more physical means or devices,
and the functions of two or more means or devices may be realized
by one physical means or device.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 shows the configuration of the zoom processing device
of a first exemplary embodiment;
[0013] FIG. 2 is a flowchart of zoom processing by a zoom
processing device;
[0014] FIG. 3 shows a state in which a pointer moves on a screen
with an object selected;
[0015] FIG. 4 shows a state in which, over a unit time (dt), a
pointer moves on a screen with an object selected;
[0016] FIG. 5 shows an example in which a zoom processing device is
used as an application server; and
[0017] FIG. 6 shows another configuration of a zoom processing
device.
EXEMPLARY EMBODIMENT
[0018] Below, a framework for enlarged display or reduced display
of a screen on a display through operation of a pointing device is
explained, referring to the drawings, as an exemplary embodiment of
the invention.
[0019] FIG. 1 shows the configuration of the zoom processing device
100 of a first exemplary embodiment.
[0020] The zoom processing device 100 is configured using an
ordinary personal computer comprising a hard disk (HDD), RAM, ROM,
CPU, and communication device; a mouse 110 as a pointing device,
and a display 120 are connected.
[0021] Also comprised are an application execution unit 130, in
which is functionally realized a prescribed application program,
stored for example on the HDD, by reading to RAM and execution by
the CPU, as well as a zoom processing unit 140 in which is
functionally realized a prescribed computer program stored on the
HDD to realize the characteristic functions of this invention by
reading into RAM and executing by the CPU. As the application
program, an arbitrary application program can be used, such as an
Internet browser, document creation software, spreadsheet software,
presentation slide creation software, image editing software, map
information display software, and similar.
[0022] The zoom processing unit 140 of the zoom processing device
100 performs reduction or enlargement of a screen displayed on the
display 120 as the result of computations by the application
execution unit 130, based on operation of the mouse 110 by the
user. Further, the zoom processing unit 140 comprises, as
functional means to realize this function, mouse movement amount
acquisition unit 150, pointer movement amount calculation unit 160,
and zoom control unit 170. Below, each of these function unit is
explained.
[0023] The application execution unit 130 realizes the functions of
the application program being executed, and displays computation
results on the display 120.
[0024] The mouse movement amount acquisition unit 150 acquires from
the mouse 110 information indicating the movement amount of the
mouse 110, as well as information indicating whether a button
included in the mouse 110 is being clicked, and similar. As
information indicating the movement amount of the mouse 110, for
example information indicating the movement amount in the
horizontal direction (X direction) and the movement amount in the
vertical direction (Y direction), taking for example as reference a
prescribed direction.
[0025] The pointer movement amount calculation unit 160 calculates
the movement amount of the pointer selecting the object on the
screen displayed on the display 120 based on the movement amount of
the mouse 110. More specifically, based on the movement amount of
the mouse 110, the distance (|T-S|) between a first coordinate S
and second coordinate T of the pointer is determined as the
movement amount per unit time (unit movement amount) of the pointer
selecting the object. As the units of the unit movement amount, mm,
pt, inches, or another arbitrary length unit which can be processed
by a computer, can be used. An object is an arbitrary object which
exists on a screen displayed on a display 120 by the application
execution unit 130, and which can be selected and moved ("dragged")
according to an operation of the mouse 110. For example, a
background image, graphic, text box, scrollbar, or scroll button,
or similar can be an object.
[0026] The zoom control unit 170 performs enlarged display or
reduced display, at a prescribed magnification, of the screen
including the object displayed on the display 120, based on whether
the pointer movement amount determined by the pointer movement
amount calculation unit 160 is greater than a threshold value. More
specifically, when as a result of calculation of the unit movement
amount by the pointer movement amount calculation unit 160, the
unit movement amount is equal to or less than a prescribed
threshold value, enlarged display of the screen including the
object at a first magnification ".alpha..sup.m" (where .alpha.>1
and m is a positive integer) is performed, and when the pointer
unit movement amount is greater than a prescribed threshold value,
reduced display of the screen including the object at a second
magnification ".beta..sup.n" (where 1>.beta.>0 and n is a
positive integer) is performed.
[0027] Further, when the unit movement amount is equal to or below
a threshold value from the time of new calculation of a pointer
unit movement amount to the time of the immediately preceding
calculation by the pointer movement amount calculation unit 160
(consecutive unit times (2dt)), the zoom control unit 170 updates
the first magnification to a higher magnification, and performs
enlarged display at the updated first magnification of the screen
including the object being selected by the pointer.
[0028] On the other hand, when the unit movement amount is greater
than a threshold value from the time of new calculation of a
pointer unit movement amount to the time of the immediately
preceding calculation by the pointer movement amount calculation
unit 160 (at each of the consecutive unit times (2dt)), the second
magnification is updated to a lower magnification, and reduced
display is performed at the updated second magnification of the
screen including the object being selected by the pointer. The
method of updating the magnification of enlargement or reduction is
explained below referring to FIG. 2.
[0029] FIG. 2 is a flowchart showing the flow of zoom processing by
the zoom processing device 100. Below, details of this processing
are explained referring to FIG. 2 and similar. In this
Specification, the processes described in this flowchart and
similar (including partial processes not assigned a symbol) can be
changed in order arbitrarily, or executed in parallel, so long as
no contradiction arises in the processing details.
[0030] In the first exemplary embodiment, as shown in FIG. 3, a
case is supposed in which the user operates the mouse 110 on an
image editing screen 300 displayed on the display 120 by the
application execution unit 130, in a state in which some object
(not shown) is selected by the pointer 310, to move (drag) from a
starting point S to an end point T. Dragging is taken to include
not only cases in which the pointer 310 is moved in a state in
which some object is selected, but also cases in which the pointer
310 is stopped in a state in which some object is selected.
Further, it is supposed that the threshold value for the unit
movement amount of the pointer 310 which is used as a judgment
criterion by the zoom control unit 170 for whether to perform
enlarged display or reduced display of the image editing screen 300
is set to 0. That is, in the first exemplary embodiment, whether
the pointer 310 has been moved in a unit of time (dt) is taken to
be a criterion for selecting either enlarged display or reduced
display. The threshold value for the unit movement amount of the
pointer 310 may be set to a value larger than 0.
[0031] First, with the condition that the pointer 310 is selecting
an object (when the judgment in S201 is Yes), the mouse movement
amount acquisition unit 150 of the zoom processing device 100
calculates the first coordinates S (x.sub.s, y.sub.s) of the
pointer 310, as shown in FIG. 4, based on information acquired from
the mouse 110 (S202). In cases in which the pointer 310 is not
selecting an object (when the judgment in S201 is No), processing
waits until selection of an object by the pointer 310 begins.
[0032] And, with the condition that unit time (dt) has elapsed in
the state in which the pointer 310 selects the object (when the
judgment in S203 is Yes), the second coordinates T (x.sub.t,
y.sub.t) of the pointer 310 are calculated, as shown in FIG. 4,
based on information acquired from the mouse 110 (S204). In the
first exemplary embodiment, the unit time (dt) is for example 1
second. In a case in which after the unit time (dt) has elapsed,
selection of the object by the pointer 310 has been canceled (when
the judgment in S203 is No), processing returns to S201.
[0033] Next, the pointer movement amount calculation unit 160 of
the zoom processing device 100 calculates the unit movement amount
(|T-S|) of the pointer 310, that is, the movement amount (|T-S|) of
the pointer 310 for every unit time (dt) (S205).
[0034] Specifically, the unit movement amount (|T-S|) is the
distance between the first coordinates S (x.sub.s, y.sub.s) and the
second coordinates T (x.sub.t, y.sub.t) of the pointer calculated
by the mouse movement amount acquisition unit 150, and so can be
calculated from
|T-S|=((x.sub.t-x.sub.s).sup.2+(y.sub.t-.sup.y.sub.s).sup.2).sup.1/2.
[0035] And, the zoom control unit 170 judges whether the pointer
movement amount determined in S205 (unit movement amount of the
pointer 310) is equal to or less than the threshold value (whether
the amount is 0), that is, whether, over the unit time (dt), the
pointer 310 selecting the object has been stopped (S206).
[0036] When in this judgment the unit movement amount of the
pointer 310 is 0, that is, the pointer 310 selecting the object is
stopped over the unit time (dt) (when the judgment is S206 is Yes),
the zoom control unit 170 of the zoom processing device 100 further
judges whether the judgment result in the immediately preceding
S206 and the judgment result in the current S206 are the same, that
is, whether the unit movement amount determined immediately before
and the newly determined unit movement amount are both equal to or
less than the threshold value (here, whether they are equal to 0)
(S207).
[0037] When this judgment is No, the zoom control unit 170 sets
(initializes) the value of the prescribed coefficient "m" to 1
(S208), sets (updates) the first magnification used for enlarging
the screen to ".alpha..sup.m" (.alpha.>1) (S209), and performs
enlarged display (zoom-in) at this updated first magnification
".alpha." of the image editing screen 300 including the object
selected by the pointer 310 such that, for example, the pointer 310
is positioned in the center of the image editing screen 300 (S210).
.alpha. may for example be set to a numerical value between 1.0 and
2.0.
[0038] On the other hand, when this judgment is Yes, the zoom
control unit 170 increments the value of the prescribed coefficient
"m" by 1 (S211), and sets (updates) the first magnification used
for enlarging the screen to the magnification ".alpha..sup.m"
(.alpha.>1) larger than the magnification used in the screen
enlargement processing (S210) immediately preceding (S209), and
performs enlarge display (zoom-in) at the updated first
magnification ".alpha..sup.m" of the image editing screen 300,
including the object being selected by the pointer 310, such that
for example the pointer 310 is positioned at the center of the
image editing screen 300 (S211).
[0039] Further, in the judgment of S206, when the unit movement
amount of the pointer 310 is greater than the threshold value
(here, 0), that is, when the pointer 310 selecting the object has
moved during the time until the unit time (dt) elapses (when the
judgment of S206 is No), the zoom control unit 170 further judges
whether the judgment result in the immediately preceding S206 and
the judgment result in the current S206 are the same, that is,
whether both the unit movement amount determined immediately before
and the newly determined unit movement amount are greater than the
threshold value (whether they are 0 or not) (S212).
[0040] When this judgment is No, the zoom control unit 170 sets
(initializes) the value of the prescribed coefficient "n" to 1
(S213), sets (updates) the second magnification used for reducing
the screen to ".beta..sup.n" (1>.beta.>0) (S214), and
performs reduced display (zoom-out) at the updated second
magnification ".beta." of the image editing screen 300 including
the object being selected by the pointer 310 such that, for
example, the pointer 310 is positioned in the center of the image
editing screen 300 (S215). .beta. may for example be set to a
numerical value between 0.5 and 1.0.
[0041] On the other hand, when this judgment is Yes, the zoom
control unit 170 increments the value of the prescribed coefficient
"n" by 1 (S216), sets (updates) the second magnification used for
reducing the screen to the magnification ".beta..sup.n"
(1>.beta.>0) smaller than the magnification used in the
immediately preceding (S215) reduction processing (S214), and
performs reduced display (zoom-out) at the updated second
magnification ".beta..sup.n" of the image editing screen 300
including the object being selected by the pointer 310 such that,
for example, the pointer 310 is positioned in the center of the
image editing screen 300 (S215).
[0042] By repeating each of the above steps (S201 to S216), the
zoom processing unit 140 of the zoom processing device 100
repeatedly performs enlarged display or reduced display of the
image editing screen 300 according to operations of the mouse 110
by the user.
[0043] In this way, by means of the zoom processing device 100 of
the first exemplary embodiment, zooming (enlargement or reduction)
of the screen including an object can be performed merely by
dragging the object using the mouse 100. Further, by suppressing
the movement amount of the pointer 310 which is selecting the
object to be equal to or less than a threshold value throughout a
continuous unit time (dt) (in the above example, by continuing
stoppage), the enlargement magnification of the screen is made
larger (the screen is enlarged in an accelerated manner), and
conversely, by making the movement amount of the pointer 310 which
is selecting the object larger than a threshold value throughout a
continuous unit time (dt) (in the above example, by continuous
movement), the reduction magnification of the screen is made
smaller (the screen is reduced in an accelerated manner), so that a
desire of the user to enlarge or reduce the screen can be
accommodated promptly.
[0044] In the above, an exemplary embodiment of the invention was
described; but this invention is not limited to the above exemplary
embodiment, and can be applied with various modifications.
[0045] As a difference with the first exemplary embodiment, the
zoom processing device 100 can be communicably connected with a
user terminal 500 via a communication circuit 540 (for example, the
Internet or similar), as a so-called application server. For
example, the zoom processing device 100 can function as a server
which distributes map information.
[0046] Further, the user terminal 500 is equipped with constituent
elements comprised by personal computers in general, such as a
mouse 510 and display 520; and a CPU, by reading an Internet
browser program from a HDD or other storage device into RAM and
executing the program, has the functions of an Internet browser
530. Map information transmitted by the zoom processing device 100
is interpreted by the Internet browser 530 and is displayed on the
display 520. In this case, for example the entire background (map)
of the screen displayed on the display 520 is an object.
[0047] In this example, the details of zoom processing performed by
the zoom processing device 100 are basically the same as in the
case of the first exemplary embodiment (FIG. 2), but differ from
the first exemplary embodiment in that the data necessary for
processing and processing results are transmitted and received with
the user terminal 500 over the communication circuit 540.
[0048] More specifically, when the user operating the user terminal
500 operates the mouse 510 and drags a map displayed on the display
520, information relating to this mouse operation is transmitted to
the zoom processing device 100. The zoom processing device 100
performs zooming (enlargement or reduction) of the map information
(information of the map displayed on the display 520) based on
information received from the user terminal 500, and transmits the
zoomed map information to the user terminal 500. By this means, the
zoomed map is displayed on the display 520 connected to the user
terminal 520.
[0049] Further, for example in the first exemplary embodiment,
zooming the screen based on the movement amount of a scrollbar
displayed on the screen can be taken to be zooming the screen based
on the movement amount of the screen which scrolls according to the
scrollbar operation. According to this point of view, an object of
the invention can be attained even by a zoom processing device 600
configured as shown in FIG. 6. The communicable connection of the
mouse 610, display 620, and other constituent elements, and the
provision of the functions of the application execution unit 630,
are similar to the zoom processing device 100 of the first
exemplary embodiment.
[0050] Differences between the zoom processing device 600 and the
zoom processing device 100 of the first exemplary embodiment are
the provision of scrolling amount calculation unit 660 for
calculating the scrolling amount of the screen displayed on the
display 620 based on information acquired from the mouse 610 by the
mouse movement amount acquisition unit 650, and that the zoom
control unit 670 performs enlarged display of the screen at a third
magnification when the scrolling amount is equal to or less than a
threshold value, and performs reduced display of the screen at a
fourth magnification when the scrolling amount is greater than a
threshold value. Setting and updating of magnifications can be
performed by a method similar to that explained in the first
exemplary embodiment.
[0051] By means of this configuration, when a scrollbar operation
is performed by an operation on the mouse 610, and when an
operation is performed on screen scrolling unit (for example, a
scroll wheel or similar) provided in the mouse 610, the screen can
be zoomed based on the screen scrolling amount in for example unit
time.
[0052] Further, for example the first magnification and second
magnification may be set based on the magnitude of the unit
movement amount (|T-S|) of the pointer 310, determined in S205 of
FIG. 2. In this case, the first magnification is set to for example
".alpha.(1+|T-S|)" (.alpha.>1), and the second magnification may
for example be set to ".beta.(1+|T-S|) (1>.beta.>0).
[0053] Further, for example in the first exemplary embodiment, the
judgment of whether the pointer 310, in the state of having
selected an object, is stopped in a unit time (dt) (S206 in FIG.
2), is performed based on the unit movement amount (|T-S|) of the
pointer 310 calculated in S205; but judgment may be performed based
simply on whether information acquired from the mouse 110 has
changed in the unit time (dt). In this case, when the same
information continues to be acquired from the mouse 110 throughout
the unit time (dt) (or, in a case in which the mouse 110 is not
moving, a case in which no information is acquired is also
possible), it can be judged that the pointer 310 is stopped.
[0054] The related art described in the background art causes a
problem, such as, in the technology of Patent Reference 1, in order
to perform scroll processing and zoom processing, a complicated
three-stage operation must be performed in which a scrolling or
zoom mode is activated, and after defining a scrolling or zooming
direction, scrolling or zooming is executed.
[0055] An exemplary advantage according to the present invention
is, in a state in which an object displayed on a screen is selected
by a pointer, merely by moving or stopping the pointer, the screen
can be zoomed based on the movement amount of the pointer. Or,
merely by scrolling the screen, the screen can be zoomed based on
the screen scrolling amount.
[0056] The whole or part of the exemplary embodiments disclosed
above can be described as, but not limited to, the following
supplementary notes.
(Supplementary Note 1)
[0057] A zoom processing device, including:
[0058] a pointer movement amount calculation unit for calculating a
movement amount of a pointer which is selecting an object on a
screen; and
[0059] a zoom control unit for performing enlarged display of a
screen including the object at a first magnification when, as a
result of the calculation, the movement amount of the pointer is
equal to or less than a threshold value, and for performing reduced
display of a screen including the object at a second magnification
when, as a result of the calculation, the movement amount of the
pointer is greater than a threshold value.
(Supplementary Note 2)
[0060] The zoom processing device according to Supplementary note
1, wherein the pointer movement amount calculation unit calculates
the movement amount of the pointer in a unit time, and [0061] when
movement amounts of the pointer in a unit time calculated at the
calculation time and at an immediately preceding calculation time
are equal to or less than a threshold value, the zoom control unit
updates the first magnification to a larger magnification, and
performs enlarged display of the screen including the object at the
updated first magnification, and when movement amounts of the
pointer in a unit time calculated at the calculation time and at an
immediately preceding calculation time are greater than a threshold
value, the zoom control unit updates the second magnification to a
smaller magnification, and performs reduced display of the screen
including the object at the updated second magnification.
(Supplementary Note 3)
[0062] A zoom processing device, including: [0063] a scrolling
amount calculation unit for calculating a screen scrolling amount;
and [0064] a zoom control unit for performing enlarged display of
the screen at a third magnification when, as a result of the
calculation, the scrolling amount is equal to or less than a
threshold value, and for performing reduced display of the screen
at a fourth magnification when, as a result of the calculation, the
scrolling amount is greater than a threshold value.
(Supplementary Note 4)
[0065] A zoom processing method, including: [0066] calculating a
movement amount of a pointer which is selecting an object on a
screen; and [0067] performing enlarged display of a screen
including the object at a first magnification when, as a result of
the calculation, the movement amount of the pointer is equal to or
less than a threshold value, and performing reduced display of a
screen including the object at a second magnification when, as a
result of the calculation, the movement amount of the pointer is
greater than a threshold value.
(Supplementary Note 5)
[0068] A computer program causing an information processing device
to execute the zoom processing method according to Supplementary
note 4.
[0069] While the invention has been particularly shown and
described with reference to exemplary embodiments thereof, the
invention is not limited to these embodiments. It will be
understood by those of ordinary skill in the art that various
changes in form and details may be made therein without departing
from the spirit and scope of the present invention as defined by
the claims.
* * * * *