JP4730509B2 - Image display device, image display method and program thereof - Google Patents

Description

  The present invention relates to an image display device that continuously displays images corresponding to a plurality of pages included in an image file.

For example, Patent Document 1 discloses a data device that displays electronic data having a plurality of pages together with a thickness corresponding to the number of pages. As a result, it is possible to perform a page search in electronic data with the same feeling as when an actual document is fluttering.
JP 2003-157134 A

  The present invention has been made from the above-described background, and an object thereof is to provide an image display device that facilitates browsing of an image file composed of a plurality of pages.

[Image display device]
In order to achieve the above object, an image display device according to the present invention is an image display device that displays an image file composed of a plurality of pages, and performs page turning and page images corresponding to each page of the image file. Continuous display means for continuously displaying, stop operation accepting means for accepting a stop operation for stopping page feed and displaying a desired page, and when the stop operation is accepted by the stop operation accepting means, The number of pages returned in the direction opposite to the direction displayed by the continuous display means according to an instruction from the outside , with the page corresponding to the page image displayed at the timing when the stop operation is received as a reference page Storage means for storing the number of pages obtained by applying a Kalman filter to the number of pages stored in the storage means from the reference page Tsu and the pages have a page determining means for determining as the page to be displayed, and a page display means for displaying a page determined by the page determining means.

[Image display method]
The image display method according to the present invention is an image display method for displaying an image file composed of a plurality of pages, and continuously displays page images corresponding to each page of the image file while performing page turning. When a stop operation for stopping the page feed and displaying a desired page is received, and the stop operation is received, a page corresponding to the page image displayed at the timing when the stop operation is received is displayed. As the reference page , the number of pages returned in the direction opposite to the continuously displayed direction is stored according to an instruction from the outside, and from the reference page, only the number of pages obtained by applying the Kalman filter to the stored number of pages The returned page is determined as the page to be displayed, and the page determined as the page to be displayed is displayed.

[program]
Further, the program according to the present invention includes a step of continuously displaying page images corresponding to each page of the image file while performing page turning in an image display device that displays an image file composed of a plurality of pages. A step of accepting a stop operation for stopping a feed and displaying a desired page; and when the stop operation is accepted, a page corresponding to the page image displayed at the timing when the stop operation is accepted As a reference page , a step of storing the number of pages returned in the direction opposite to the continuously displayed direction according to an instruction from the outside, and a page obtained by applying a Kalman filter to the stored number of pages from the reference page pages returned by the number, and determining as the page to be displayed, a page to be displayed And a step of displaying the determined page on the image display device.

  According to the image display device of the present invention, it is easy to browse an image file composed of a plurality of pages.

[Background and outline]
First, in order to help understanding of the present invention, the background will be described.
When finding a desired page in a document such as a dictionary, the viewer looks at each page (number of pages, title, index, etc.) while turning the pages of the document at a high speed, and searches for the desired page. . Even if the search target is an electronic document (hereinafter referred to as an electronic document), by applying page feed as described above, the viewer can search a desired page from the electronic document at high speed.
Further, in order to realize a fast and comfortable page search, it is desirable to have a function of automatically turning pages sequentially (hereinafter referred to as an automatic page feed function). However, there is a particular problem when implementing an automatic page feed function for an electronic document.

FIG. 1 is a diagram illustrating a display screen on which an electronic document is displayed.
In order to realize an automatic page feed function for an electronic document, a user interface for instructing start and stop of the automatic page feed function is required as illustrated in FIG. In this example, in addition to the content display unit 262 displaying a summary image (page image) corresponding to each page of the electronic document, a forward page feed start button 264 for starting forward automatic page feed, Reverse page turning start button 266 for starting automatic page turning, a forward page turning button 268 for feeding pages forward by one page, a backward page turning button 270 for feeding pages backward by one page, and A page feed stop button 272 for stopping automatic page feed is provided on the display screen 260.
For example, the viewer can start or stop the automatic page feed by clicking an area in which these buttons are displayed, and the content display unit 262 displays an electronic document in accordance with the click operation of the viewer. Summary images corresponding to the pages are continuously displayed. Here, the summary image is an image reminiscent of each page of the electronic document, and it is desirable that the data amount be suppressed to such an extent that high-speed display is possible.
The viewer can also change the displayed page by page by clicking the forward page turning button 268 or the backward page turning button 270.

  However, it is troublesome to move the pointer and click a predetermined area each time automatic page feed is started or stopped. When automatic page feed is to be stopped immediately after the automatic page feed is started, the pointer is displayed from the display position of the forward page feed start button 264 or the reverse page feed start button 266 to the display position of the page feed stop button 272. It takes a certain amount of time to move and click, and automatic page feed may not be stopped at a desired timing.

In view of this, the image display device 2 according to the present embodiment arranges the user interface for starting automatic page feeding and the user interface for stopping automatic page feeding at substantially the same position. More specifically, as illustrated in FIG. 1B, the image display device 2 is configured to start automatic page feeding by clicking the forward page feed start button 264 or the backward page feed start button 266. In addition, the page feed start button (forward page feed start button 264 or reverse page feed start button 266) is switched to the page feed stop button 272. In addition, when the page feed stop button 272 is clicked and the automatic page feed is stopped, the image display device 2 displays the page feed stop button 272 as a page feed start button (forward page feed start button 264 or reverse page feed). Switch to the feed start button 266).
Thus, the viewer can perform an automatic page feed start operation and a stop operation without moving the pointer.

Further, as described above, even if the page feed start button and the page feed stop button are provided at substantially the same position, the browsing is not performed until the page feed is stopped after the desired page is displayed. Due to the physiological response time of the person and the response time of the image display device 2, a time lag occurs, and the page is sent to some extent before the page feed is stopped. The viewer can correct the displayed page by clicking the forward page turning button 268 or the backward page turning button 270. However, when page turning is performed at high speed, the page turning is performed. A large number of pages are sent before the page is stopped, and page correction is troublesome.
Therefore, the image display apparatus 2 according to the present embodiment uses a predetermined number of pages in a direction opposite to the automatic page feed based on the page (hereinafter referred to as a reference page) displayed at the timing when the operation on the page feed stop button is detected. Just display the returned page. More specifically, the image display device 2 stores the correction amount of the page made by the viewer as a page correction history, and displays a page returned from the reference page by the number of pages corresponding to the page correction history.

FIG. 2 is a diagram illustrating a page correction history.
As illustrated in FIG. 2, the image display device 2 calculates the number of pages automatically corrected with reference to the reference page (automatic correction amount) and the number of pages corrected thereafter by the viewer (manual correction amount). Store as page correction history.
The manual correction is performed, for example, by a user's click operation on the forward page turning button 268 or the backward page turning button 270, and when a desired page is found, the confirmation button 274 (FIG. 1) is clicked. .
The image display apparatus 2 of the present example stores the number of pages changed between when automatic page feed is stopped and when the confirmation button 274 is clicked as a manual correction amount.
The image display device 2 statistically determines the automatic correction amount based on the automatic correction amount and the manual correction amount (that is, the page correction history) stored in this way.
As described above, the image display device 2 according to the present embodiment automatically corrects the page to be displayed based on the page correction history, so that the manual correction amount to be corrected by the viewer can be reduced.

[Embodiment]
Next, the configuration of the image display device 2 in the present embodiment will be described.
FIG. 3 is a diagram illustrating a hardware configuration of the image display apparatus 2 according to the present invention.
As shown in FIG. 3, the image display device 2 includes a control device 20 including a CPU 202 and a memory 204, a communication device 22, a recording device 24 such as an HDD / CD device, an LCD display device or a CRT display device, a keyboard, It includes a user interface device (UI device) 26 including a touch panel.
For example, the image display device 2 is a general-purpose computer or the like, and can request the printer device 10 to print an image or scan a document image via a network.

[Browsing program]
FIG. 4 is a diagram illustrating the configuration of the browsing program 5 that is executed by the control device 20 (FIG. 2) and implements the image display method according to the present invention.
As shown in FIG. 4, the browsing program 5 includes a data acquisition unit 500, a partial data selection unit 510, a decryption unit 520, a continuous display unit 530, a UI control unit 540, a page determination unit 550, a history database (history DB) 560. And a content display portion 570.
The browsing program 5 is supplied to the control device 20 via, for example, the recording medium 240 (FIG. 2) or the network, loaded into the memory 204, and executed.

  In the browsing program 5, the data acquisition unit 500 acquires a data file of an electronic document to be browsed from the printer device 10 (FIG. 3) or the recording device 24 (FIG. 3). The data acquisition unit 500 of this example reads code data of an electronic document composed of a plurality of pages from the recording device 24. Note that the data acquisition unit 500 may acquire a data file of an electronic document via the communication device 22 (FIG. 3).

  The partial data selection unit 510 selects some data files for each page from the data files acquired by the data acquisition unit 500 and outputs the selected data files to the decoding unit 520. For example, when automatic page feed is performed, the partial data selection unit 510 selects a part of the code data for each page from the code data of the electronic document (one divided in the image area, one divided in the frequency) , Bit plane divided, etc.) is selected and output to the decoding unit 520. When automatic page feed is stopped, the page of the page to be displayed is selected from the code data of the electronic document. All code data is selected and output to the decoding unit 520.

  The decoding unit 520 decodes the code data input from the partial data selection unit 510 and outputs it to the continuous display unit 530 or the content display unit 570. For example, when automatic page feed is performed, the decoding unit 520 decodes only a part of the code data for each page of the electronic document, and outputs the decoded data (partial data) to the continuous display unit 530. When output and automatic page feed is stopped, all code data of the electronic document or all code data of the displayed page is decoded, and the decoded data (whole data) is displayed as a content display section. 570 is output.

  The continuous display unit 530 creates a summary image (page image) that recalls each page of the electronic document based on the partial data input from the decryption unit 520 when instructed to perform automatic page turning. The created summary image is continuously displayed on the UI device 26 while page turning. Note that the continuous display unit 530 may continuously display each page of the electronic document as a summary image (page image).

  The UI control unit 540 receives a browser operation and outputs an instruction to the partial data selection unit 510 or the page determination unit 550 in accordance with the browser operation. For example, when the UI control unit 540 receives an operation for starting automatic page feed (for example, a click operation of the forward page feed start button 264 (FIG. 1) or the reverse page feed start button 266 (FIG. 1)), The data selection unit 510 is instructed to select partial data, and automatic page feed is started. Further, when the UI control unit 540 receives an operation for stopping automatic page feeding (for example, a click operation of the page feed stop button 272 (FIG. 1)), the UI control unit 540 indicates the timing at which this operation is received to the page determination unit 550. Instructs the decision of the page to be notified and displayed. When UI controller 540 receives an operation for instructing to display a desired page (for example, a click operation of forward page turning button 268 or backward page turning button 270), partial control unit 510 receives partial data selection unit 510. Instruct to select all code data of the indicated page.

  When the UI control unit 540 receives an operation for starting automatic page feeding or an operation for stopping automatic page feeding, the UI control unit 540 switches the functions of these operation areas. That is, when the UI control unit 540 receives an operation for starting automatic page feeding, the UI control unit 540 switches the operation area in which this operation has been accepted to an operation area for accepting an operation for stopping automatic page feeding, and stops automatic page feeding. When an operation to be performed is accepted, the operation area in which the operation is accepted is switched to an operation area that accepts an operation for starting automatic page feed.

  The page determination unit 550 determines a page to be displayed based on the timing at which an operation for stopping automatic page feeding is received, and instructs the partial data selection unit 510 to display the determined page. More specifically, the page determination unit 550 corresponds to the summary image (page image) displayed by the automatic page feed (continuous display unit 530) at the timing when the operation to stop the automatic page feed is received. Is a reference page, and a page that is moved from the reference page by a predetermined automatic correction amount in a direction opposite to the automatic page feed direction is determined as a page to be displayed.

  The history DB 560 stores information about page changes made after automatic page feed is stopped as a page correction history. For example, as illustrated in FIG. 2, the information related to the page change includes the number of pages automatically corrected by the page determination unit 550 (automatic correction amount) and the number of pages manually corrected by the viewer (manual correction amount). ).

The page determination unit 550 determines an automatic correction amount based on the page correction history stored in the history DB 560. For example, the page determination unit 550 automatically calculates the average value or mode value of the previous page correction amounts (sum of the automatic correction amount and the manual correction amount) based on the page correction history stored in the history DB 560. Determine as. Further, the page determination unit 550 may determine the average value or mode value of the N most recent (N is an integer) page correction amounts as the automatic correction amount.
The page determination unit 550 may calculate the automatic correction amount each time automatic page feed is stopped, or calculate the automatic correction amount when automatic page feed is stopped a predetermined number of times. It may be. Further, the page determination unit 550 may calculate the automatic correction amount by prediction based on the page correction history stored in the history DB 560 by applying, for example, a Kalman filter.
Note that the page determination unit 550 may apply a predetermined fixed value as the automatic correction amount regardless of the page correction history.

  The content display unit 570 displays the image of the page determined by the page determination unit 550 on the UI device 26 based on the entire data input from the decoding unit 520 when the automatic page feed is instructed to stop. Let In addition, the content display unit 570 receives the instruction to display a desired page (for example, when the forward page turning button 268 or the backward page turning button 270 is clicked), the decoding unit 520. The UI device 26 displays an image of the page instructed by the viewer on the basis of the entire data input from.

[Partial data]
Next, partial data selected by the partial data selection unit 510 will be described.
The partial data desirably has a data amount as small as possible in order to speed up the display of the page image in the automatic page feed. In addition, since the summary image is created based on the partial data, the partial data is preferably image data that displays information that recalls the contents of each page.
Therefore, the data acquisition unit 500 in the present embodiment acquires code data of image data configured with a layer structure, and the partial data selection unit 510 selects codes of some layers from the code data of a plurality of layers. Select data only.

There are mainly two types of methods for managing images in a layer structure. One is a method (hereinafter referred to as a multi-mask method) in which image data is composed of an image layer to which multi-value image elements are assigned and at least one mask layer to which binary image elements are assigned. One is an MRC (Mixed Raster Content) method in which image data is composed of two or more image layers to which multi-valued image elements are assigned, and a selection layer for selecting an image element to be output for each image area from these image layers. It is. Here, layers such as an image layer and a mask layer constitute one image by overlapping each other, and a relative positional relationship (overlapping position, etc.) is defined in advance between a plurality of layers.
By managing an image divided into a plurality of layers in this way, it is possible to apply a compression method according to the data characteristics of the image elements (gradation change characteristics, etc.) included in each layer, and efficient compression is possible. is there. For example, reversible run-length compression or LZ compression is applied to mask layers or selection layers composed of image elements whose number of possible gradations is less than or equal to a predetermined value (for example, images with a binary gradation of possible gradations). (Ziv-Lempel coding) etc., and for image layers composed of image elements whose number of possible gradations is larger than the default value (for example, an image that changes gradations in 256 gradations) Apply lossy JPEG (Joint Photographic Coding Experts Group) compression. Since the mask layer, the selection layer, and the like are configured with an image having a small number of gradations, a sufficiently high compression rate can be realized even by lossless compression such as run-length compression. Further, since the image layer is composed of a scanned image whose gradation changes pseudo-continuously, even if irreversible compression is performed, image quality degradation does not become apparent and a high compression rate can be realized.

FIG. 5 is a diagram for explaining the layer structure of the multi-mask method.
As illustrated in FIG. 5, the image data 700 having a two-layer structure includes a plurality of mask layers 710 a to 710 d and one image layer 720.
The mask layer 710 is a layer to which image elements with little gradation change (for example, 16 gradations or less) such as a character image or a simple CG (Computer Graphics) image are assigned. In this example, binary image elements are assigned. Yes. Accordingly, the image elements included in each mask layer 710 are composed of a single color and are expressed in two gradations.
The image layer 720 is a layer to which an image element having a larger number of gradations than the mask layer 710 such as a photographic image is assigned. In this example, a multi-value (16 gradations or more) image element is assigned. For example, the image layer 720 includes a complex CG image or a continuous tone image. Here, the continuous tone image is an image in which a sufficiently continuous gradation is expressed in view of human visual characteristics, for example, an image expressed in 16 gradations or more per color.
The display image 750 is displayed or printed by overlaying mask layers 710a to 710d on the image layer 720 in a preset order.

  As described above, when the code data encoded by the multi-mask method is acquired by the data acquisition unit (FIG. 4), the partial data selection unit 510 is instructed to perform automatic page feed. The code data of the part layer is selected. The partial data selection unit 510 desirably selects a layer that recalls the content of the display image, such as a layer (black mask layer) to which a character image is assigned.

FIG. 6 is a diagram for explaining the layer structure of the MRC method.
The MRC image data is composed of a plurality of image layers to which image elements constituting an image are allocated, and a selection layer for selecting image elements to be output for each image area. In this example, as shown in FIG. 6, the image data 800 having a three-layer structure has a foreground layer 810 and an image layer 820 as image layers, and a selection layer 830 for selecting an image element from these layers. Also have.
The foreground layer 810 is assigned a low gradation image such as a simple CG image or a character image. The foreground layer 810 has a plurality of color information and halftone information included in the CG image or character image.
The image layer 820 is assigned a continuous tone image having a larger number of tones than the foreground layer 810.
The selection layer 820 includes binary data indicating which image element of the foreground layer 810 and the image layer 820 is output for each image area (for example, for each pixel), and a pattern image is formed using the binary data. The In this example, the black portion of the selection layer 820 is a pattern image for selecting an image element of the foreground layer 810, and the white portion is a pattern image for selecting an image element of the image layer 820.
The display image 850 is obtained by displaying or printing an image element selected from the image elements included in the foreground layer 810 and the image layer 820 according to the binary pattern included in the selection layer 820.

Similarly in this case, when the code data encoded by the MRC method is acquired by the data acquisition unit (FIG. 4), the partial data selection unit 510 is instructed to perform automatic page feed. The code data of the part layer is selected. For example, the partial data selection unit 510 may select only one of the layers, or may select two layers including at least the selection layer 830.
Thereby, even if the image image and the character image overlap each other, the image display device 2 can extract only one of the image image and the character image and display it as a summary image. it can.

[Overall operation]
Next, the overall operation of the image display device 2 will be described.
FIG. 7 is a flowchart showing the operation (S10) of the browsing program 5. For convenience of explanation, a case where image data encoded by the MRC method is input will be described as a specific example.
As shown in FIG. 7, when a viewer selects an electronic document to be browsed using the UI device 26 (FIG. 3) in step 100 (S100), the data acquisition unit 500 (FIG. 4) is selected. Code data of the electronic document is acquired from the recording device 24 (FIG. 3) or the like.
In step 105 (S105), the UI control unit 540 determines whether or not an automatic page feed start operation has been performed. When the automatic page feed start operation has been performed, the UI page control unit 540 causes the partial data selection unit 510 to perform automatic page feed. Instructs to start feeding.
The browsing program 5 proceeds to the processing of S110 when the automatic page feed start operation (click operation of the forward page feed start button 264 or the reverse page feed start button 266 illustrated in FIG. 1) is performed. In other cases, wait until the start operation is performed.

In step 110 (S110), the partial data selection unit 510 selects the code data of the selection layer 830 from the code data acquired by the data acquisition unit 500 (data encoded by the MRC method), and is selected. The encoded data is output to the decoding unit 520.
In step 115 (S115), the decoding unit 520 decodes the code data (code data of the selection layer 830) input from the partial data selection unit 510, and continues the decoded data (partial data) of the selection layer. Output to the display unit 530.

In step 120 (S120), the continuous display unit 530 continuously displays the images assigned to the selection layer of each page based on the data of the selection layer input from the decoding unit 520 (FIG. 3). To display.
In step 125 (S125), when automatic page feed is started, the UI control unit 540 accepts a start operation (an operation for starting forward page feed 264 or a backward page feed start button 266 illustrated in FIG. 1). Are switched to an operation area (page feed stop button 272 illustrated in FIG. 1) that receives an automatic page feed stop operation.

In step 130 (S130), the viewer searches for the desired page while confirming that the summary image of the desired page is displayed while looking at the summary image of each page continuously displayed by automatic page feed. Then, the automatic page feed stop operation (click operation of the page feed stop button 272) is performed.
The UI control unit 540 determines whether or not an operation for stopping automatic page feeding is performed, and instructs the page determination unit 550 to determine a page to be displayed when an operation for stopping automatic page feeding is performed. .
The browsing program 5 proceeds to the processing of S130 when an automatic page feed stop operation (click operation of the page feed stop button 272) is performed, and in other cases, the automatic page feed is performed until the stop operation is performed. continue.

  In step 135 (S135), when an automatic page feed stop operation is performed, the UI control unit 540 sets an operation region (page feed stop button 272 illustrated in FIG. 1) for accepting the stop operation as an automatic page feed start operation. Is switched to an operation area (forward page feed start button 264 or reverse page feed start button 266 illustrated in FIG. 1).

  In step 140 (S140), the page determination unit 550 determines and determines the page to be displayed based on the timing when the automatic page feed stop operation is detected and the automatic correction amount determined in advance. The page is notified to the partial data selection unit 510.

In step 145 (S145), the partial data selection unit 510 selects code data of other layers (foreground layer 810 and image layer 820) of the determined page, and decodes code data of the selected other layers. Output to the unit 520.
The decoding unit 520 decodes the code data of the selected other layer, and displays the decoded data of the other layers (the foreground layer 810 and the image layer 820) on the content display unit 570 together with the data of the selected layer 830. Output.

  In step 150 (S150), the content display unit 570 determines the page determined by the page determination unit 550 based on the data input from the decoding unit 520 (data of the foreground layer 810, the image layer 820, and the selection layer 830). The image of is displayed.

In step 155 (S155), when the displayed page is not a desired page, the viewer manually changes the page (clicking on the forward page turning button 268 or the backward page turning button 270). .
The UI control unit 540 determines whether or not an operation for manually changing the page is performed, and when the operation for changing the page is performed, the code data of the page designated by the viewer with respect to the partial data selection unit 510 is obtained. The selection is instructed, and the image of the page designated by the viewer is displayed on the content display unit 570.
The browsing program 5 returns to the processing of S145 when an operation for manually changing the page (clicking operation of the forward page turning button 268 or the backward page turning button 270) is performed, and an operation for manually changing the page is performed. If not, the process proceeds to S160.

In step 160 (S160), when the displayed page is a desired page, the viewer performs an operation of confirming the page (clicking operation of the confirm button 274 (FIG. 1)).
The UI control unit 540 determines whether or not an operation for confirming the page (confirmation operation) has been performed, and when the confirmation operation is performed, a period from when automatic page feed is stopped to when the confirmation operation is performed Then, the number of pages manually changed (that is, the manual correction amount) is calculated, and the calculated manual correction amount is output to the page determination unit 550.
The browsing program 5 proceeds to the process of S165 when a confirmation operation (click operation of the confirmation button 274) is performed, and returns to the process of S155 when the confirmation operation is not performed.

  In step 165 (S165), the page determination unit 550 outputs the manual correction amount input from the UI control unit 540 and the most recent automatic correction amount to the history DB 560, and the page correction history (FIG. 2). Update.

As described above, the image display device 2 according to the present embodiment realizes the operation area for starting automatic page feeding and the operation area for stopping automatic page feeding at substantially the same position. Thereby, the time lag until the automatic page feed is stopped is minimized, and the automatic page feed is stopped in the vicinity of the desired page, so that the page search is facilitated.
Further, the image display device 2 automatically corrects the page to be displayed when the automatic page feed is stopped. Thereby, it is possible to easily display a page found when automatic page feed is performed. In particular, when the automatic correction amount is determined based on the page correction history, it is preferable because the displayed page is corrected in consideration of individual differences in the corresponding time.

[Modification]
Next, a modification of the above embodiment will be described.
The image display device 2 may perform page feeding at a constant speed when automatic page feeding is performed, but may gradually increase the page feeding speed after the automatic page feeding is started. Specifically, the continuous display unit 530 gradually increases the switching speed (that is, the page turning speed) of the summary image corresponding to each page of the electronic document after the automatic page turning is started. In other words, the continuous display unit 530 performs page feeding slowly immediately after the automatic page feeding is started. Thereby, the viewer can change the page in units of one page by an operation of starting and stopping automatic page feed. In particular, as described above, when the areas where the automatic page feed start operation and the stop operation are accepted are substantially the same, the page search can be performed by simply clicking only this operation area, page by page. There is no need to provide an operation area (forward page turning button 268 and reverse page turning button 270).

  In the above-described embodiment, the image display apparatus 2 determines the manual correction amount based on the page confirmation operation (click operation of the confirmation button 274 shown in FIG. 1). However, the present invention is not limited to this. For example, the amount of page change within a predetermined period from when automatic page turning is stopped may be used as a manual correction amount, or from when automatic page turning is stopped until the next automatic page turning is started. The amount of page change during this period may be the manual correction amount.

Moreover, in the said embodiment, although the image display apparatus 2 decodes only the code data of some layers among the image data comprised by the layer structure, and produces the summary image, it is limited to this. For example, only a part of color components included in the image data of the electronic document may be decoded to create a summary image.
Further, the image display device 2 may calculate a code amount for each region included in each page, and create a summary image using a density value corresponding to the calculated code amount.

FIG. 8 is a diagram illustrating a method of creating a summary image 902 based on the code amount. FIG. 8A illustrates an image area on each page, and FIG. 8B illustrates each image area. The summary image 902 created based on the code amount of is illustrated.
As illustrated in FIG. 8A, the image display device 2 divides each page into a plurality of image areas, and calculates a code amount for each of the divided image areas. The image display device 2 determines the density value for each image area in accordance with the calculated code amount, and fills each image area with the determined density value, whereby the summary image 902 illustrated in FIG. 8B is illustrated. Create
For example, the image display device 2 assigns a higher density value as the code amount of the image area is larger, thereby displaying the image area where the image is crowded and dusted with a higher density value, and the impression of each page can be viewed by the viewer. Recall.
In this case, the image display device 2 can display the summary image at high speed because it is not necessary to decode the code data during automatic page feed.

It is a figure which illustrates the display screen on which an electronic document is displayed. It is a figure which illustrates page correction history. It is a figure which illustrates the hardware constitutions of the image display apparatus 2 concerning this invention. It is a figure which illustrates the structure of the browsing program 5 which is performed by the control apparatus 20 (FIG. 2) and implement | achieves the image display method concerning this invention. It is a figure explaining the layer structure of a multi-mask system. It is a figure explaining the layer structure of a MRC system. It is a flowchart which shows operation | movement (S10) of the browsing program 5. FIG. It is a figure explaining the method of producing the summary image 902 based on code amount, (A) illustrates the area | region of the image in each page, (B) is produced based on the code amount of each image area. The summarized image 902 is illustrated.

Explanation of symbols

2 ... Image display device 26 ... User interface device 260 ... Display screen 264 ... Forward page feed start button 266 ... Reverse page feed start button 272 ... Page feed stop button 5. ··· Browsing program 500 ··· Data acquisition unit 510 ··· Partial data selection unit 520 · · · Decoding unit 530 · · · Continuous display unit · 540 · UI control unit · 550 · · Page determination unit 560 ···・ History database 570 ... Content display section

Claims (3)

An image display device for displaying an image file composed of a plurality of pages,
Continuous display means for continuously displaying page images corresponding to each page of the image file while performing page turning;
Stop operation accepting means for accepting a stop operation for stopping the page feed and displaying a desired page;
When a stop operation is received by the stop operation receiving means, the continuous display is performed according to an instruction from the outside, with a page corresponding to the page image displayed at the timing when the stop operation is received as a reference page. Storage means for storing the number of pages returned in the direction opposite to the direction displayed by the means;
Page determination means for determining, as a page to be displayed, a page that is returned from the reference page by the number of pages obtained by applying a Kalman filter to the number of pages stored in the storage means;
An image display device comprising: a page display unit that displays a page determined by the page determination unit. An image display method for displaying an image file consisting of a plurality of pages,
While performing page feed, the page image corresponding to each page of the image file is displayed continuously,
Accept stop operation to stop page feed and display desired page,
When the stop operation is accepted, the page corresponding to the page image displayed at the timing when the stop operation is accepted is set as a reference page, and the direction is continuously reversed according to an instruction from the outside. Remembers the number of pages returned to
A page returned from the reference page by the number of pages obtained by applying a Kalman filter to the stored number of pages is determined as a page to be displayed.
An image display method for displaying a page determined as a page to be displayed. In an image display device that displays an image file consisting of a plurality of pages,
Continuously displaying page images corresponding to each page of the image file while performing page feed;
Accepting a stop operation to stop page feed and display a desired page;
When the stop operation is accepted, the page corresponding to the page image displayed at the timing when the stop operation is accepted is set as a reference page, and the direction is continuously reversed according to an instruction from the outside. Storing the number of pages returned in the direction of
Determining, from the reference page, a page that is returned by the number of pages obtained by applying a Kalman filter to the stored number of pages as a page to be displayed;
A program for causing the image display device to execute a step of displaying a page determined as a page to be displayed.

Images