JP5256628B2 - Image display device, image enlargement / reduction method and image enlargement / reduction control program used in the image display device - Google Patents

Description

  The present invention relates to an image display device, an image enlargement / reduction method and an image enlargement / reduction control program used in the image display device, and is used, for example, in a personal computer or a mobile phone, and enlarges / reduces an image relative to a display screen. The present invention relates to an image display device suitable for processing and scrolling, an image enlargement / reduction method and an image enlargement / reduction control program used in the image display device.

  In the image enlargement or reduction process in the conventional image display device, since the enlargement area or reduction area of the image is enlarged or reduced according to the magnification, when the starting point of the enlargement area or reduction area changes when the image is scrolled, There is a problem that the image after enlargement or reduction is not the same as the image before scrolling. For example, in the reduction process, as shown in FIG. 8, there is an image having white pixels [1], [2], [3], [4] and a black pixel column [5]. For example, if the pixel [1] is used as a starting point and the magnification is reduced by 1/4, the image shown in FIG. 9 is obtained. On the other hand, when the starting point is changed by scrolling, the image is shown in FIG. 10 after the reduction because the pixel [2] is used as the starting point and the thinning is reduced by ¼.

Conventionally, as this type of technology, for example, there is one described in Patent Document 1.
In the image display system described in Patent Document 1, the processor updates the pointer coordinates based on the reception operation information from the input device, updates the enlargement factor and the reference coordinate values based on the updated pointer coordinates, and stores them. A partial image is created from the original image in the device based on the updated reference coordinate value, and after the size is changed according to the updated enlargement ratio, the pointer is superimposed on the updated pointer coordinate. A display image is created, and the display image is displayed on the display device.

  In the image processing system described in Patent Document 2, the display range of the original image data on the display screen is detected, and the image data is divided into divided images having a size corresponding to the size of the display range. The The divided image is stored as encoded still image data, or a plurality of divided still images are stored as motion code data using the frame as a frame. The code data of the original image data is divided into small blocks in advance, and the division information is stored. When generating code data of a divided image having a necessary size, a code string of necessary small blocks is extracted and synthesized based on the division information. This shortens the time for image expansion and scrolling.

In the image display device described in Patent Document 3, when an image is enlarged / reduced and displayed again, first, the magnification is set, the screen size is acquired, and the size of the image area displayed after the enlargement / reduction is performed. To get. The acquired screen size is compared with the size of the image area, and if the entire screen cannot be displayed, scroll display is performed, so that the edit base point in the image to be displayed and the display base point in the display screen are acquired. Finally, the image is redisplayed so that the editing base point and the display base point overlap. For this reason, by selecting an edit base point as desired, a desired portion can be displayed on the screen immediately after redisplay.
Japanese Patent Laid-Open No. 2003-186587 (Abstract, FIG. 1) Japanese Patent Laying-Open No. 2005-092007 (Abstract, FIG. 6) Japanese Patent Application Laid-Open No. 08-138032 (Abstract, FIG. 9)

However, the conventional image display device has the following problems.
That is, there are black pixels in the image of FIG. 9, but there are no black pixels in the image of FIG. 10, so when the starting point changes due to scrolling, the image displayed before and after scrolling changes. There is a problem. In addition, it is possible to obtain the same display even when scrolling by displaying the partial area by enlarging or reducing the entire image in advance, but in this case, it is necessary to enlarge or reduce the entire image once. Therefore, there is a problem that high-speed processing becomes difficult.

  Further, in the image display system described in Patent Document 1, a partial image is created based on the updated reference coordinate value, and the partial image is displayed after the size is changed, which improves the above-described problem. It is not a thing.

  In the image processing system described in Patent Document 2, the image data is divided and the time required for image expansion and scrolling is shortened. However, the above problems are not improved.

  In the image display device described in Patent Document 3, when an image is enlarged / reduced, a desired position of the image is displayed again after enlargement / reduction, but this does not improve the above-described problem.

  The present invention has been made in view of the above-described circumstances. Even when the image is scrolled and the starting point of the reduction area / enlargement area is changed, the reduction / enlargement and the display are performed at high speed so that the display is the same. It is an object of the present invention to provide an apparatus, an image enlargement / reduction method and an image enlargement / reduction control program used in the image display apparatus.

In order to solve the above-described problem, the invention according to claim 1 relates to an image display device having a function of enlarging / reducing an image and scrolling and displaying the image . The magnification of the enlargement / reduction is determined by a fraction, and the image is virtually divided by a square with one side equal to the denominator of the magnification with respect to the origin of the image, and the image is enlarged by combining the squares Select the smallest first virtual partition area that includes the display target area to be reduced, enlarge / reduce the selected first virtual partition area to the second virtual partition area according to the magnification, An image processing unit that outputs only the display target region of the second virtual section region, and a display processing unit that displays the display target region output from the image processing unit on a screen. That.

A second aspect of the present invention relates to the image display apparatus according to the first aspect, wherein the image processing means is a magnification selection means for determining the enlargement / reduction magnification by a fraction, and the magnification based on the origin of the image. By virtually dividing the image with a square having one side equal in number to the denominator and combining the squares, the smallest first virtual segmented region including the display target region to be enlarged / reduced is obtained. The enlargement / reduction area selection means to be selected and the first virtual section area selected by the enlargement / reduction area selection means are virtually divided by a square having a pixel number equal to the number of molecules of the magnification as one side. In addition, the image processing apparatus includes: enlargement / reduction means for enlarging / reducing to the second virtual partition area; and display area calculation means for outputting only the display target area of the second virtual partition area. age There.

  A third aspect of the present invention relates to the image display device according to the second aspect, wherein the magnification selection means stores a plurality of magnifications as selection candidates in advance in a fractional format, and selects from these. It is characterized by being.

The invention according to claim 4 relates to an image enlarging / reducing method used in an image display device having a function of enlarging / reducing an image and scrolling and displaying the image . The magnification of the enlargement / reduction is determined by a fraction, and the image is virtually divided by a square with one side equal to the denominator of the magnification with respect to the origin of the image, and the image is enlarged by combining the squares Select the smallest first virtual partition area that includes the display target area to be reduced, enlarge / reduce the selected first virtual partition area to the second virtual partition area according to the magnification, An image enlarging / reducing process for outputting only the display target area of the second virtual segmented area and a display process for displaying the display target area output by the image enlarging / reducing process on the screen are performed. When To have.

The invention according to claim 5 relates to the image enlargement / reduction method according to claim 4, wherein in the image enlargement / reduction process, a magnification selection process for determining the enlargement / reduction ratio by a fraction, and a starting point of the image As a reference, the image is virtually divided by a square having one side with the same number of pixels as the denominator of the magnification, and by combining the squares, the smallest first first image including the display target region to be enlarged / reduced is combined. An enlargement / reduction area selection process for selecting a virtual partition area, and the first virtual partition area selected in the enlargement / reduction area selection process is virtually represented by a square having one side with the number of pixels equal to the number of molecules of the magnification. Enlarging / reducing processing for enlarging / reducing to the second virtual segmented area, and a display area calculating process for outputting only the display target area of the second virtual segmented area. Features and To have.

  The invention according to claim 6 relates to the image enlargement / reduction method according to claim 5, wherein in the magnification selection process, a plurality of magnifications that are candidates for selection are held in advance in a fractional format, and a selection is made from these. It is a feature.

  A seventh aspect of the present invention relates to an image enlargement / reduction control program, which causes a computer to function as the image processing means according to any one of the first to third aspects.

According to the configuration of the present invention, the enlargement / reduction magnification is determined by the fraction by the image processing means, and the image is virtually formed by a square having one side equal to the denominator of the magnification with respect to the origin of the image. By dividing the square and combining the squares, the smallest first virtual section area including the display target area to be enlarged / reduced is selected, and the selected first virtual section area is selected according to the magnification. Are enlarged / reduced to the virtual partition region, and only the display target region of the second virtual partition region is output. Then, the display target area output from the image processing means is displayed on the screen by the display processing means. As a result, even when the image is scrolled and the starting point of the reduction / enlargement area changes, reduction / enlargement and display with the same display can be performed at high speed.

In the image processing means, the magnification selection means determines the enlargement / reduction magnification as a fraction, and the enlargement / reduction area selection means sets the number of pixels equal to the denominator of the magnification as one side based on the origin of the image. By virtually dividing the image with squares to be combined and combining the squares, the smallest first virtual section area that includes the display target area to be enlarged / reduced is selected. The virtual partition region is enlarged / reduced to a second virtual partition region virtually divided by a square having one side with the number of pixels equal to the number of molecules of the magnification, and the display region calculation means performs the second virtual partition region. since only the display target region is output out of, even if the starting point of the scroll to reduced / enlarged region image is changed, it is possible to perform reduction / expansion and display displays the same at a high speed

A plurality of enlargement / reduction magnifications are held in a fractional format, and a magnification selection unit 11 for selecting from these, and a virtual image with a square having one side equal to the denominator of the magnification on the basis of the starting point of the image . By combining these squares, the enlargement / reduction area calculation unit that selects the smallest first virtual partition area that includes the display target area to be enlarged / reduced , and the first virtual partition area are An enlargement / reduction unit 13 that enlarges / reduces to a second virtual partition region virtually divided by a square having a pixel number equal to the number of molecules on one side, and outputs only the display target region of the second virtual partition region Provided is an image display device including a display area calculation unit 14 for performing display and a display processing unit 20 for displaying a display target region on a screen, an image enlargement / reduction method and an image enlargement / reduction control program used in the image display device The

FIG. 1 is a block diagram showing an electrical configuration of a main part of an image display apparatus according to an embodiment of the present invention.
The image display apparatus of this example has a function of enlarging / reducing and scrolling and displaying an input image in, and includes an image processing unit 10 and a display processing unit 20 as shown in FIG. . The image processing unit 10 is an information processing apparatus such as a personal computer, and a CPU (central processing unit) 10a as a computer that controls the entire image processing unit 10 and an image enlargement / reduction control program for operating the CPU 10a. It has a recorded ROM (Read Only Memory) 10b. In particular, in this embodiment, the image processing unit 10 includes a magnification selection unit 11, an enlargement / reduction area calculation unit 12, an enlargement / reduction unit 13, and a display area calculation unit 14.

The magnification selection unit 11 is configured to hold a plurality of enlargement / reduction magnifications that are candidates for selection in advance in a fractional format [numerator / denominator] and select from these. The enlargement / reduction area calculation unit 12 virtually divides the image of the input image vi with a square having one side equal to the denominator of the magnification with reference to the starting point of the input image vi , and combines these squares, The smallest first virtual section area that includes the display target area to be enlarged / reduced is selected. The enlargement / reduction unit 13 is a second virtual region in which the first virtual segmented region selected by the enlargement / reduction region calculation unit 12 is virtually divided by a square having a pixel number equal to the number of molecules of the magnification. Enlarge / reduce to segmented area. The display area calculation unit 14 outputs only the display target area in the second virtual segment area. The display processing unit 20 is composed of, for example, a liquid crystal display device and displays the display target area output from the display area calculation unit 14 on the screen.

2 is a diagram for explaining a reduction area selection process by the enlargement / reduction area calculation unit 12, FIG. 3 is a diagram for explaining a reduction process by the enlargement / reduction part 13, and FIG. 4 is a display by the display area calculation unit 14 in the reduction process. FIG. 5 is a diagram for explaining an area calculation process, FIG. 5 is a diagram for explaining an enlargement area selection process by the enlargement / reduction area calculation unit 12, FIG. 6 is a diagram for explaining an enlargement process by the enlargement / reduction unit 13, and FIG. It is a figure explaining the display area calculation process by the display area calculation part 14 in a process.
The processing contents (1) and (2) of the image enlargement / reduction method used in the image display apparatus of this example will be described with reference to these drawings.
In this image display device, the enlargement / reduction magnification is determined by a fraction, and the input image vi is virtually divided by a square with one side equal to the denominator of the magnification with the origin of the input image vi as a reference. , By combining the squares, the smallest first virtual section area including the display target area to be enlarged / reduced is selected, and the selected first virtual section area is set to the second virtual section according to the magnification. The image is enlarged / reduced to the divided area, and only the display target area in the second virtual divided area is output (image enlargement / reduction process). Then, the display target area output by the image enlargement / reduction process is displayed on the screen (display process).

(1) Reduction processing First, the magnification selection unit 11 stores a plurality of candidate magnifications in a fractional format ([numerator / denominator]) in advance, and one of them corresponding to the reduction processing is selected. (Magnification selection process). In the enlargement / reduction area calculation unit 12, as shown in FIG. 2, the image va is formed as a square with one side having the same number of pixels as the denominator dm of the magnification from the origin bp of the image va (corresponding to the input image vi in FIG. 1). A region that is virtually divided and includes a reduced region ra by a combination of divided square regions and has a minimum area is selected as a new reduced region rb (first virtual divided region) (reduced region selection process). . For this reason, the reduced area rb is an area surrounded by pixels of an integer multiple of the denominator of magnification from a position advanced from the origin bp of the image va by an integer multiple of the denominator of magnification. In this case, the end point ep of the reduced area rb may be outside the image va depending on the size of the reduced area rb.

  In the enlargement / reduction processing unit 13, the new reduction region rb selected by the enlargement / reduction region calculation unit 12 in the image va is reduced according to the magnification selected by the magnification selection unit 11. In this case, as shown in FIG. 3, the reduced region rb is divided into squares with one side of the denominator of magnification, and this square is reduced to a square with one side having the same number of pixels as the numerator nm of magnification. In the reduced image rc (second virtual segmented region), the number of squares with one side of the numerator nm of magnification is the same as the number of squares with one side of the denominator dm of the reduced region rb.

Since the reduced area rb is an area larger than the area that should be reduced, the reduced image rc is also larger than the area that should be displayed. An area to be displayed in the image rc is determined (display area calculation process). That is, as shown in FIG. 4, the coordinates of the starting point bp of the image va are bp (0, 0), the coordinates of the starting point cp of the reduced image rc are cp (0, 0), and the coordinates of the starting point ap of the reduced area ra Ap (A1, A2), the coordinates of the starting point dp of the reduced area rb are dp (B1, B2), and the coordinates of the starting point fp of the area rd to be displayed in the reduced image rc are fp (C1, C2 ), And the truncation process after the decimal point of the calculation result is expressed by INT [(calculation formula)], the coordinates fp (C1, C2) of the starting point fp of the region rd are
C1 = INT [(B1-A1) × magnification]
C2 = INT [(B2-A2) × magnification]
As determined.

  The display processing unit 20 displays a region rd starting from the coordinates fp (C1, C2) determined by the display region calculation unit 14 (display processing). As described above, in the image reduction process, the magnification is selected from predetermined candidates, and the first virtual section area corresponding to the reduction area and the magnification is reduced, so that the image is scrolled to start the reduction area. Reduction and display are performed at high speed so that the display becomes the same when the change occurs.

(2) Enlargement process The magnification selection unit 11 selects one corresponding to the enlargement process from a plurality of candidate magnifications (magnification selection process). As shown in FIG. 5, the enlargement / reduction area calculation unit 12 virtually divides the image va from the starting point bp of the image va by a square for each denominator dm of the magnification, and the enlargement area ua is formed by a combination of the divided square areas. A region that is included and has a minimum area is selected as a new enlarged region ub (first virtual segmented region) (enlarged region selection process).
For this reason, the enlarged region ub is a region surrounded by pixels of an integer multiple of the denominator of magnification from a position advanced from the origin bp of the image va by an integral multiple of the denominator of magnification. In this case, the end point ep of the enlarged area ub may be outside the image va depending on the size of the enlarged area ub.

  In the enlargement / reduction processing unit 13, the new enlargement region ub determined by the enlargement / reduction region calculation unit 12 is enlarged in the image va according to the magnification determined by the magnification selection unit 11. In this case, as shown in FIG. 6, the enlargement region ub is divided into squares with one side of the denominator of magnification, and this square is enlarged into a square with one side having the same number of pixels as the numerator nq of magnification. In the enlarged image re (second virtual segmented region), the number of squares having one side of the numerator nm of magnification is the same as the number of squares having one side of the denominator dm of the magnification of the enlarged region ub.

Since the enlarged area ub is an area larger than the area that should originally be enlarged, the image re after enlargement is also larger than the area that should be originally displayed. An area to be displayed in the image re is determined (display area calculation process). That is, as shown in FIG. 7, the coordinates of the starting point bp of the image va are bp (0, 0), the coordinates of the starting point hp of the enlarged image re are hp (0, 0), and the coordinates of the starting point ap of the enlarged region ua. Ap (A1, A2), the coordinates of the starting point dp of the enlarged region ub are dp (B1, B2), and the coordinates of the starting point jp of the region rg to be displayed in the enlarged image re are jp (C1, C2 ), And the truncation processing after the decimal point of the calculation result is expressed by INT [(calculation formula)], jp (C1, C2) which is the coordinates of the starting point jp of the region rg is
C1 = INT [(B1-A1) × magnification]
C2 = INT [(B2-A2) × magnification]
As determined.

  In the display processing unit 20, the region rg starting from the coordinate jp (C1, C2) determined by the display region calculation unit 14 is displayed (display processing). As described above, in the image enlargement process, the magnification is selected from predetermined candidates, and the first virtual section area corresponding to the enlargement area / magnification is enlarged. Therefore, the image is scrolled to start the enlargement area. Enlargement and display are performed at high speed so that the display is the same when the change occurs.

As described above, in this embodiment, the enlargement / reduction magnification is determined by a fraction, and the input image vi is a virtual square with one side having the same number of pixels as the denominator of the magnification with the origin of the input image vi as a reference. By dividing the square and combining the squares, the smallest first virtual section area including the display target area to be enlarged / reduced is selected, and the selected first virtual section area is selected according to the magnification. the second is enlarged / reduced to a virtual partitioned area, only the display target area among the same second virtual partitioned area is output, since the display target area is displayed on the screen, reduced to scroll the input image vi / Even when the starting point of the enlargement area changes, reduction / enlargement and display with the same display are performed at high speed.

  The present invention can be applied to all electronic devices having an image enlargement / reduction display function and a scroll display function, and is particularly effective when the starting point of the enlargement / reduction area is changed by scrolling.

It is a block diagram which shows the electrical constitution of the principal part of the image display apparatus which is one Example of this invention. It is a figure explaining the reduction | restoration area | region selection process by the expansion / contraction area | region calculation part. It is a figure explaining the reduction process by the expansion / contraction part 13. FIG. It is a figure explaining the display area calculation process by the display area calculation part 14 in a reduction process. It is a figure explaining the expansion area | region selection process by the expansion / contraction area | region calculation part. It is a figure explaining the expansion process by the expansion / contraction part. It is a figure explaining the display area calculation process by the display area calculation part 14 in an expansion process. It is a figure explaining the reduction process of the image in the conventional image display apparatus. It is a figure explaining the reduction process of the image in the conventional image display apparatus. It is a figure explaining the reduction process of the image in the conventional image display apparatus.

Explanation of symbols

10 Image processing unit (image processing means)
10a CPU (Central Processing Unit)
10b ROM (read-only memory)
11 Magnification selection part (magnification selection means)
12 Enlargement / reduction area calculation unit (enlargement / reduction area selection means)
13 Enlarging / reducing part (enlarging / reducing means)
14 Display area calculation unit (display area calculation means)
20 Display processing unit (display processing means)

Claims (7)

An image display device having a function of enlarging / reducing an image and scrolling and displaying the image,
When the image is enlarged / reduced and displayed, the enlargement / reduction magnification is determined as a fraction, and the image is virtually represented by a square with one side equal to the denominator of the magnification with respect to the origin of the image. By dividing the squares and combining the squares, the smallest first virtual section area including the display target area to be enlarged / reduced is selected, and the selected first virtual section area is selected according to the magnification. Image processing means for enlarging / reducing to two virtual section areas and outputting only the display target area of the second virtual section area, and displaying the display target area output from the image processing section on the screen An image display apparatus comprising: a display processing unit. The image processing means includes
A magnification selection means for determining the magnification of the enlargement / reduction by a fraction;
A minimum including the display target region to be enlarged / reduced by virtually dividing the image with a square having one side equal to the denominator of the magnification with respect to the origin of the image, and combining the squares Enlargement / reduction area selection means for selecting the first virtual section area of
The first virtual partition region selected by the enlargement / reduction region selection means is expanded to the second virtual partition region virtually divided by a square having one side with the number of pixels equal to the number of molecules of the magnification. / Enlargement / reduction means to reduce,
The image display device according to claim 1, further comprising a display area calculation unit that outputs only the display target area of the second virtual segment area. The magnification selection means includes:
3. The image display apparatus according to claim 2, wherein a plurality of magnifications that are candidates for selection are stored in advance in a fractional format and selected from these. An image enlargement / reduction method used in an image display device having a function of enlarging / reducing an image and scrolling and displaying the image,
When the image is enlarged / reduced and displayed, the enlargement / reduction magnification is determined as a fraction, and the image is virtually represented by a square with one side equal to the denominator of the magnification with respect to the origin of the image. By dividing the squares and combining the squares, the smallest first virtual section area including the display target area to be enlarged / reduced is selected, and the selected first virtual section area is selected according to the magnification. An image enlargement / reduction process for enlarging / reducing to two virtual partition areas and outputting only the display target area of the second virtual partition area, and the display target area output by the image enlargement / reduction process An image enlarging / reducing method characterized by performing display processing for displaying the image on the screen. In the image enlargement / reduction process,
A magnification selection process for determining the enlargement / reduction magnification by a fraction;
A minimum including the display target region to be enlarged / reduced by virtually dividing the image with a square having one side equal to the denominator of the magnification with respect to the origin of the image, and combining the squares Enlargement / reduction area selection processing for selecting the first virtual section area of
The first virtual partition region selected by the enlargement / reduction region selection process is expanded to the second virtual partition region virtually divided by a square having one side with the number of pixels equal to the number of molecules of the magnification. / Enlargement / reduction processing to reduce,
5. The image enlargement / reduction method according to claim 4, wherein a display area calculation process for outputting only the display target area of the second virtual segment area is performed. In the magnification selection process,
6. The method for enlarging / reducing an image according to claim 5, wherein a plurality of magnifications as selection candidates are held in advance in a fractional format and selected from these.   A computer-readable image enlargement / reduction control program for causing a computer to function as the image processing means according to any one of claims 1 to 3.

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