JP3580685B2 - Electronic book display control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic book device that can browse an electronic document as if it were a book. In particular, the present invention relates to an electronic book display control device that reproduces data obtained by digitizing a document as image data and media and displays the data on a display.
[0002]
[Prior art]
Conventional techniques for switching display control as if turning a book are disclosed in Japanese Patent Application Laid-Open Nos. 64-86191 and 2-181864. The former uses a memory that stores two types of images and a control unit that includes two selectors and a speed controller to project the next screen in a part of the display area of the previous screen, and gradually increases the display area of this next screen. Finally, by displaying the image of the next screen, the display can be switched as if turning a page. The latter is provided with a book outline display unit that displays the outline of the book, displays a portion of the thickness of the book (edge), displays a page at a pointed position when the edge is designated, and changes the thickness of the edge. Thus, a user-friendly electronic book device that resembles page turning of a book is realized.
[0003]
Further, as in the example of Japanese Patent Application Laid-Open No. 5-53726, an input detecting means is provided on a display screen as a display device of an information processing device, and a display for detecting a locus of a pen movement, a direction and a speed of the movement, etc. Integrated tablet devices are known.
[0004]
[Problems to be solved by the invention]
However, in the first method, since the display portion is obtained by calculation, the display control is only the operation as calculated by the speed controller, and there are few variations, and the display control is switched according to the stored image data. There is a problem that lacks flexibility. For example, a display that resembles the page switching of the center opening cannot be performed, and there is a limit in devising the page switching display to make the configuration more user-friendly.
[0005]
Further, in the above method, since the page is switched at the display speed calculated by the controller, it is difficult to change the display speed based on the content of the data to be displayed or to skip the display page.
[0006]
Further, in the second method, there is a problem that it is necessary to separately prepare an image memory having a capacity twice as large as the display area in addition to the display memory.
[0007]
The present invention solves the above-mentioned problem of the conventional example by using a column information storage table for storing column information of page switching data and an address of a display preparation image data storage unit and a current display page and a next display page from a column information. An object of the present invention is to provide a function of controlling a display speed flexibly by image data and switching pages as if turning a book by providing a display switching control unit including a selection unit for selecting image data.
[0008]
Further, in order to solve the problem of the above-described conventional example, the present invention includes a data latch for reading and storing image data in a display image data storage unit, thereby reducing the capacity of the image memory to approximately half that of the related art. The purpose is to:
[0009]
Still another object of the present invention is to provide a high-speed ROM for storing column information of a display image, thereby enabling high-speed page switching.
[0015]
[Means for Solving the Problems]
The electronic book display control device according to claim 1, wherein the electronic book display control device displays the contents of the digitized book on the display unit in such a manner as to display the contents of the digitized book in a plurality of stages from the start to the end of one page turning. In the book display control device, an image data storage unit that stores digitized book contents as image data in units of pages, a display buffer that stores image data displayed on a display screen, and an image data storage unit. A second buffer for storing the image data of the page to be displayed next, and for each of the stages, the image data to be displayed at the display position corresponding to each display position on the display screen. A section indicating which one of the buffers to select from, and a position indicating the position of the image data to be displayed in the buffer indicated by the section are stored in advance. A page switching data storage unit, and image data at each display position of the display buffer at the stage indicating the progress of page turning, by referring to the page switching data storage unit and dividing the image data at the stage and the display position. A display switching control unit that replaces the image data corresponding to the second buffer only when the image data is the second buffer.The image data stored in the image data storage unit is divided so that it can be read out in the order necessary for page switching.It is characterized by the following. This reduces the capacity of the display preparation image memory (buffer).Along with this, it is possible to pre-read display data, enabling display of image data with a story with less memory capacity.Act like so.
[0017]
Claim2The electronic book display control device according to the above, has two memories as the second buffer, when reading the image data for display from one of the second buffer, from the image data storage unit to the second buffer The input / output portion of the second buffer is provided with an input selector and an output selector for selecting a memory so as to transfer data to the other memory. As a result, the display time of the image is shortened.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 1,Electronic book display control deviceExample (Example 1)FIG. Reference numeral 1 denotes a CPU that controls the entire apparatus, 2 denotes an image data storage unit that stores the contents of a book as image data, 3 denotes an image data control unit that captures the image data and performs desired control, and 4 Is a display preparation image data storage unit for storing image data of the current display page and the next display page, 5 is a display unit for displaying image data of book contents and information relating to the operation of the electronic book, and 6 is the above display A display control unit for controlling the display unit; 7, a display image data storage unit for storing data to be displayed on the display unit; 8, an input unit for a user to operate the electronic book; A page switching data storage unit that stores data displayed on the display unit at a specific time during the switching period, and 10 is a column information storage that stores column information of the page switching data. A Buru, 11 denotes a display switching control unit comprising a selection means for selecting the image data of the address and the current display page and the next display page of the display ready for the image data storage unit from the column information. Note that the next display page in the present invention may be the next page in the book, the previous page, or a page that is a few pages away from the current display page.
[0020]
FIG. 2 is a diagram illustrating an example of the page switching data described in the page switching data storage unit. First, T0 to Tq on the vertical axis in the figure will be described. Here, q represents the number of page switching scenes to be displayed. T0 to Tq represent times when each scene is displayed during the page switching period, and each time will be described using a four-page spread book as an example. Initially, page 1 or 2 is opened, and page switching is considered such that page 2 is turned and pages 3 and 4 are opened.
[0021]
Time T0 is the time at which the page switching is started, in which page 1 and page 2 are open. T2 is a time when the turning of the second page is being started. Half of the spread is the first page, and the other half is the time when the second and fourth pages are opened at a certain ratio. TpIndicates the time at which one more page is displayed, and the other half is the time at which four pages are displayed. Further, the page turning is continued, and the time at which half of the page spread is displayed at a certain ratio of four pages, the other one page and three pages is Tp + 2. Tq is the time when page turning is completed and pages 3 and 4 are displayed.
[0022]
The horizontal axis of FIG. 2 represents the column numbers 0 to N of the display image data storage unit at the time during the page switching period, and the cell where the vertical axis and the horizontal axis intersect indicates the current display page or the next display. A page and a value represented by A and B, respectively, and a column number of the display preparation image data storage unit corresponding to the column number of the display image data storage unit are described. For example, figure2, The value in the third column at time T2 is (B, 3). This means that the data in the third column of the display image data storage unit is read from the third column of the display preparation image data memory storing the next display page.
[0023]
FIG. 3 is a block diagram illustrating the periphery of the display switching control unit in FIG. 1 in more detail. Reference numerals 14 and 15 denote two types of memories in the display preparation image data storage unit. In the present invention, these are distinguished as a memory and b memory. In the figure, the same numbers as those in FIG. 1 are the same as those defined in FIG. Reference numeral 21 denotes a counter that manages a page switching scene. The number of counters starting from 0 and at time Tq is q. An address generation unit 22 repeatedly generates addresses of the display image data storage unit, and sequentially generates addresses from the upper left end to the lower right end of the display image data storage unit.
[0024]
Reference numeral 23 denotes a memory selection unit that refers to the column information storage table and selects a memory of the display preparation image data storage unit. That is, either the memory a or the memory b is selected.
[0025]
Hereinafter, the control method of the display switching control unit will be described in detail based on the flow of FIG.
First, when there is a request for displaying the next display page from the input device, the request signal is passed to the CPU, and the CPU transmits the request signal to the image data control unit. The image data control unit stores the image data of the next display page stored in the image data storage unit based on the request signal in the a memory or the b memory of the display preparation image data storage unit, and does not store the current display page. Is read into the other memory (step S1). This means that if the current display page is stored in the memory a, the data of the next display page is stored in the memory b.
[0026]
Since the time at which the image data is read is the page switching start time T0, the display switching control unit sets the counter value to 0 (step S2). Further, since the time is T0, the address generation unit sets the address (0, 0) at the uppermost left end as the address of the display image data and initializes the address (step S3).
[0027]
Next, the display switching control unit sends the value 0 of the counter and the value 0 of the x coordinate of the address generation unit to the column information storage table (step S4). Next, the display switching control unit obtains the corresponding memory of the display preparation image data storage unit and the x coordinate from the column information storage table (step S5). That is, since the column is 0 and the time is T0, it is derived that the memory of the image data for display preparation is A and its x coordinate is 0.
[0028]
The memory select unit selects the memory of the display preparation image data storage unit from the above values, and the display switching control unit transfers the display preparation image data specified above to the display image data storage unit (step S6). . Step S7 is a routine for determining whether or not display of the display image data has been completed. If the address generated by the address generation unit scans all the addresses of the display image data storage unit, the process proceeds to step S9. Goes to step S8. Here, the completion of the address scanning means that when the display image data of each page switching is displayed on the display unit, all the addresses are scanned from the upper left corner to the lower right corner of the image. The direction is advanced from the upper left end to the lower right end of the screen as in a normal display device scanning method.
[0029]
If the scanning of the address of the display image data storage unit is not completed, the address generation unit advances the address (step S8).
[0030]
On the other hand, if the address has completed the scanning of the display image data, that is, if the counter value c satisfies c ≧ q, the page switching display process is terminated, and a next page switching request is waited for (step S9).
[0031]
If c is smaller than q, a constant K is added to the counter (step S10). Where K issceneSpecifies the amount of skipping. In the case of 1, it is all without thinning.sceneAnd 1 for 2sceneThis is to display every other. This value of K may be fixed in advance by the display switching control unit, or may be changed based on information observed from the input unit in FIG. Here, the information observed from the input unit includes, for example, the speed and strength of a stroke with respect to the input unit, a gesture, and the like. Observed information makes it possible to control the speed and degree of page switching.
[0032]
In step S10, if the time required to switch the page when the value of K is set to 1 is Tf, if the value of K is set to 3, the time to switch the page is Tf / 3. When turning in the opposite direction, the value of K is set to, for example, −1, and further, q is set to the initial value of the counter in step S2 in FIG. 4, the condition of step S9 is set to q ≦ 0, and the memory selected by the memory selection unit is selected. , The page can be turned in the opposite direction.
[0033]
Next, the page switching dataMemoryThe data stored in the section will be described. FIG. 11 shows the state of page switching at times T0, T2, Tp, Tp + 2, and Tq in the display image data storage unit. Note that A is a display preparation image memory for the current display page, and B is a display preparation image memory for the next display page.
[0034]
According to FIG. 2 showing an example of the page switching data, at time T2, data 0, 1, 2 of B are sent to the 0, 1, 2, 3rd columns of the display image data in the display image data storage unit. , 3rd column is selected, and the 0th, 3rd, Mth, and Nth columns of A are selected as the data sent to the 4th, 5th, Mth, and Nth columns.
[0035]
On the other hand, at time Tp + 2, the data in the M + M / 4, M + M / 2, M + 3M / 4, and N columns of B are selected in the M + 1, M + 2, M + 3, and M + 4 columns of the display image data from FIG. Sent to the image data storage unit.
[0036]
As described above, by configuring the page switching data described in the page switching data storage unit as shown in FIG. 2, the change of the image displayed with the lapse of time is almost equal to the case of turning over an actual book. It becomes possible to control so that
[0037]
Also, page switching dataIsHowever, since it is not determined by using any arithmetic circuit, it is possible to flexibly realize the page switching display with less discomfort by changing the numerical value of the table.
[0038]
next,Related to child book display control deviceotherAn example(Example 2)Is shown.An example1, the page switching data storage unit has been described as having a different configuration from the image data storage unit.An exampleReference numeral 2 denotes a page switching data storage unit shared with an image data storage unit. The page switching data is stored in the image data storage unit together with the image data. In this case, the image data control unit loads the page data switching data into the display preparation image data storage unit together with the image data in the image data storage unit. The display switching control unit includes:An exampleInstead of taking in the data from the page switching data storage section described in 1, the page switching data is taken in from the display preparation image data storage section. Other processing,An exampleThis is the same as that described in 1.
[0039]
next,Example 3 is an exampleThis is a case where a ROM or a rewritable ROM such as a flash ROM or an EEPROM is applied to the page switching data storage unit 1.An example1 can be performed in the same manner. As an embodiment using a rewritable ROM, for example, when the page switching data of FIG. 2 is applied, if the sense is different from the actual page switching of turning over, the page may be swollen by rewriting the page switching data. More natural page switching such as page switching and page switching according to the visual characteristics of the eyes can be realized.
[0040]
Next, an example4 is a case where the column information storage table and the image data are paired,An exampleThe processing in step S1 written in No. 1 can be realized by changing as follows. That is, the image data control unit calls the page switching data together with the next display page data, and the display switching control unit transfers the page switching data to the column information storage table.
[0041]
FIG.,Electronic book display control deviceotherProcessing(Example 5)FIG. Reference numeral 61 denotes an outer shell of the apparatus, and a white portion is a display unit. In this example, a description is given assuming that a display-integrated pen tablet is used for the input unit and the display unit. The moving speed of the pen can be detected by a display-integrated pen tablet. In FIG. 12, the moving speed and the direction are represented by arrows and line lengths. For example, 62 indicates a case where the pen is slowly moved rightward, 63 indicates a case where the pen is slowly moved leftward, and 64 indicates a case where the pen is quickly moved rightward. For example, the sign when the pen moves to the right is made positive, the case when the pen moves in the reverse direction is made negative, and the maximum moving speed vmax of the pen detected by the input unit is set as the minimum moving speed, and the minimum moving speed is set as vmin. By setting K = q at vmax and K = 1 at vmin and setting the value of K to be an integer, it is possible to switch pages according to the movement of the pen. That is, by using the display-integrated tablet for the input unit and the display unit, it is possible to control page switching based on information from the input unit.
[0042]
In the display-integrated pen tablet device, the pointing device may be a pen or a finger.
[0043]
Recognize the gesture using the function of digitizing coordinates by the pointing device, for example, go to the backward page with the character of “no”, and move forward with the reverse stroke of “no”. With the size of "," the amount of pages to be skipped can be specified, and the speed of turning a page can be specified in proportion to the writing speed of "no."
[0044]
Figure 6,Electronic book display control deviceRubuIt is a lock figure. Reference numeral 1 denotes a CPU that controls the entire apparatus, 2 denotes an image data storage unit that stores the contents of a book as image data, 3 denotes an image data control unit that captures the image data and performs desired control, and 4 Reference numeral 5 denotes a display preparation image data storage unit for storing image data of the current display page and the next display page, 5 a display unit for displaying image data of book contents and information on operation of the electronic book, and 6 a display unit. Reference numeral 5 denotes a display control unit for controlling the display unit, 7 denotes a display image data storage unit for storing data to be displayed on the display unit, 8 denotes an input unit for a user to operate an electronic book, and 9 denotes a page. A page switching data storage unit for storing data displayed on the display unit at a specific time during the switching period, and 10 is a column information storage table for storing column information of the page switching data. Reference numeral 11 denotes a display switching control unit that includes an address of the display preparation image data storage unit and selection means for selecting the image data of the current display page and the next display page from the column information. This is a data latch for storing a unit.
[0045]
FIG., tableFIG. 2 is a detailed configuration diagram of an indication switching control unit and its periphery. The memory select section selects one of the a memory and the display image data storage section. The memory select section is disposed between the a memory and the display image data storage section, and the display image data storage section and the data latch. A two-way data exchange takes place between.
[0046]
Here, the data latch is a memory having a function of temporarily capturing data of one pixel. Data of one pixel is taken into the data latch from the display preparation image data storage unit and the display image data storage unit, and is transferred to the display image data storage unit. Compared with the case of FIG. 3, the configuration other than the data latch is the same, but the image data storage unit for display preparation requires half the capacity.
[0047]
FIG. 8 is a diagram showing a flow of processing of the electronic book display control device having the configuration of FIG. Hereinafter, the processing surrounding the data latch according to the present invention will be described with reference to the processing flow of FIG.
[0048]
First, when there is a request for displaying the next display page from the input device, the request signal is passed to the CPU, and the CPU transmits the request signal to the image data control unit. The image data control unit stores the image data of the next display page stored in the image data storage unit based on the signal processing in a memo of the display preparation image data storage unit.ToRead (step S11).
[0049]
Since the time when the image data is read is T0, the display switching control unit sets 0 to the counter value (step S12). Also, since the time is T0, the address generation unit sets (0, 0) to the address of the display image and initializes it (step S13).
[0050]
Next, the display switching control unit sends the counter value 0 and the x-coordinate value 0 of the address generation unit to the column information storage table (step S14). Next, the display switching control unit obtains the corresponding memory of the display preparation image data storage unit or the display image data storage unit and the x coordinate from the column information storage table (step S15). That is, since the column is 0 and the time is T0, the display preparation image data storage unit is selected, and it is derived that the x coordinate is 0.
[0051]
The memory selection unit selects the memory of the display preparation image data storage unit from the above values, and the display switching control unit transfers the display preparation image data specified above to the data latch (step S16). Next, the display switching control unit sends the display image data from the data latch to the display image data storage unit (step S17).
[0052]
If the address scans all the addresses in the display image data storage unit, the process proceeds to step S20, and otherwise proceeds to step S19 (step S18).
[0053]
If the address does not complete the address scanning of the display image data storage unit, the address is advanced (step S19). On the other hand, if the address has completed the scanning of the display image data and the value c of the counter satisfies c ≧ q, the process ends (step S20). If c <q, 1 is added to the counter value (step S21).
[0054]
FIG.Is a table that stores the difference between the data of the currently displayed page and the data of the previous displayed page in the table that stores the column information of the page switching data.JointExampleIs.
[0055]
FIG. 9 is a diagram showing page switching data using V in place of B and B in place of A in FIG. Here, V indicates that the display image data storage unit is used, and A indicates that the display preparation image data storage unit is used. The value of column 4 at time T2 is V, 2. From this figure, it is shown that what existed in column 0 at time T0 has moved to column 2 at time T1, and has moved to column 4 at time T2. That is, the page switching data in FIG. 9 is configured by data of a difference from the immediately preceding display page. This makes it possible to realize page turning like a book with a small capacity without requiring a special arithmetic circuit.
[0056]
FIG.,Electronic book display control deviceother1 is a CPU that controls the entire apparatus, 2 is an image data storage unit that stores the contents of a book as image data, and 3 is image data that captures the image data and performs desired control. A control unit, 4 is a display preparation image data storage unit for storing image data of the current display page and the next display page, and 5 is a display unit for displaying image data of book contents and information on operation of the electronic book. 6, a display control unit for controlling the display unit 5, a display image data storage unit 7 for storing data to be displayed on the display unit, and an input unit 8 for the user to operate the electronic book. Reference numeral 9 denotes a page switching data storage unit that stores data displayed on the display unit at a specific time during the page switching period. Reference numeral 10 denotes column information of the page switching data. Reference numeral 11 denotes a display switching control unit including a selection unit for selecting an address of a display preparation image data storage unit and image data of a current display page and a next display page from the column information. Is a data latch for storing a part of the image data, and 13 is a selector for controlling so as to refer to a desired memory in reading and writing of the display preparation image data.
[0057]
The selector is configured such that the b memory is a data latch while the a memory of the display preparation image data storage unit is transferring data to the image data storage unit, and the b memory is a data latch while the a memory is transferring data to the data latch. It operates to transfer data with the image data storage unit.
[0058]
next, PaintingIt is assumed that the image data stored in the image data storage unit is divided into eight from A to H and stored as shown in FIG. However, the image data in A to H are arranged in the order of the smallest column number, A, D, E, H have even-numbered column data, and B, C, F, G have odd-numbered column data. Arrange the column data.
[0059]
When the page is turned from left to right, the next display page calls A and B first until Tq / 4, which is the switching state of the page switching in which the page is opened by 45 degrees, and Tq / 4 and thereafter. The image is displayed by thinning out the columns. If the even-numbered column is called first by thinning out, if it is called in the order of A, B, C, D, E, H, F, and G, it will be called in the order of data shown in FIG.
[0060]
If the display preparation image data storage unit is divided into two and the selector 1 is controlled to read out the eight divided images two by two, first, as shown in FIG. The memory a can be accessed from the data latch while the memory C is loaded into the memory a and the memory D is loaded into the memory b. The memory b can be accessed from the data latch while the memory E and H are loaded into the memory a Thus, reading from the image data storage unit storage and calling to the data latch are performed in parallel. In this configuration, the required capacity of the a-memory and the b-memory can be realized by half the size of the image.
[0061]
【The invention's effect】
DepartureClearlyAccording to this, since the display page is switched by controlling the column information and the display data, it is possible to flexibly control the images of the current display page and the next display page, and realize a page turning function such as turning a book. be able to. By simply changing the numerical value of the page switching table, a page switching display with less discomfort can be realized without using any arithmetic circuit.
[0066]
AlsoBy providing the data latch for reading and storing the image data in the display image data storage section, the capacity of the display preparation image memory can be reduced to about half.
[0067]
AlsoBy storing the information of the difference between the data of the currently displayed page and the data of the page opened immediately before in the table storing the column information, the capacity of the display image memory can be further reduced. Will be possible.
[0068]
AlsoBy providing an input selector and an output selector for selecting a memory in the input / output part of the display preparation image data storage unit, it is possible to shorten the image display time.
[0069]
AlsoThe image data stored in the image data storage unit is divided and decimated so that the image data can be read out in the order required for page turning, thereby realizing natural page turning with a smaller capacity. Become.
[Brief description of the drawings]
FIG.ElectricChild book display control device(Example 1)FIG.
FIG. 2Example 1FIG. 7 is a diagram showing page switching data in FIG.
FIG. 3 is a detailed diagram of a display switching control unit.
FIG. 4 is a flowchart of a processing procedure of the electronic book display control device.
FIG. 5 is a diagram showing a method of calling image data into a display preparation memory.
FIG. 6 is an electronic book display control device.FruitFIG. 1 is a block diagram showing the overall configuration of an embodiment.
FIG. 7RealFIG. 4 is a detailed diagram of a display switching unit in the embodiment.
FIG. 8RealThe figure of the flow of the processing procedure in an Example.
FIG. 9RealFIG. 9 is a diagram of page switching data in the embodiment.
FIG. 10 shows an electronic book display control device.otherFIG. 2 is an overall configuration block diagram of an embodiment of FIG.
FIG. 11 is a diagram illustrating a state of page switching during a page switching period.
FIG. 12 is a diagram schematically illustrating page switching request information by an input unit.
[Description of sign]
DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... Image data storage part, 3 ... Image data control part, 4 ... Display preparation image data storage part, 5 ... Display part, 6 ... Display control part, 7 ... Display image data storage part, 8 ... Input unit 9, page switching data storage unit 10, column information storage table 11, display switching control unit 12, data latch, 13 selector, 14 a memory, 15 b memory, 21 counter, 22 Address generation unit, 23: memory selection unit.

Claims (2)

In an electronic book display control device that displays the start and end of a single page turning in a plurality of stages and displays the digitized book content on a display unit as if turning the book, the electronic book content is displayed on a page. An image data storage unit that stores the image data as a unit, a display buffer that stores the image data displayed on the display screen, and a second buffer that stores the image data of the next page to be displayed in the image data storage unit. 2 buffers and, for each of the stages, corresponding to each display position on the display screen, and a division indicating which image data to be displayed at the display position is selected from the display buffer or the second buffer. A page switching data storage unit for storing in advance a position indicating the position of the image data to be displayed in the buffer indicated by the section; The image data at each display position of the display buffer in the step indicating the progress of the data transfer is referred to the page switching data storage unit, and when the section corresponding to the step and the display position is the second buffer. only have a display switching control unit to replace the corresponding image data of the second buffer, the image data stored in the image data storage unit is divided so as to allow sequentially reads the page requires switching electronic book display control device characterized by placing. It has two memories as the second buffer, and when reading image data for display from one of the second buffers, data is transferred from the image data storage unit to the other memory of the second buffer. , the electronic book display control device according to claim 1, characterized in that it comprises an input selector and an output selector for selecting the memory to the input and output portions of the second buffer.

Images