WO2007080880A1

WO2007080880A1 - Image display device and image display program

Info

Publication number: WO2007080880A1
Application number: PCT/JP2007/050146
Authority: WO
Inventors: Masatoshi Sugiura
Original assignee: Brother Kogyo Kabushiki Kaisha
Priority date: 2006-01-13
Filing date: 2007-01-10
Publication date: 2007-07-19

Abstract

Image information including information corresponding to each of display magnifications is previously stored in a display image storage section (131). When the user specifies a change of the display magnification of the image display device, the image information corresponding to the selected display magnification is read out of the display image storage section (131) and the image information is displayed on the display section (2).

Description

Specification

Image display device and image display program

Technical field

The present invention relates to an image display device and an image display program for displaying an image corresponding to a display magnification. Background art

Conventionally, as a method of enlarging and displaying a part of an image that is displayed, a character font is built in, rasterized processing is performed on the stored character code data, and a font having a different size is assigned at that time. You can enlarge the image using software or software.

V, and how to display a part of it is known.

[0003] In the former case, since the rasterization process is performed each time display is performed, display with excellent readability can be performed even if enlargement is performed. However, the terminal must be equipped with character font data and handled. There was a problem that the data was also limited to data containing text.

[0004] In the case of the latter method, the time required for processing greatly affects the processing speed of the hardware used, and the quality of the processing is also affected by the thin lines that are smooth and the lines are crushed. There was a problem that occurred.

[0005] In Patent Document 1, enlarged images with different magnifications are prepared in advance for the purpose of high-speed display of enlarged display using bifocal display. Display them in combination.

Patent Document 1: JP-A-8-69275

Disclosure of the invention

Problems to be solved by the invention

[0006] However, although the above-described conventional method can perform enlarged display using Bifocal display, it is necessary to display the magnification of an image to be displayed when it is desired to display an image with a uniform magnification on the screen. The switching cannot be made at high speed.

The present invention has been made to solve such problems, and an image display device and an image display program capable of changing the display magnification of an image with a uniform display magnification at high speed. The purpose is to provide lamb.

Means for solving the problem

In order to achieve the above object, the present invention provides a display means for displaying an image, a first storage means for storing first information, a reading means for reading first information from the first storage means, An image display device comprising: display control means for displaying an image with a uniform magnification on the display means based on the first information read by the loading means; and magnification selection means for selecting the display magnification, wherein the first storage means The reference image information of the reference display magnification is stored as the first information, and the second information corresponding to each display magnification different from the reference display magnification is stored, and the reading means determines the reference display magnification by the magnification selection means. When a different display magnification is selected, the second information corresponding to the selected display magnification is read from the first storage means, and the display control means displays based on the second information read by the reading means. Uniform to means There is provided an image display device characterized by displaying an image of various magnifications.

According to such a configuration, in addition to the reference image information of the reference display magnification, information corresponding to other display magnifications is stored in the storage unit in advance, so that the display magnification different from the reference display magnification is stored. When display change is designated, information corresponding to the display magnification is read from the storage means, and an image with a uniform magnification can be displayed based on the information. Therefore, even when an instruction to change the display magnification is given, it is possible to display images with uniform magnifications with different display magnifications at high speed.

[0010] The second information is preferably corresponding image information corresponding to each display magnification different from the reference display magnification.

According to such a configuration, as the second information corresponding to each display magnification, the corresponding image information is stored in the storage unit in advance, so that an image can be displayed at high speed based on the corresponding image information. .

[0012] The image display device further includes display area designating means for designating an area when the corresponding image information read by the reading means is larger than the display area size of the display means! / Preferably, the means causes the display means to display the area designated by the display area designation means among the images based on the corresponding image information read by the reading means.

[0013] According to such a configuration, when the corresponding image information is larger than the display area size, Since an area to be displayed can be designated, an image area desired by the user can be displayed.

[0014] The image display device further includes display image designating means, the corresponding image information includes a plurality of pieces of divided image information having a display area size equal to or smaller than the display means size, and the display image designating means is provided by a magnification selecting means. One of a plurality of pieces of divided image information of the corresponding image information corresponding to the selected display magnification is designated, and the reading means reads the divided image information designated by the display image designation means. It is preferable that the display control unit reads from the storage unit and causes the display unit to display an image based on the divided image information read by the reading unit.

[0015] According to such a configuration, when the corresponding image information is stored as a plurality of pieces of divided image information and only the designated divided image information is displayed, the entire corresponding image information having a large size is read and displayed. In addition, the memory area for image display can be reduced, and the processing speed can be increased.

[0016] In addition, it is preferable that the image displayed based on the divided image information has an overlapping region that overlaps between the images.

[0017] According to such a configuration, it is possible to perform a habit display that makes it easy to grasp the context and the connection before and after when performing page turning or the like.

[0018] The display magnification different from the standard display magnification is preferably an integer multiple of the standard display magnification.

[0019] According to such a configuration, even when the display screen is switched, the image is displayed in the full display area, and therefore no unnecessary blank space is generated. As a result, it is possible to provide a display with good visual efficiency.

[0020] Preferably, the first storage means stores the divided image information in a state rotated by 90 ° with respect to the reference image information.

[0021] According to such a configuration, the display image can be browsed by rotating the image display device itself so long as the image display device can hold the image.

[0022] The image display device further includes a display image designating unit, and the corresponding image information includes a plurality of pieces of divided image information each having a display area size equal to or less than the display unit size. The display image designating unit includes: Multiple divisions of image information corresponding to the display magnification selected by the magnification selection means Two or more pieces of divided image information of the image information are designated, and the reading means reads all the divided image information designated by the display image designation means from the first storage means, and the display control means is the reading means. It is preferable to display the composite image on the display means based on the information of all the divided images read by ヽ.

[0023] According to such a configuration, since a necessary number of pieces of divided image information are combined and displayed, an image display memory is used rather than reading and displaying the entire corresponding image information having a large size. The area can be reduced and the processing speed can be increased. Also, it is possible to execute a process of scrolling for each unit of the divided image information.

[0024] The image display device further includes second storage means for storing management information indicating a correspondence relationship between the display magnification and the first information and the second information, and the reading means is configured to calculate the magnification based on the management information. It is preferable to read the first information or the second information corresponding to the display magnification selected by the selection means.

[0025] According to such a configuration, since the image information is read with reference to the management information, even if the number of stored image information increases, the display can be performed at high speed, and the display magnification can be increased later. Management also becomes easier when the number of candidates increases.

[0026] In addition, the corresponding image based on the second information has the same width as the reference image based on the first information in the first direction, and in the second direction orthogonal to the first direction. It is preferable that the character size in the corresponding image is different from the character size in the reference image.

[0027] According to such a configuration, even if the display magnification is changed, the entire image can be viewed by executing page feed in only one of the horizontal and vertical directions.

[0028] The image display device further includes code length determining means for determining the code length of the compression information based on the display magnification selected by the magnification selecting means, and the corresponding image information is compressed information. The larger the selected display magnification is, the more preferably the code length determining means determines a longer code length.

[0029] According to such a configuration, the image information is compressed and stored, and the code length is changed depending on the display magnification. Therefore, the storage capacity can be effectively saved by the compression.

[0030] Further, the display control means displays the table based on the corresponding image information read by the reading means. It is preferable to display thumbnail images on the display means.

[0031] According to such a configuration, when the display magnification is the reduction magnification, the thumbnail display can be performed and the entire image can be viewed.

[0032] The image display device further includes third storage means for storing correspondence information, and the second information is provided corresponding to each display magnification different from the reference display magnification, and the difference value in each pixel is obtained. The correspondence information is information indicating the correspondence between each pixel in the reference image information and each pixel in the difference information, and the reading means is the display magnification selected by the magnification selecting means. The difference information reading means for reading the corresponding difference information from the first storage means, and the pixel of the reference image information corresponding to the value of each pixel of the difference information read by the difference information reading means based on the correspondence information Display image information generating means for generating display image information by adding the values of the display image, and the display control means is based on the display image information generated by the display image information generating means. The table It is preferable to display it on the display means.

[0033] According to such a configuration, since the reference image information power display image information is generated based on the correspondence information and the difference information, and the image is displayed based on this, rather than storing the display image information itself. The storage capacity of the storage means can be reduced.

[0034] The second information is provided corresponding to each display magnification different from the reference display magnification, and is difference information indicating a difference value in each pixel. The reading means is selected by the magnification selecting means. The difference information reading means for reading the difference information corresponding to the display magnification from the first storage means, and the magnification image information generation for generating the magnification image information corresponding to the display magnification selected by the magnification selection means from the reference image information And display image information generating means for generating display image information by adding the pixel value of the magnification image information corresponding to the value of each pixel of the difference information read by the difference information reading means. The display control means preferably displays an image with a uniform magnification on the display means based on the display image information generated by the display image information generation means.

[0035] According to such a configuration, magnification image information is generated from the reference image information, display image information is generated based on the magnification image information power difference information, and an image is displayed based on the display image information. Display image from reference image information without having to memorize correspondence information Information can be generated.

[0036] Further, the image display device further includes fourth storage means for storing magnification data indicating a plurality of different display magnifications, and the magnification selection means selects one display magnification from the plurality of different display magnifications. I prefer to choose ヽ.

According to such a configuration, it is possible to easily grasp the display magnification corresponding to the first information and the second information stored in the first storage unit.

[0038] Further, the image display device includes display means for displaying an image, reading means for reading first information that is reference image information of the reference display magnification from the external storage means, and first information read by the reading means. An image display apparatus comprising a display control means for displaying an image with a uniform magnification on the display means and a magnification selection means for selecting a display magnification, wherein the reading means uses the magnification selection means to determine the reference display magnification. If a different display magnification is selected

The second information corresponding to the selected display magnification is read by the external storage means, and the display control means displays the image at a uniform magnification on the display means based on the second information read by the reading means. I like it.

[0039] According to such a configuration, in addition to the reference image information of the reference display magnification, information corresponding to other display magnifications is stored in the external storage unit in advance, so that a display different from the reference display magnification is displayed. When display change to magnification is designated, information corresponding to the display magnification is read from the external storage means, and an image with a uniform magnification can be displayed based on this information. Therefore, even when an instruction to change the display magnification is given, it is possible to display images with uniform magnifications with different display magnifications at high speed. Further, since the reference image information and the like are acquired from the external storage means, the storage capacity of the image display device itself can be reduced.

[0040] The image display program causes the computer to function as various processing means of the image display device.

[0041] According to such a configuration, the image display program can exert the effects as various processing means of the image display device by causing the computer to execute the program.

The invention's effect

[0042] According to the configuration of the present invention, it is possible to provide an image display apparatus and an image display program capable of changing the display magnification of an image with a uniform display magnification at high speed. Brief Description of Drawings

FIG. 1 is a block diagram showing a configuration of an image display device 1.

FIG. 2 is a front view of the image display device 1.

FIG. 3 is a configuration diagram showing a data structure of the display magnification storage unit 121 of the RAM 12.

FIG. 4 is a configuration diagram showing a data structure of a display image storage unit 131 of the memory card 13.

FIG. 5 is a flowchart of a display magnification change process (1) in the first embodiment.

[FIG. 6 (a)] FIG. 6 (a) is an explanatory diagram in the case of generating enlarged image information having a reference image information power of 200% display magnification using difference information.

[FIG. 6 (b)] FIG. 6 (b) is an explanatory diagram in the case of generating enlarged image information with a display magnification of 400% from the reference image information using the difference information.

[FIG. 6 (c)] FIG. 6 (c) is a configuration diagram showing a data structure of correspondence information between the reference image information and the enlarged image information with a display magnification of 200%.

[FIG. 6 (d)] FIG. 6 (d) is an explanatory diagram showing a data structure of correspondence information between the reference image information and the enlarged image information with a display magnification of 400%.

FIG. 7 is a flowchart of a display magnification change process (2) in the second embodiment of the present invention.

FIG. 8 is a flowchart of a display magnification change process (3) in the third embodiment of the present invention.

FIG. 9 is a flowchart of display magnification change processing (4) in the fourth embodiment of the present invention.

[FIG. 10] FIG. 10 is an explanatory diagram of creating enlarged image information by changing the character layout in accordance with the display area.

[FIG. 11] FIG. 11 is an explanatory diagram when creating enlarged image information using correspondence information in the sixth embodiment of the present invention.

FIG. 12 is a flowchart of display magnification change processing (6) in the sixth embodiment of the present invention.

[FIG. 13] FIG. 13 is a diagram illustrating the display magnification change processing (6) in S64 in the sixth embodiment of the present invention. It is a flowchart of the area | region expansion process performed.

[14 (a)] FIG. 14 (a) is a configuration diagram showing a management table in the seventh embodiment of the present invention.

[14 (b)] FIG. 14 (b) is a configuration diagram showing a data structure of the display image storage unit in the seventh embodiment of the present invention.

[14 (c)] FIG. 14 (c) is a configuration diagram showing a management table in the eighth embodiment of the present invention.

[14 (d)] FIG. 14 (d) is a configuration diagram showing a data structure of the display image storage unit in the eighth embodiment of the present invention.

FIG. 15 (a) is an explanatory diagram of divided image information.

[15 (b)] FIG. 15 (b) is an explanatory diagram of the divided image information.

[15 (c)] FIG. 15 (c) is an explanatory diagram of divided image information.

FIG. 16 is a configuration diagram showing a data structure of a display image storage unit in the eighth embodiment of the present invention.

FIG. 17 is a flowchart of display magnification change processing (8) in the eighth embodiment of the present invention.

[FIG. 18] FIG. 18 is a flowchart of the display area moving process executed in the display magnification changing process (8).

FIG. 19 is an explanatory diagram when the display magnification is only an integer multiple in the ninth embodiment of the present invention.

[FIG. 20 (a)] FIG. 20 (a) is an explanatory diagram in the case of creating divided image information by vertically dividing enlarged image information in the tenth embodiment of the present invention.

圆 20 (b)] FIG. 20 (b) is an explanatory diagram when the divided image information is created by dividing the enlarged image information horizontally in the tenth embodiment of the present invention.

[21 (a)] FIG. 21 (a) is an explanatory diagram in a case where enlarged image information is rotated and stored in the eleventh embodiment of the present invention.

[21 (b)] FIG. 21 (b) is an explanatory view showing an image display device displaying reference image information in the eleventh embodiment of the present invention. [FIG. 21 (c)] FIG. 21 (c) is an explanatory diagram when the enlarged image information is browsed by rotating the image display device in the eleventh embodiment of the present invention.

FIG. 22 is a flowchart of compressed image creation processing in the twelfth embodiment of the present invention.

FIG. 23 is a flowchart of a compressed image expansion process in the twelfth embodiment of the present invention.

FIG. 24 is a flowchart of a display magnification changing process (13) in the thirteenth embodiment of the present invention.

FIG. 25 is a flowchart of thumbnail page generation processing executed in display magnification change processing (13).

[FIG. 26] FIG. 26 is a flowchart of a thumbnail arrangement position determination process executed in the thumbnail page generation process.

Explanation of symbols

1 Image display device

2 Display section

3 Input section

10 CPU

11 ROM

12 RAM

13 memory card

14 Data receiver

31 Next button

32 Front button

34 Zoom button

35 Reduce button

100 reference image information

105 Enlarged image information

121 Display magnification storage 122 Image display buffer

131 Display image storage

200 enlarged image

201-204, 211-214 divided image information

215-222 overlapping area

300 enlarged display image

301-309 divided image information

332 management table

500 reference image information

600, 700 Enlarged image information

610, 710 differential information

1310, 1320, 1330, 2310, 2410 reference image information

1311, 1312, 131m, 1321, 1322, 132m, 1331, 1332, 133m Enlarged image information 1500 Corresponding information table

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a first embodiment will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the image display device 1 in the present embodiment. FIG. 2 is a front view of the image display device 1.

As shown in FIG. 1, the image display device 1 includes a CPU 10 that controls the entire image display device 1, a ROM 11 that stores programs, a RAM 12 that temporarily stores data, a liquid crystal screen or A powerful display unit 2 such as an electronic paper display, an input unit 3, a memory card 13 which is an external storage unit, and a data receiving unit 14 are provided, which are connected to each other via a bus. The memory card 13 is provided with a display image storage unit 131 for storing image information such as document data. The RAM 12 has a display magnification storage unit 121 that stores magnification data indicating display magnifications that can be displayed on the display unit 2, and an image display for temporarily storing image information stored in the display image storage unit 131. A buffer 122 is provided. Note that the display magnification storage unit 121 may be provided in the memory card 13.

As shown in FIG. 2, the display unit 2 displays the image information stored in the image display buffer 122. Based on this, an image such as a document is displayed. The input unit 3 includes a next button 31 and a previous button 32 for performing page operations and the like, and an enlarge button 34 and a reduce button 35 for changing the display magnification.

FIG. 3 is a configuration diagram showing a data structure of the display magnification storage unit 121 of the RAM 12. The display magnification storage unit 121 stores magnification data indicating display magnifications (0) to (m) that can be specified by pressing the enlarge button 34 or the reduce button 35. For example, the display magnification is 100%, 150%, 200%, 300%. In the present embodiment, as will be described later, since image information corresponding to each display magnification is stored, the magnification that can be displayed is fixed.

FIG. 4 is a configuration diagram showing a data structure of the display image storage unit 131 of the memory card 13.

The display image storage unit 131 stores image information corresponding to each display magnification for each document. Here, image information corresponding to a display magnification of 100% is particularly referred to as reference image information, and image information corresponding to other display magnifications is referred to as enlarged image information. For example, for the document with document ID1, reference image information 1310 and display magnification 1 image information 1311, display magnification 2 image information 1312,... Display magnification m image information 131 m are stored as enlarged image information. . Further, for the document with document ID2, reference image information 1320 and display magnification 1 image information 1321, display magnification 2 image information 1322..., Display magnification m image information 132m are stored as enlarged image information. Further, for the document with document ID 3, reference image information 1330 and display magnification 1 image information 1331, display magnification 2 image information 1332... 'Display magnification m image information 133m are stored as enlarged image information.

The display magnification changing process (1) performed in the image display device 1 having the above configuration will be described with reference to FIG.

[0051] As shown in FIG. 5, when the display magnification changing process (1) is started, first, the document ID of the currently displayed document is obtained (Sl).

Then, the image display buffer 122 of the RAM 12 is initialized (S2). Next, magnification data is acquired from the display magnification storage unit 121 (S3).

Next, display magnification candidates are displayed on the display unit 2 so that the user can select the display magnification based on the acquired magnification data (S4). Then, the user presses the enlarge button 34 or the reduce button Press 35 to accept the display magnification input (S5), and select the display magnification based on the input (S6).

Next, image information corresponding to the display magnification selected in S6 of the currently displayed document is acquired from the display image storage unit 131 (S7) and transferred to the image display buffer 122 (S8). . Then, the image information stored in the image display buffer 122 is displayed on the display unit 2 (S9). As described above, it is possible to obtain the display of the image information changed to the display magnification desired by the user.

[0055] When the image information read from the display image storage unit 131 is larger than the display area of the display unit 2, for example, candidates such as upper left, upper right, lower left, lower right, etc. are displayed on the display unit 2. Then, the user may be able to input which part is displayed, or display the default part such as the upper left.

[0056] As described above, according to the present embodiment, image information of an image optimized for the display magnification is stored in correspondence with a preset display magnification, and the display magnification can be changed by the user. Since the image information corresponding to this is read and displayed when it is specified by, it is possible to display a high-quality image that does not require processing time for enlargement / reduction processing.

Next, a second embodiment of the present invention will be described with reference to FIG. 6 (a) to FIG. In this embodiment, instead of storing the enlarged image information itself, the difference information is stored, and the enlarged image information is created based on the reference image information power difference information when the display magnification is designated. .

For example, as shown in FIG. 6 (a) and FIG. 6 (b), the reference image information 500, the corresponding enlarged image information 600 with a display magnification of 200%, and the enlarged image information 700 with a display magnification of 400%. Suppose there is. In this case, the reference image information 500, the difference information 610 representing the difference between the reference image information 500 and the enlarged image information 600, the difference information 710 representing the difference between the reference image information 500 and the enlarged image information 700, and FIG. c) and correspondence information 620 and 720 shown in FIG. 6 (d) are stored in the display image storage unit 131, and the reference image information 500 is used by using the difference information 610 and 710 according to the designated display magnification. Enlarged image information 600 and 700 are generated from the image. Here, the correspondence information refers to the enlarged image information of the display magnification required by each pixel of the reference image information. It shows which coordinate position comes. Correspondence information 620 shown in FIG. 6C is correspondence information between the reference image information 500 and the enlarged image information 600, and correspondence information 720 shown in FIG. 6D is reference information 720 shown in FIG. 6D. It is correspondence information. Such display magnification change processing (2) of this embodiment will be described with reference to FIG. In addition, in the following description, when it is the same as 1st embodiment, the description is used and description is abbreviate | omitted. Also, the same process uses the same step number.

As shown in FIG. 7, first, the document ID of the currently displayed document is acquired (Sl), and the image display buffer 122 of the RAM 12 is initialized (S2). Next, the pixel index i for specifying the pixel of the enlarged image information is initialized to 1 (S33), and the magnification data is acquired from the display magnification storage unit 121 (S3).

Next, display magnification candidates are displayed on the display unit 2 so that the user can select the display magnification based on the acquired magnification data (S4). Then, it accepts that the user presses the enlarge button 34 or the reduce button 35 to input the display magnification (S5), and selects the display magnification based on the input (S6).

Next, the difference information corresponding to the selected display magnification of the currently displayed document is read from the display image storage unit 131 (S37). Then, the correspondence information is acquired from the display image storage unit 131 based on the selected display magnification (S38).

[0062] Next, based on the acquired correspondence information, the pixel value of the reference image information corresponding to the pixel index i is acquired (S39). Next, the difference value of the pixel index i is acquired from the difference information (S40), and the difference value acquired in S40 is added to the pixel value acquired in S39 (S41). Then, the pixel value obtained in S41 is set in the image display buffer 122 (S42).

[0063] Next, it is determined whether or not the value of the pixel index i matches the size (total number of pixels) of the enlarged image information to be obtained (S43). If not (S43: NO), the value of i 1 is added to (S44), the process returns to S39, and the processes of S39 to S43 are repeated.

[0064] If the value of the pixel index i matches the size of the enlarged image information (S43: YES), the image information (enlarged image information) stored in the image display buffer 122 is displayed on the display unit 2 ( S9). As described above, the enlarged image information desired by the user can be generated based on the difference information and displayed. As described above, according to the present embodiment, since the difference information is stored in the display image storage unit 131 instead of the enlarged image information itself, the display image storage is performed even if the corresponding display magnification is large. High-quality images corresponding to each display magnification can be displayed while saving the storage capacity of the unit 131.

Next, a third embodiment of the present invention will be described with reference to FIG. In the second embodiment, the enlarged image information is generated using the correspondence information. However, in this embodiment, in the display magnification change process (3) shown in FIG. Generate.

In this display magnification changing process (3), as shown in FIG. 8, first, the document ID currently being displayed is acquired (Sl). Then, the image display buffer 122 of the RAM 12 is initialized (S2). Next, the pixel index i is initialized to 1 (S33). Next, the magnification data is acquired from the display magnification storage unit 121 (S3).

Next, display magnification candidates are displayed on the display unit 2 so that the user can select the display magnification based on the acquired magnification data (S4). Then, it accepts that the user presses the enlarge button 34 or the reduce button 35 and inputs the display magnification (S5), and selects the accepted display magnification (S6).

Next, differential information corresponding to the display magnification selected in S6 in the currently displayed document is read from the display image storage unit 131 (S37). Then, the reference image information of the currently displayed document is enlarged to the selected display magnification to create enlarged reference image information (S48).

[0070] Next, the value of the i-th pixel of the enlarged reference image information is added to the value of the i-th pixel of the difference information (S50). Then, the pixel value obtained in S50 is set in the image display buffer 122 (S42).

[0071] Next, it is determined whether or not the value of the pixel index i matches the size (total number of pixels) of the enlarged reference image information (S45), and matches the size (total number of pixels) of the enlarged reference image information. Otherwise (S45: NO), the value of i [Calculate this 1 (S46), S50 [Return].

[0072] If the value of the pixel index i matches the size of the enlarged reference image information (S45: Y ES), the difference information is used to change the reference image information from the reference image information to the user's desired display magnification. The enlarged image information stored in the image display buffer 122 is displayed. Displayed in part 2 (S9).

As described above, according to the present embodiment, even if the correspondence information is not used, the enlarged image information corresponding to the selected display magnification is used as the reference by using the difference information that does not cause the correspondence between the pixels to be broken. Image information power can be generated.

Next, a fourth embodiment of the present invention will be described with reference to FIG. Although the difference information between the reference image information and each enlarged image information is stored in the third embodiment, the difference information between the prepared display magnifications is stored in the present embodiment. For example, when there are display magnifications of 100%, 200%, and 300%, difference information between 100% and 200% and difference information between 200% and 300% are stored. Therefore, the image information enlargement process is performed step by step, and the enlargement process is repeated up to the requested display magnification.

Hereinafter, the display magnification changing process (4) in the present embodiment will be described. As shown in FIG. 9, first, the document ID of the currently displayed document is obtained (Sl). Then, the image display buffer 122 in the RAM 12 is initialized (S2). Next, the pixel index i is initialized to 1 (S33). Next, magnification data is acquired from the display magnification storage unit 121 (S3).

Next, display magnification candidates are displayed on the display unit 2 so that the user can select a display magnification based on the acquired magnification data (S4). Then, it accepts that the user presses the enlarge button 34 or the reduce button 35 and inputs the display magnification (S5), and selects the accepted display magnification (S6).

Next, the current display magnification is acquired (S71). Then, a display magnification that is one step larger than the current display magnification acquired in S71 is acquired and set as an enlarged display magnification (S72). Next, based on the enlargement display magnification, the current image information is enlarged to one size larger to create enlarged image information (S73).

Next, difference information corresponding to the enlarged display magnification set in S72 is acquired from the display image storage unit 131 (S74). Next, the value of the i-th pixel in the difference information is added to the value of the pixel in the enlarged image information (S75). Then, the pixel value obtained in S75 is set in the image display buffer 122 (S42).

[0079] Next, it is determined whether or not the power of the pixel index i matches the size of the enlarged image information (S45). If the power of the pixel index i does not match the size of the enlarged image information (S45: NO) ), Add 1 to the value of i (S46), return to S73, and repeat the process.

[0080] Value power of pixel index i If the size of the enlarged image information matches (S45: YES), then whether or not the enlarged display magnification set in S72 is equal to the display magnification selected in S6. Judgment is made (S76). If they are not equal (S76: NO), return to S72. If the selected display magnification is equal (S76: YES), the enlarged image information corresponding to the display magnification desired by the user is stored in the image display buffer 122, and this is displayed on the display unit 2. (S9).

As described above, according to the present embodiment, the difference information is added while generating enlarged image information whose magnification is changed step by step until the selected display magnification is reached without using correspondence information. Thus, it is possible to generate desired enlarged image information without breaking the correspondence between pixels.

Next, a fifth embodiment of the present invention will be described with reference to FIG. In the first embodiment, each enlarged image information has the same layout as the reference image information. However, in the case where the image information is composed only of characters, the display magnification is simply changed. Rather than creating and storing enlarged image information, storing enlarged image information with the character layout changed to fit the display area is more convenient for viewing when read and displayed.

For example, as shown in FIG. 10, when the display area of the display unit 2 has a length L and a width W, the reference image information is enlarged as it is when the enlarged image information is generated based on the reference image information. Instead of enlarging, the enlarged characters are enlarged according to the magnification, and the enlarged characters are created by flowing the enlarged characters into the display area of width W. Then, the enlarged image information created in this way is stored in the display image storage unit 131. When the display magnification change is requested, the display magnification changing process (1) is performed according to the flowchart shown in FIG. 5 of the first embodiment, and the character enlarged to the selected display magnification is processed by the process of S7. The enlarged image information having the width W is read from the display image storage unit 131. Therefore, according to the present embodiment, the user can conveniently read only in the vertical direction without the need to turn the page in the horizontal direction when reading the document.

Next, a sixth embodiment of the present invention will be described with reference to FIGS. 11 to 13. Up In the fifth embodiment, the enlarged image information having the width W is stored in the display image storage unit 131, and is read and displayed on the display unit 2. In this embodiment, the display magnification change instruction If there is, the enlarged image information having the width W is created and displayed as the reference image information power.

For example, as shown in FIG. 11, when the enlarged image information 105 is created based on the reference image information 100, the position of the character displayed on the display unit 2 is the reference image information 100 and the enlarged image information 105. Different. Therefore, in this embodiment, the reference image information 100 is divided into a plurality of areas, and the positional relationship between the reference image information 100 and the enlarged image information 105 is determined in advance for each area, and this is used as correspondence information as a correspondence information table. Remember it in 1500. The correspondence information table 1500 may be provided in the RAM 12 or the like.

[0086] For example, for the region "Muteppo" in the image shown in FIG. 11, for the reference image information 100, display start point coordinates (xl, yl): (50,100), display end point coordinates (x2, For y2) :( 240,170), enlarged image information 105, it is possible to have correspondence information such as display start point coordinates (xl, yl) :( 280,150), display end point coordinates (x2, y2) :( 540,310) .

Next, with reference to FIG. 12, the display magnification changing process (6) for changing the display magnification with reference to the correspondence information table 1500 will be described. First, obtain the document ID currently displayed (Sl). The number of areas in the document is acquired from the acquired document ID (S61). Then, the image display buffer 122 of the RAM 12 is initialized (S2). Next, the area index a is initialized to 1 (S62).

Next, magnification data is acquired from the display magnification storage unit 121 (S3). Next, display magnification candidates are displayed on the display unit 2 so that the user can select the display magnification based on the acquired magnification data (S4). Then, it accepts that the user presses the enlarge button 34 or the reduce button 35 and inputs the display magnification (S5), and selects the accepted display magnification (S6).

Next, difference information corresponding to the selected display magnification is read from the display image storage unit 131 (S37). The difference information used in the present embodiment is the same as that in the third embodiment. Then, the correspondence information corresponding to the area index a is also acquired in the correspondence information table 1500 (S63).

Next, a region enlargement process described later is performed (S64). When the area expansion process is completed, the expanded area The image in the area is set in the image display buffer 122 based on the correspondence information (S65). Next, it is determined whether or not the force corresponding to the number of regions acquired in region index a is the same as the number of regions acquired in S61 (S66). If they do not match (S66: NO), 1 is added to the value of region index a. (S67), return to S63 and repeat the process.

[0091] If the value of the region index a matches the number of regions (S66: YES), the image information stored in the image display buffer 122 is displayed on the display unit 2 (S9).

With reference to FIG. 13, the region enlargement process in S64 will be described. In the area enlargement process, enlarged image information of area a is generated. First, the pixel index j is initialized to 1 (S81), and the difference value corresponding to the jth pixel is acquired from the difference information acquired in S37 of the display magnification change process (6) (S82). Next, the difference value obtained in S82 is added to the pixel value of the reference image information corresponding to the j-th pixel (S83), and this is set in the region enlargement buffer 123 (shown by a dotted line in FIG. 1). (S84).

[0093] Value power of pixel index j It is determined whether or not the power matches the size of the area (number of pixels) (S85). If they do not match (S85: NO), the value of pixel index j is set to 1. Calculate (S86), return to S82, and repeat S82 to S86. If it matches the size of the area (S85: YES), the process returns to the display magnification change process (6).

As described above, according to the present embodiment, by preparing the force correspondence corresponding area table 1500, an enlarged image of the requested display magnification having the width W using the difference information and the correspondence information. Information can be generated and displayed.

Next, a seventh embodiment will be described with reference to FIGS. 14 (a) and 14 (b).

This embodiment is almost the same as the first embodiment, but this embodiment differs from the first embodiment in that a management table 332 as shown in FIG. 14 (a) is used.

The management table 332 is provided in the memory card 13 or the RAM 12, and a document ID 3321, magnification data 3322, and link information 3323 to each image information are prepared as data items. Further, as shown in FIG. 14 (b), only the image information (reference image information and enlarged image information) is stored in the display image storage area 131.

The display magnification changing process of the present embodiment is the same as that in the first embodiment (FIG. 5). However, in this embodiment, in S3, the magnification data is obtained from the display magnification storage unit 121. Then, it is acquired from the management table 332. In S 7, the image information is acquired from the display image storage unit 131 with reference to the management table 332 that is not directly acquired from the display image storage unit 131. This facilitates access to the magnification data and each image information, and the display magnification changing process can be executed at high speed even when the type of display magnification and the number of image information are increased. In addition, management becomes easier when the display magnification type is added.

Next, an eighth embodiment will be described with reference to FIGS. 15 (a) to 18.

[0100] In this embodiment, the enlarged image information is stored in the display image storage unit 131 as divided image information divided into several pieces. For example, as shown in FIG. 15 (a), the enlarged image information 200 is divided into four parts and stored in the display image storage unit 131 as divided image information 201-204.

More specifically, as shown in FIG. 16, the display image storage unit 131 stores n pieces of divided image information for each display magnification other than the reference display magnification. That is, for the document ID1, the reference image information 2310 and the image information corresponding to the display magnification (1) are displayed as follows: display magnification 1 image information (1) 2311, display magnification 1 image information (2) 2312, · · · Display magnification 1 image information (n) n pieces of divided image information of 231n are stored. Also, as image information corresponding to the display magnification (2), the display magnification 2 image information (1) 2321, display magnification 2 image information (2) 2322, ... display magnification 2 image information (n) 232n, n divisions Image information is stored. Furthermore, as image information corresponding to the display magnification (m), the display magnification m image information (1) 23m 1, the display magnification m image information (2) 23m2, · · 'display magnification m image information (n) 23mn, n Pieces of divided image information are stored. For the document with document ID2, the display magnification 1 image information (1) 2411, the display magnification 1 image information (2) 2412,... One piece of image information (n) 241n is stored. Also, as image information corresponding to the display magnification (2), the display magnification 2 image information (1) 2421, the display magnification 2 image information (2) 2422, ··· the display magnification 2 image information (n) 2 42n, n Pieces of divided image information are stored. Further, as image information corresponding to the display magnification (m), the display magnification m image information (l) 24ml, the display magnification m image information (2) 24m2, ... 'display magnification m image information (n) 24mn, n Pieces of divided image information are stored. here Each piece of divided image information forms image information corresponding to the display area by combining a plurality of pieces of divided image information smaller than the display area of the display unit 2. The number n of divided image information is set in advance for each display magnification.

The display magnification changing process (8) of the present embodiment using the divided image information as described above will be described with reference to the flowchart of FIG.

As shown in FIG. 17, when the display magnification change process (8) of the present embodiment is started, first, the document ID of the currently displayed document is acquired (Sl). Then, the image display buffer 122 in the RAM 12 is initialized (S2). Next, magnification data is acquired from the display magnification storage unit 121 (S3).

[0104] Next, display magnification candidates are displayed on the display unit 2 so that the user can select a display magnification based on the acquired magnification data (S4). Then, it accepts that the user presses the enlarge button 34 or the reduce button 35 to input the display magnification (S5), and selects the display magnification based on the accepted input (S6).

Next, initial display area candidates are displayed (S10) _o For example, candidates such as upper left, upper right, lower left, lower right, etc. are displayed. Then, it accepts that the user inputs the initial display area from these candidates (S11).

[0106] Next, variable i is set to the index value corresponding to the initial display area specified in S11.

(S12). For example, 1 is set as the index value in advance if the input initial display area is the upper left, 2 if it is the upper right, 3 if it is the lower left, and 4 if it is the lower right.

<o

Then, among the divided image information corresponding to the display magnification selected in S6, the i-th divided image information is acquired from the display image storage unit 131 (S16). For example, if document ID = 1, display magnification (1), and i is 2, display magnification 1 image information (2) 2312 is acquired (see FIG. 16). Next, the acquired divided image information is transferred to the image display buffer 122 (S8).

Next, it is determined whether or not the i-th divided image information is the last divided image information among the divided image information corresponding to the display magnification selected in S6 of the currently displayed document ( S17). If it is the last divided image information (S17: YES), the process proceeds to S20.

[0109] On the other hand, if it is not the last divided image information (S17: NO), then the display area of display unit 2 is It is determined whether or not the divided image information for one page corresponding to the area has been transferred to the image display buffer 122 (S18). If it is still less than one page (display area) (S18: NO), 1 is added to the variable i (S19), the process returns to S16, and the above processing is repeated.

[0110] On the other hand, if one page (display area) is satisfied (S18: YES), the process proceeds to S20. In S20, the display start position is set to the initial display area specified in S11 (S20), the divided image information stored in the image display nota 122 is displayed on the display unit 2 (S9), and the process is performed. finish.

Thus, image information for one page is created by combining the divided image information according to the display magnification designated by the user, and this is displayed on the display unit 2. As described above, according to the present embodiment, a plurality of pieces of divided image information are combined and displayed so as to be larger than the size of the display area, so that one piece of image information having a size larger than the display area is displayed. The area of the image display buffer 122 can be made smaller than the case of reading. Next, the display area movement processing in the present embodiment will be described with reference to the flowchart of FIG. The display area moving process is a process for moving the display image area according to a user instruction after the display magnification is changed by the display magnification changing process.

First, an input of an instruction to move the display image area is received from the input unit 3 (S51). An instruction to move the display image area is made by pressing the next button 31 or the previous button 32, for example. Next, the set value of the area movement amount is acquired from the RAM 12 (S52). Next, the image information obtained by moving the screen display area by the set value obtained in S52 is stored in the image display buffer 122 (S53). Then, based on the image information stored in the image display buffer 122, an image is displayed (S54), and the process is terminated.

[0113] In this embodiment, instead of combining and displaying a plurality of pieces of divided image information, one division corresponding to the region designated in S11 by the user is performed without performing steps S17 to S19. Only image information may be transferred to the image display buffer 122 for display. In this case, as shown in FIG. 15 (a), the enlarged image information 200 is not simply divided, but as shown in FIG. 15 (b), an overlapping area is provided in each piece of divided image information to provide a divided image. Information 211 to 214 may be used. For example, as shown in FIG. The right end area 215 of 211 and the left end area 216 of the divided image information 212 are overlapped areas. Similarly, the lower end area 219 of the divided image information 211, the upper end area 221 of the divided image information 213, the right end area 217 of the divided image information 213, the left end area 218 of the divided image information 214, and the lower end of the divided image information 212. The region 220 and the region 22 2 at the upper end of the divided image information 214 are overlapping regions. In this way, if an overlapping area is provided for each piece of divided image information, even if characters are cut off due to the edge of the divided image information, the previous piece of divided image information is displayed. The last edge of the divided image information is displayed so that the characters can be displayed easily.

[0114] Even when the divided image information is used as in the present embodiment, the management table can be used as in the seventh embodiment. In this case, a management table 1332 as shown in FIG. 14 (c) is used. The management table 1332 contains, as data items, document HD information 3321, magnification data 3322, link information to image information on page 1 3324, link information to image information on page 2 3325, link to image information on page 3 Information 3326, link information 3327 to page 4 image information is prepared, and each display magnification and the file name of the image information corresponding to each page are stored.

Furthermore, as shown in FIG. 14 (d), the display image storage unit 131 stores only image information (reference image information and divided image information). As in the case of the seventh embodiment, this makes it easy to access the magnification data and each image information, and executes the display magnification changing process at high speed even if the type of display magnification and the number of image information increase. be able to.

Next, a ninth embodiment of the present invention will be described with reference to FIG. When a document is displayed like a portable electronic book, it is desirable that the display area can be displayed with as little waste as possible even when the display magnification is changed. Therefore, in the present embodiment, the display magnification is set to an integer multiple in advance, and image information for one page of the display area is configured by one piece of divided image information.

For example, as shown in FIG. 19, when displaying the enlarged image information 200 having a display magnification of 2 times with respect to the reference image information 100, the divided image information 201 is displayed on the second page. The divided image information 202 is displayed, the divided image information 203 is displayed on the third page, and the divided image information 204 is displayed on the fourth page. It also has a 3x display magnification In the case of the image information 300, the divided image information 301 is displayed on the first page, the divided image information 302 is displayed on the second page, the divided image information 303 is displayed on the third page, and the divided image information 304 is displayed on the fourth page. The fifth page contains divided image information 305, the sixth page contains divided image information 306, the seventh page contains divided image information 307, the eighth page contains divided image information 308, and the ninth page. The split image information 309 is displayed in the full display area. As a result, there is no useless margin on the right side, which is suitable for browsing.

[0118] Next, a tenth embodiment of the present invention will be described. In the present embodiment, as shown in FIG. 10, the enlarged image information created in accordance with the width W of the display unit 2 is divided by the length L to obtain divided image information, which is stored in the display image storage unit 131. Keep it. In this case, display magnification change processing (8) may be performed according to the flowchart of the eighth embodiment (FIG. 17). Here, the divided image information is created in advance in accordance with the display area having the width W and the length L, so that the divided image information for one page is read in S16. Therefore, the divided image information transferred to the image display buffer 122 may be displayed on the display unit 2 while omitting the steps S17 to S19.

[0119] Further, in the case of a document including such characters, it is more convenient to create image information by dividing the document along the direction in which the text flows. For example, as shown in Fig. 20 (a), horizontal writing is divided vertically along the flow of text, while in vertical writing, the flow of text is shown as shown in Fig. 20 (b). It is good to divide horizontally along.

Next, an eleventh embodiment of the present invention will be described with reference to FIGS. 21 (a) to 21 (c). In the present embodiment, the divided image information created in accordance with the aspect ratio of the display unit 2 is rotated and stored in the display image storage unit 131. When displaying, the user can rotate the image display device 1 by 90 degrees and view the image.

[0121] For example, as shown in FIG. 21 (a), if the reference image information 100 has a size of 800 in the vertical direction and 600 in the horizontal direction, first, the enlarged image information 300 having the vertical length of 1040 and 800 in width is generated. It is rotated 90 degrees and stored as two pieces of divided image information 301 and 302 having overlapping areas. With this configuration, when the reference image information is displayed, it can be viewed as shown in FIG. 21 (b), and when the enlarged image information is displayed, it can be viewed as shown in FIG. 21 (c), and the display area moves in one direction. It is convenient because it can be browsed only.

Next, a twelfth embodiment of the present invention will be described with reference to FIG. 22 and FIG. In the first embodiment, the image information is stored as it is in the display image storage unit 131, and is read out and displayed on the display unit 2. In the present embodiment, each image information is compressed to be compressed information. Is stored in the display image storage unit 131, and the compressed image is expanded and displayed when displayed on the display unit 2.

[0123] The compressed information is generated in advance by performing compressed image creation processing using a personal computer (not shown) or the like. Here, a run length compression method is used. Such compressed image creation processing will be described with reference to FIG. In the compressed image creation process, a counter i is used as a variable indicating the number of pixels having the same gradation, and a pixel variable pixel is used as a variable indicating the gradation. First, the counter i is initialized to 1 (S100). Next, the pixel variable pixel is initialized (S 101). Next, the original image information to be compressed is read (S102). Then, information about which display magnification of the compressed image information is to be created is acquired (S103).

Next, the code length of the encoded data after run length compression is acquired based on the display magnification acquired in S 103 (S 104). For example, the code length of the reference image information with a display magnification of 100% is 6 bits when the display magnification is 200%, and 7 bits when the display magnification is 300%. It is determined in advance. Also, the encoded data is composed of an area that represents a gradation value and an area that represents the number of pixels of continuous gradation. For example, for encoded data with a code length of 6 bits that has been compressed to a display magnification of 200%, the tone value (pixel variable pixel value) is the first 2 bits, and the remaining 4 bits are continuous tone pixels. (Counter i value) is stored. Similarly, for code data with a code length of 7 bits that has been compressed to a display magnification of 300%, the tone value (pixel variable pixel value) is the first 2 bits, and the remaining 5 bits are continuous tone values. The number of pixels (counter i value) is stored. The code length at each magnification is an example and is not limited to this.

Next, the gradation value of the i-th pixel is acquired from the original image information, and this is set to the pixel variable pixel (S 105). Next, it is determined whether or not the value of the pixel variable pixel is the same as the gradation value of the previous pixel (S106). If they are the same (S106: YES), it is next determined whether or not they fall within the range that can be expressed by the code length acquired by the value power S104 of the counter i (S107). For example, when generating compressed image information with a display magnification of 200%, the value of the counter i can be expressed by 4 bits of the code length of 6 bits, excluding 2 bits indicating the gradation value. That is, 0 to 15 for 4 bits Since the number up to can be expressed, it is determined whether the value of counter i is 15 or less. If it is within the range that can be expressed by the code length (S107: YES), 1 is added to the value of counter i and the process proceeds to S111.

[0126] If the value of the pixel variable pixel is not the same (S106: NO), or if the value of the counter i exceeds the range that can be expressed by the code length (S107: NO), then the pixel variable The value of pixel and the value of force counter i are output and stored in predetermined storage means (S109). For example, when generating compressed image information with a display magnification of 200%, the sign key data in which the value of the pixel variable pixel is stored in 2 bits and the counter i is stored in the remaining 4 bits is stored in a predetermined storage means. Output and store. Then, the value of counter i is initialized to 1 (S110), and the process proceeds to S111.

[0127] In S111, it is determined whether or not the above processing for all the pixels is completed, that is, whether or not more pixels can be read (S111). If the pixel is still readable (Sl l l: NO), return to S105 and repeat the process. If the pixel cannot be read (S11 1: YES), the process is terminated.

[0128] The encoded data (compression information) obtained in this way is stored in the display image storage unit 131. In order to display the image information according to the user's request from the compression information created in this way on the display unit 2, in each display magnification change process described above, the image information from the display image storage unit 131 is displayed in S7. The following pressure image image expansion processing is required when reading

[0129] The compressed image expansion processing will be described with reference to FIG. As shown in FIG. 23, first, a pixel variable pixel and a counter count are initialized (S120). Next, a decompression destination buffer (not shown) for decompressing the compressed image provided in the RAM 12 is initialized (S121).

Next, the selected display magnification is acquired (S122). Then, the compression information corresponding to the display magnification is acquired (S123). Next, the code length of the random compression is acquired based on the display magnification acquired in S122 (S124). Here, the code length is obtained by the reverse procedure of the method of S104 in FIG. 22 described above.

[0131] Next, encoded data corresponding to the code length is acquired from the compression information acquired in S123. (S125) _{0 In other} words, a value indicating the gradation value and the number of consecutive pixels having the same gradation are acquired. Next, the acquired gradation value is counted in the pixel variable pixel, and the number of consecutive pixels of the same gradation is counted. Set to count (S126). Then, 0 is assigned to variable i (SI 27).

Next, it is determined whether or not the variable i is smaller than the value of the counter count (S128). If small

(S128: YES), the value of the image variable pixel is added to the development destination buffer (S129), and 1 is added to the variable i (S130). Then, the process returns to S128 and repeats the process.

[0133] If the variable i is not smaller than the value of the counter count (S128: NO), it is determined whether or not the encoded data can be read any more (S131). If it can still be read (S131: NO), SI Return to 25 and repeat the process. If it can no longer be read (S131: YES), the compressed image expansion processing is terminated.

As described above, according to the present embodiment, the compression information is stored as the image information, and the code length is set based on the display magnification information. The image information can be used with high compression efficiency.

[0135] By the way, all of the above embodiments can be similarly considered in the case of force reduction with the case of enlargement in mind. In the case of reduction, as a specific process, thumbnail display can be performed instead of simply storing and displaying the reduced image information. A thirteenth embodiment for executing such thumbnail display will be described with reference to FIGS.

As shown in FIG. 24, when the display magnification change process (13) of this embodiment is started, first, the document ID of the currently displayed document is acquired (Sl). Then, the image display buffer 122 of the RAM 12 is initialized (S2). Next, magnification data is acquired from the display magnification storage unit 121 (S3).

[0137] Next, display magnification candidates are displayed on the display unit 2 so that the user can select the display magnification based on the acquired magnification data (S4). Then, it accepts that the user presses the enlarge button 34 or the reduce button 35 and inputs the display magnification (S5), and selects the accepted display magnification (S6).

[0138] Next, the selected display magnification is reduced display, and thumbnail display is designated! It is determined whether or not (S56). If thumbnail display is not specified (S56: NO), image information corresponding to the selected display magnification is retrieved from the display image storage unit 131 and loaded (S7), and transferred to the image display buffer 122. (S8). To specify thumbnail display, For example, it can be performed by the user operating the input unit 3 according to the display on the display unit 2.

On the other hand, when thumbnail display is designated (S56: YES), a thumbnail page generation process described later is executed (S67). Then, the generated thumbnail page is transferred to the image display buffer 122 (S8), and the image information stored in the image display buffer 122 is displayed on the display unit 2 (S9). As described above, even a thumbnail page can be displayed with the display magnification changed to the display magnification desired by the user.

Next, with reference to FIG. 25, the thumbnail page generating process executed in the display magnification changing process (13) of FIG. 24 will be described. When the thumbnail page generation process is started, first, the number of thumbnails to be displayed on one page is acquired (S203). The number of thumbnails displayed on a page is determined according to the display magnification.

Next, a margin value margin_x in the X direction and a margin value marginJ in the y direction are acquired (S 204). The margin value is determined in advance corresponding to the display magnification. Here, the total value of the thumbnail image width and the space between thumbnails in the X direction is set as the margin value in the X direction margin_x, and the total value of the height of the thumbnail image and the space between thumbnails in the y direction is set in the y direction. Set margin value margin j as! /

[0142] Next, the index i of the thumbnail image to be generated is initialized to 0, and the document ID acquired in S1 is substituted for the page status page (S205). Next, the page position index X is initialized to 0, and the page position index y is initialized to margin j (S206). Note that the page position indexes X and y indicate the coordinates of the lower right corner point of the thumbnail image. The upper left point of the display area is the origin.

Then, the image information corresponding to the selected display magnification and page index page is read from the display image storage unit 131 (S207). Next, the margin value x in the X direction is added to the page position index X (S208). Then, a thumbnail arrangement position determination process is performed for the image information (S209).

[0144] Thumbnail arrangement position determination processing will be described with reference to FIG. As shown in FIG. 26, when the thumbnail arrangement position determination process is started, first, it is determined whether or not the value of the index y is less than the height of the storage buffer (S232). Height of storage buffer (not shown) If it has reached (S232: NO), error processing for storage location overflow error is executed (S233), and the process returns to thumbnail generation processing.

[0145] If the value of the page position index y is less than the height of the storage buffer (S232: YES), it is determined whether the value of the page position index X is less than the width of the storage buffer (S2 35). If the value of the page position index X is less than the width of the storage buffer (S235: YES), the process returns to the thumbnail page generation process.

[0146] If the value of the page position index X has reached the width of the storage buffer (S235: NO), the margin value margin j is added to the index y to place the thumbnail in the next level (S237 ). That is, y = y + margin_y. Next, the index x is initialized to margin_x (S238), and the process returns to the thumbnail page generation process.

[0147] Once the thumbnail arrangement position is determined in this way, it is next determined whether an error occurred in relation to the thumbnail storage position (S210). If an error occurs (S210: YES), the process directly returns to the display magnification change process (13). If no error has occurred (S210: NO), the image information acquired in S207 is arranged as a thumbnail image at the designated position in the display area determined in S209 (S211).

[0148] Next, 1 is added to the index i of the thumbnail image and the page index page (S212). Next, it is determined whether the value of the page index page has reached the total number of documents stored in the display image storage unit 131! /, Or not (S213). If the total number of documents has been reached! / No (S213: YES), it is next determined whether the number of thumbnails acquired in the index value S203 of the thumbnail image has been reached (S214). If the value of i has reached the number of thumbnails! /? (S 214: YES), return to S207.

[0149] When the value of the page index page reaches the total number of documents (S213: NO), or when the value of i reaches the number of thumbnails (S214: NO), the display magnification change processing (13 Return to)

[0150] Thus, according to the present embodiment, when a reduction ratio is selected, a plurality of thumbnail images with a display magnification desired by the user can be displayed on one screen, and the overall configuration can be reduced. Easy to grasp.

[0151] The present invention is not limited to the above-described embodiments, and is described in the claims. Various modifications and improvements are possible within the range.

Industrial applicability

The image display device of the present invention can be used for an electronic book or a portable web browser.

Claims

The scope of the claims

[1] Display means for displaying images (2),

First storage means (131) for storing first information;

A reading means (10) for reading the first information from the first storage means (131), and an image with a uniform magnification on the display means (2) based on the first information read by the reading means (10). Display control means (10) for displaying

An image display device (1) comprising a magnification selection means (3) for selecting a display magnification, wherein the first storage means (131) stores reference image information of a reference display magnification as the first information. Along with the second information corresponding to each display magnification different from the standard display magnification,

The reading means (10) stores second information corresponding to the selected display magnification when the display magnification different from the reference display magnification is selected by the magnification selection means (3). Read from means (131),

The display control means (10) displays an image with a uniform magnification on the display means (2) based on the second information read by the reading means (10). 1).

2. The image display device (1) according to claim 1, wherein the second information is corresponding image information corresponding to each display magnification different from the reference display magnification.

[3] When the corresponding image information read by the reading means (10) is larger than the display area size of the display means (2), the display control means further includes a display area specifying means for specifying an area, (10) is characterized in that, of the images based on the corresponding image information read by the reading means (10), the area specified by the display area specifying means is displayed on the display means (2). The image display device (1) according to claim 2.

[4] A display image specifying means is further provided,

The corresponding image information (200) includes a plurality of pieces of divided image information (201 to 204) having a display area size equal to or smaller than the display means (2).

The display image designating means is a shift between! / Of a plurality of divided image information (201 to 204) of the corresponding image information (200) corresponding to the display magnification selected by the magnification selection means (3). One is specified,

The reading means (10) reads the divided image information (201-204) specified by the display image specifying means from the first storage means (131),

The display control means (10) causes the display means (2) to display an image based on the divided image information (201-204) read by the reading means (10). The image display device (1) described.

[5] The image display according to claim 4, wherein the image displayed based on the divided image information (211 to 214) has an overlapping area (215 to 220) overlapping between the images. Device (1).

6. The image display device (1) according to claim 4, wherein the display magnification different from the reference display magnification is an integer multiple of the reference display magnification.

[7] The first storage means (131) stores the divided image information (301, 302) in a state rotated by 90 ° with respect to the reference image information (100). The image display device described in 4 (1).

[8] A display image specifying means is further provided,

The corresponding image information (200) is composed of a plurality of pieces of divided image information (201 to 204), each of which is smaller than the display area size of the display means (2).

The display image designation means designates two or more pieces of divided image information (201 to 204) among a plurality of pieces of divided image information of the display magnification corresponding image information (200) selected by the magnification selection means (3). Is what

The reading means (10) reads all the divided image information (201 to 204) designated by the display image designation means from the first storage means (131),

The display control means (10) displays the composite image on the display means (2) based on all pieces of divided image information read by the reading means (10). Image display device (1).

[9] Management information indicating the correspondence between the display magnification and the first information and the second information (332,

1332) is further provided with second storage means (12, 13),

The reading means (10) is based on the management information (332, 1332) and the magnification selecting means The image display device (1) according to claim 2, wherein the first information or the second information corresponding to the display magnification selected in (3) is read.

[10] The corresponding image based on the second information includes a reference image based on the first information and a first direction.

(W) has the same width, has a different length in the second direction (L) perpendicular to the first direction, and the character size in the corresponding image is different from the character size in the reference image. The image display device (1) according to claim 2, wherein

[11] Further comprising code length determination means (10) for determining the code length of the compression information based on the display magnification selected by the magnification selection means (3),

The corresponding image information is compression information,

The image display device (1) according to claim 2, wherein the code length determining means (10) determines a longer code length as the selected display magnification is larger.

[12] The display control means (10) displays the thumbnail image on the display means (2) based on the corresponding image information read by the reading means (10). The image display device (1) described.

[13] Third storage means (131) storing correspondence information (620, 720) is further provided,

The second information is difference information (610, 710) provided corresponding to each display magnification different from the reference display magnification, and indicating a difference value in each pixel,

The correspondence information (620, 720) is information indicating a correspondence relationship between each pixel in the reference image information and each pixel in the difference information,

The reading means (10)

Difference information reading means (10) for reading difference information (610, 710) corresponding to the display magnification selected by the magnification selection means (3) from the first storage means (131);

Based on the correspondence information (620, 720), the pixel value of the reference image information corresponding to the pixel value of the difference information (610, 710) read by the difference information reading means (10) Display image information generating means for generating display image information by adding, and

The display control means (10) displays an image with a uniform magnification on the display means (2) based on the display image information generated by the display image information generation means. The image display device (1) according to claim 1, wherein:

[14] The second information is difference information (610, 710) provided corresponding to each display magnification different from the reference display magnification, and indicating a difference value in each pixel,

The reading means (10)

Magnification image information generation means for generating magnification image information corresponding to the display magnification selected by the magnification selection means (3) from the reference image information;

Display image information is generated by adding the value of each pixel of the magnification image information corresponding to the value of each pixel of the difference information (610, 710) read by the difference information reading means (10). Display image information generating means,

The display control means (10) is characterized by causing the display means (2) to display an image with a uniform magnification based on the display image information generated by the display image information generation means. The image display device as described (1).

[15] Fourth storage means (121) for storing magnification data indicating a plurality of different display magnifications is further provided,

The image display device (1) according to claim 1, wherein the magnification selection means (3) selects one display magnification from the plurality of different display magnifications.

[16] Display means (2) for displaying an image;

Reading means (10) for reading the first information which is the reference image information of the reference display magnification from the external storage means (13);

Display control means (10) for causing the display means (2) to display an image with a uniform magnification based on the first information read by the reading means (10);

An image display device (1) comprising a magnification selection means (3) for selecting a display magnification, wherein the reading means (10) has a display magnification different from the reference display magnification by the magnification selection means (3). When selected, the second information corresponding to the selected display magnification is read from the external storage means (13),

The display control means (10) is based on the second information read by the reading means (10). Then, an image display device (1) characterized in that the display means (2) displays an image with a uniform magnification.

An image display program for causing a computer to function as various processing means of the image display device (1) according to any one of claims 1 to 16.