JP2010044583A - Display device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for facilitating a user to quickly understand the outline of each page even when a reduction scale factor of a reduced image is changed. <P>SOLUTION: When the display instruction of a thumb nail image is input, a CPU 11 specifies a reduction scale factor with an initial value stored in a storage part 14, and makes a storage property display body 21 display the thumb nail image reduced by the shrinkage scaling factor. When the user brings an electronic pen 2 close to the display surface of the storage property display body 21, the CPU 11 measures a distance from the display surface of the storage property display body 21 to the electronic pen 2 by a pen detection part 19, and specifies the position of the electronic pen 2 on the display surface. Then, the CPU 11 calculates the reduction scale factor from the measured distance, and selects a page from the specified position, and performs layout processing corresponding to the reduction scale factor only to the prescribed number of leading characters, and performs partial layout processing to displace the residual characters with a graphic image for each page. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for visually displaying the number of pages of image data.

  When a document image composed of a plurality of pages is displayed, thumbnail images of the pages may be displayed side by side. A thumbnail image is a reduced image obtained by reducing the size of an image represented by image data. By displaying a plurality of thumbnail images side by side, the user can grasp the outline of the entire document. By reducing the reduction ratio of the thumbnail images on each page, it is possible to display more thumbnail images at the same time, so it is convenient to grasp the outline of the entire document, but the contents written on each page can be changed. It may be difficult to distinguish. On the other hand, if the thumbnail image reduction magnification is increased, the contents of individual pages are easily discriminated, but the number of thumbnail images that can be displayed at the same time decreases, and the listability deteriorates. Therefore, the user may select the reduction ratio of the thumbnail image as necessary.

By the way, various techniques for determining the content and size of an image displayed on a display device according to the distance between the display surface of the display device and an object such as an operator have been developed. For example, Patent Document 1 discloses a method for controlling enlargement / reduction of an operation screen in conjunction with a distance between a touch panel on which the operation screen is displayed and an operation pen (finger). Patent Document 2 discloses a technique for changing the content of an image to be displayed according to the distance between the user and the display surface. Furthermore, Patent Document 3 discloses a technique for enlarging / reducing a map image to be displayed based on a movement history of a finger touching the display surface.
JP 2006-85218 A JP 2003-140632 A JP 2007-310888 A

When the reduction ratio of the thumbnail image of the document is changed by the techniques described in Patent Documents 1 to 3 described above, the reduction ratio is changed for each character in the document, and each character after the change is displayed in the display area. The layout process of arranging is required. However, when the processing capacity of the display device is low with respect to the processing amount of the layout processing, it takes a certain amount of time, so that it is difficult for the user to quickly grasp the outline of each page.
The present invention has been made in view of such a background, and even when the reduction magnification of the reduced image is changed, the user can perform a display that makes it easy to quickly grasp the outline of each page. Objective.

In order to solve the above-described problems, a display device according to the present invention includes a display unit having a display surface, a distance measuring unit that measures a distance from a display surface of the display unit to an operator operated by a user, and the distance Magnification specifying means for specifying a reduction ratio when the image of each page included in the document data is reduced and displayed according to the distance measured by the measuring means, and the size of the reduction ratio specified by the magnification specifying means If the image changes, a part of the image of each page is reduced at the reduction ratio and displayed on the display means, and then the entire image of the page is reduced at the reduction ratio and the display is performed. And a reduced image display control means to be displayed on the means.
Thereby, even when the reduction magnification of the reduced image is changed, the user can obtain a display that allows the user to quickly grasp the outline of each page.

Preferably, the reduced image display control means reduces the size of the reduction magnification specified by the magnification specifying means after reducing a part of the image of each page at the reduction magnification and displaying the reduced image on the display means. If it has not changed for a certain time, the entire image of each page may be reduced by the reduction ratio and displayed on the display means.
Thus, the user can display the entire image of each page on the display device at the reduction magnification only by keeping the distance between the operation element and the display surface constant.

Preferably, the image processing apparatus includes an operation unit that receives a user's operation, and the reduced image display control unit reduces a part of the image of each page at the reduction ratio and displays the image on the display unit. When a predetermined operation is accepted by the operation means, the whole image of each page may be reduced by the reduction ratio and displayed on the display means.
As a result, when the display device displays only a part of the image of each page in a reduced size, the user reduces and displays the entire image of each page on the display device at an arbitrary timing with the reduction magnification. Can be made.

Preferably, when the reduced image display control means reduces a part of the image of each page at the reduction ratio and causes the display means to display the reduced image display control means, the reduced image display control means replaces the image other than the part with the reduced magnification. It is preferable to display a graphic image having a size corresponding to the above.
Thus, the display device can display an outline of the image only by performing a reduction process on only a part of the image of each page to be displayed. Further, by referring to the amount or number of graphic images in a page, the amount of characters on the page can be roughly grasped.

Preferably, the reduced image display control means reduces the part of the image of each page at the reduction ratio and displays the graphic image as an image other than the part while displaying the image on the display means. It is preferable to display the entire image of each page on the display means by replacing the image with the image reduced at the reduction magnification.
Thereby, it is possible to omit the reduction processing when displaying a part of the image of each page in a reduced size when the entire image is reduced and displayed.

In addition, the program according to the present invention provides a reduction ratio when the computer displays an image of each page included in the document data in a reduced manner according to the distance from the display surface of the display means to the operator operated by the user. When the magnification specifying means for specifying the image and the reduction magnification specified by the magnification specifying means change, a part of the image of each page is reduced at the reduction magnification and displayed on the display means. And a program for functioning as a reduced image display control means for reducing the entire image of each page at the reduction ratio and displaying the image on the display means.
Thereby, even when the reduction magnification of the reduced image is changed, the user can obtain a display that allows the user to quickly grasp the outline of each page.

[Constitution]
FIG. 1 is a diagram illustrating an appearance of a display device 1 according to the present embodiment. The display device 1 is, for example, electronic paper. FIG. 2 is a diagram illustrating a hardware configuration of the display device 1. A CPU (Central Processing Unit) 11 shown in FIG. 1 controls each unit of the display device 1 by executing a program stored in a ROM (Read Only Memory) 12 or a storage unit 14. The ROM 12 stores programs and data necessary for starting up the display device 1. A RAM (Random Access Memory) 13 is used as a work area when the CPU 11 executes a program. The storage unit 14 is a storage unit such as a hard disk or a flash memory, and stores programs executed by the CPU 11, document data, and the like. This document data is data representing a document displayed on the memory display 21 and is divided into a plurality of pages.

  The power supply 15 is a rechargeable battery, for example, and supplies power to each part of the display device 1. The power supply control unit 16 manages the power supply 15 and controls power supply by the power supply 15. The input / output unit 17 is an interface for exchanging data with the operation buttons 18 and the pen detection unit 19. As shown in FIG. 1, the operation button 18 is provided on the front surface of the display device 1, and inputs data corresponding to a user operation to the CPU 11 via the input / output unit 17. The operation button 18 is an example of an operation unit that receives a user operation. The pen detection unit 19 is provided on the back side of the memory display 21 and detects the electronic pen 2 within the detection range on the memory display 21 using an electromagnetic induction method. Then, the pen detection unit 19 specifies the position of the electronic pen 2 on the display surface of the memory display 21 and measures the distance from the display surface to the electronic pen 2. Here, it is assumed that the detection range of the pen detection unit 19 is a range of 10 cm from the display surface of the memory-type display body 21.

  A video random access memory (VRAM) 20 stores image data representing an image for one page displayed on the memory display 21. The memory display 21 is a display unit having a display surface constituted by a plurality of display elements such as an electrophoretic element, and is stored in the VRAM 20 when the display element is driven by the display control unit 22. An image corresponding to the image data is displayed. This memory-type display 21 has a display memory property, and power is required in the drive period from when the display element is driven until an image is displayed. After being displayed, the image can be continuously displayed even when power is not supplied. The display body control unit 22 is a drive circuit that drives the display element of the storage-type display body 21 based on the image data stored in the VRAM 20 and displays an image corresponding to the image data.

  Here, with reference to FIG. 3, the mechanism in which the pen detection part 19 detects the electronic pen 2 is demonstrated. The electronic pen 2 is an example of an instruction unit. The pen detector 19 has a plurality of sensor coils 19a arranged in a matrix. The sensor coils 19a-1, 19a-2, and 19a-3 in the drawing have a loop shape extending from the front side of the drawing to the back side of the drawing and are arranged in the X direction in the drawing. In the figure, only the sensor coils 19a arranged in the X direction in the figure are shown, but actually, on the sensor surface of the pen detection unit 19, there are a plurality of sensors in the Y direction orthogonal to the X direction. Sensor coils 19a are arranged. The pen detection unit 19 generates a magnetic field m on the display surface of the memory display 21 by causing a current to flow through the sensor coil 19a for a predetermined time. At this time, when the electronic pen 2 is brought close to the memory-type display body 21 and enters the magnetic field m, an induced current flows through the loop-shaped coil 25 provided inside the electronic pen 2, and charges are stored in the capacitor 26. It is done. As a result, a current flows through the coil 25 of the electronic pen 2 to generate a magnetic field at the tip of the pen, and an induced current flows through the sensor coil 19 a disposed below the electronic pen 2.

  The pen detection unit 19 can detect that the electronic pen 2 has entered the detection range by detecting the induced current flowing through the sensor coil 19a. Furthermore, the pen detection unit 19 can specify the position of the electronic pen 2 based on the position of the sensor coil 19a through which the induced current flows. In the example shown in the figure, the maximum induced current flows through the sensor coil 19a-2 disposed immediately below the electronic pen 2, and therefore the position Pt of the electronic pen 2 is specified based on the position of the sensor coil 19a-2. The Further, the pen detection unit 19 can calculate the distance L from the display surface of the memory display 21 to the pen tip of the electronic pen 2 based on the magnitude of the induced current flowing through the sensor coil 19a. The relationship between the magnitude of the induced current and the distance L can be determined by experiment or calculation.

  Next, characteristic functions of the display device 1 will be described with reference to FIG. FIG. 4 is a diagram illustrating a functional configuration of the display device 1. As shown in the figure, the pen detection unit 19 includes a distance measurement unit 101 and a position specifying unit 102 as functional configurations. The distance measuring unit 101 measures the distance from the display surface of the memory display 21 to the pen tip of the electronic pen 2. The distance measuring unit 101 is an example of a distance measuring unit. The position specifying unit 102 specifies the position of the electronic pen 2 on the display surface of the memory-type display body 21. The position specifying unit 102 is an example of a position specifying unit.

  The CPU 11 includes a magnification specifying unit 103, a thumbnail image display control unit 104, and a magnification fixing instruction detection unit 105 as functional configurations. These functions are realized by the CPU 11 executing a program. The magnification specifying unit 103 is an example of a magnification specifying unit that specifies the reduction magnification of the thumbnail image displayed on the memory display 21. More specifically, the magnification specifying unit 103 stores the magnification stored in the storage unit 14 until the distance measurement unit 101 measures the distance from the display surface of the storage-type display body 21 to the pen tip of the electronic pen 2. Is read out, and the initial value is specified as the thumbnail image reduction magnification. Then, when the distance is measured by the distance measuring unit 101, the magnification specifying unit 103 calculates the magnification so that the size of the reduced page becomes smaller as the distance measured by the distance measuring unit 101 increases. The calculated magnification is specified as the thumbnail image reduction magnification. When the reduction magnification specified by the magnification specifying unit 103 changes, the thumbnail image display control unit 104 reduces a part of the image of each page with the reduction magnification and displays it on the memory display 21. This is an example of a reduced image display control means for reducing the entire image of each page at the reduction magnification and displaying it on the memory display 21 after the image is displayed. More specifically, in the thumbnail image display control unit 104, the position specifying unit 102 specifies the position of the electronic pen 2 on the display surface of the memory display 21, and the magnification specifying unit 103 specifies the reduction magnification of the thumbnail image. Then, some of the pages of the document data stored in the storage unit 14 are selected based on the specified position, and image data representing thumbnail images obtained by reducing each selected page with the specified reduction ratio is obtained. Write to the VRAM 20. This thumbnail image is an example of a reduced image.

  The magnification fixing instruction detection unit 105 detects an instruction to fix the reduction magnification specified by the magnification specifying unit 103. Here, when the thumbnail image display control unit 104 generates a thumbnail image, if the magnification fixing instruction detection unit 105 has not detected an instruction to fix the reduction magnification, the character included in each selected page is displayed. Is replaced with an image indicating the size when the character is reduced at the reduction magnification, and when the magnification fixing instruction detection unit 105 detects an instruction to fix the reduction magnification, the selected character is selected. All characters included in each page are replaced with images reduced at the reduction magnification. Then, the thumbnail image display control unit 104 writes the image data representing the thumbnail image in the VRAM 20 in this way, and then supplies a display start command to the display body control unit 22.

  When the display start command is supplied from the thumbnail image display control unit 104, the display body control unit 22 drives the display element of the memory-type display body 21 based on the image data stored in the VRAM 20. The memory-type display 21 displays an image corresponding to the image data stored in the VRAM 20 when the display element is driven by the display control unit 22.

[Operation]
Next, the operation of the display device 1 will be described.
FIG. 5 is a flowchart showing an operation flow of the display device 1. When the operation button 18 is used by the user to perform an operation for instructing to display a thumbnail image, an instruction to display a thumbnail image is input to the CPU 11 (step S11). When an instruction to display a thumbnail image is input, the CPU 11 specifies a reduction ratio using an initial value (for example, 1/5) stored in the storage unit 14. Then, the CPU 11 writes a thumbnail image group A composed of thumbnail images An (n = 1 to 25) obtained by reducing the number of pages corresponding to the reduction ratio (25 pages in this case) at the reduction ratio to the VRAM 20. The storage content of the VRAM 20 is displayed on the memory-type display 21 by the display control unit 22 (step S12).

  FIG. 6 is a diagram illustrating a display example of the thumbnail image group A. In FIG. 6A, the display content of each thumbnail image An is omitted, and only these outlines are described. In the thumbnail image group A shown in FIG. 6A, 5 rows and 5 columns, that is, 25 pages of thumbnail images An (n = 1 to 25) are arranged in one screen on the display surface of the memory display 21. Configured. In the thumbnail image group A, the thumbnail image A1 which is one page at the upper left in the drawing is enlarged and shown in FIG. As shown in FIG. 6B, the display content of the thumbnail image A1 is a text composed of a plurality of characters. Here, since the reduction ratio of each thumbnail image An is as low as 1/5, the characters included in this image are often crushed and it is difficult for the user to grasp the details of the display contents. However, since each thumbnail image An is displayed as a list, the user can grasp the outline of the display contents of each page and can determine where the thumbnail image An of the desired page is arranged. it can.

  Here, in a state in which the thumbnail image group A shown in FIG. 6A is displayed on the memory display 21, the user holds the electronic pen 2 at the position P1 shown in FIG. 6B, that is, the thumbnail image A1. Assume that the lower right point is close to a distance of 3 cm from the display surface of the memory display 21. When the thumbnail image group A is displayed on the memory display 21, the CPU 11 determines whether or not the electronic pen 2 is within the detection range by the pen detection unit 19 (step S13). For example, when the electronic pen 2 is not brought closer to the detection range of 10 cm from the display surface of the memory-type display body 21, the electronic pen 2 is not detected because it is not within the detection range of the pen detection unit 19. In this case, the CPU 11 determines that the electronic pen 2 is not within the detection range (step S13: NO), and waits until the electronic pen 2 is moved within the detection range.

  On the other hand, when the electronic pen 2 is brought close to a distance of 3 cm from the “position P1” on the display surface of the memory-type display body 21 as in this example, the electronic pen 2 is detected by the pen detection unit 19. Therefore, the CPU 11 determines that the electronic pen 2 is within the detection range (step S13: YES). In this case, the CPU 11 uses the pen detection unit 19 to measure the distance from the display surface of the memory display 21 to the electronic pen 2 and specifies the position of the electronic pen 2 on the display surface (step S14). In this example, “3 cm” is measured as the distance from the display surface of the memory display 21 to the electronic pen 2, and “position P1” is specified as the position of the electronic pen 2. Subsequently, the CPU 11 determines whether or not the measured distance is “0 cm” (step S15). If it is determined that it is “0 cm” (step S15; YES), the position of the specified electronic pen is determined. Is determined on the thumbnail image (step S16). If it is determined that the position of the electronic pen is on the thumbnail image (step S16; YES), the CPU 11 specifies one thumbnail image based on the position of the electronic pen, and the page from which the specified thumbnail image is based. Is displayed on the entire display surface of the memory-type display body 21 by the display body control unit 22 (step S17), and the process is terminated. When determining that the position of the electronic pen is not on the thumbnail image (step S16; NO), the CPU 11 returns the process to step S13.

  On the other hand, if it is determined that the measured distance is not “0 cm” (step S15; NO), the CPU 11 calculates a reduction magnification from the measured distance (step S18). In this example, since the distance measured in step S14 is “3 cm”, the determination in step S15 is negative, and the CPU 11 advances the process to step S18. Specifically, for example, the measured distance “3 cm” is divided by the constant “2 cm” stored in the storage unit 14 (the quotient is “1.5” at this time), and the decimal part is rounded up. To obtain a real number “2”. Then, “1/2”, which is the reciprocal of the obtained real number “2”, is calculated as the reduction magnification. Thereby, the reduction ratio of the thumbnail image is “½” times that of the original page, and the number of thumbnail images to be arranged is determined as 2 rows and 2 columns vertically and horizontally, that is, 4 pages.

  Next, the CPU 11 selects a page to be displayed based on the calculated reduction magnification and “position P1” which is the position of the electronic pen 2 (step S19). Here, as described above, there are four pages arranged on one screen. The CPU 11 specifies the thumbnail image A1 at the upper left of “position P1”, and selects four pages of images including the original page as “pages to be displayed”.

  When the page is selected, the CPU 11 performs a partial layout process (step S20). Partial layout processing means that when a thumbnail image corresponding to each page is generated, if the original page contains characters, only the specified number of characters at the beginning corresponds to the specified reduction ratio. The layout processing is performed, and the remaining characters are replaced with a uniform graphic image indicating the size when the characters are reduced by the reduction ratio. The character layout processing here is to apply a character to a certain range of the display surface. Specifically, for example, if the character is a character in a bitmap font, the bitmap font of the character is changed to the above-described one. For example, the image data is reduced by a reduction ratio and written to the VRAM 20. FIG. 7 is a diagram showing a display surface of the memory-type display 21 after the partial layout process. As shown in the figure, the memory display 21 displays the thumbnail image B1 by reducing the original page of the thumbnail image A1 described above at a reduction ratio of “1/2”. On the memory display 21, the thumbnail image group B composed of the thumbnail images Bm (m = 1 to 4) of four pages from the thumbnail image B1 is arranged and displayed in 2 rows and 2 columns. As for the characters of each thumbnail image Bm, only the predetermined number of characters at the beginning are subjected to layout processing of each character, and the remaining characters are displayed as graphic images representing the size of the characters when reduced at the reduction ratio. □ ”is displayed. Here, the CPU 11 specifies the number of the remaining characters, and arranges the same number of graphic images “□” as the specified number along the document description direction (in this example, horizontal writing). Thereby, the user can roughly grasp the amount of characters on the page by referring to the amount or number of graphic images in the page.

Next, the CPU 11 determines whether or not a magnification fixing instruction for fixing the reduction magnification has been detected (step S21). There are various methods by which the CPU 11 detects this magnification fixing instruction. For example, the CPU 11 uses the built-in timer to compare the above-mentioned reduction magnifications calculated periodically, and when the size of these reduction magnifications does not change over a certain time, the reduction magnification is set. A magnification fixing instruction may be detected as an instruction to fix. That is, when the user passes a certain period while keeping the distance between the electronic pen 2 and the display surface of the memory display 21 constant, the CPU 11 detects the magnification fixing instruction. Further, the CPU 11 may detect that a predetermined operation button 18 of the display device 1 has been pressed by the user as a magnification fixing instruction.
If it is determined that the magnification fixing instruction has not been detected (step S21: NO), the CPU 11 returns the process to step S13 for determining whether or not the electronic pen 2 is within the detection range.

On the other hand, if it is determined that a magnification fixing instruction has been detected (step S21: YES), the CPU 11 performs an overall layout process (step S22). The whole layout process is a process of performing layout processing according to the reduction ratio specified for all characters when the original page includes characters when generating each thumbnail image. FIG. 8 is a diagram showing a display example on the memory-type display body 21 after the entire layout process is performed. As shown in the figure, the memory display 21 is subjected to layout processing for all the characters of the thumbnail image Bm described above. Hereinafter, the thumbnail image that has been subjected to the overall layout process is referred to as a thumbnail image Cm (m = 1 to 4), and an image composed of these thumbnail images Cm is referred to as a thumbnail image group C.
The process of the CPU 11 ends through the above step S22. When an operation for instructing to display a thumbnail image is newly performed, an instruction to display a thumbnail image is input to the CPU 11, and the processes after step S <b> 11 described above are repeated.

As described above, according to the embodiment described above, after the thumbnail image A as shown in FIG. 6A is displayed, when the electronic pen 2 is brought close to the display surface of the memory-type display body 21, The thumbnail image B is displayed at a reduction ratio corresponding to the distance to the electronic pen 2. Thumbnail image B is not subjected to layout processing for some characters, and is displayed by replacing those characters with a uniform image showing the size when reduced at the above reduction ratio. Such calculation time is shortened and display can be performed quickly. Therefore, the user does not have a complicated operation of inputting the reduction ratio using an input unit such as a numeric keypad, but can easily select an arbitrary reduction ratio by moving the electronic pen 2 close to or away from the display surface of the display device 1. Since the thumbnail image reduced in step (b) can be displayed in a display mode that allows the outline to be understood, it is possible to intuitively know the outline of the document and the details of a desired portion. In addition, the reduction magnification instructed to the display device 1 in accordance with this operation fluctuates at a relatively high speed. However, if all thumbnail image contents are reduced and laid out along the reduction magnification, the layout processing is performed. When the processing capacity of the display device is low with respect to the amount, the layout process cannot catch up with the user's operation, and as a result, the display may not catch up with the user's operation. However, as described above, since the display device 1 does not perform layout processing for some characters, the display device 1 can perform quick display following the user's operation and impair the user's intuitive operational feeling. There is nothing.
When the user performs an operation to fix the reduction magnification, the CPU 11 detects a magnification fixing instruction, and a thumbnail image Cm obtained by performing layout processing for all characters is displayed on the display surface of the memory display 21. Is displayed. Since the thumbnail image Cm has been subjected to layout processing for all characters, the user can display the thumbnail image Cm with all contents reduced at a desired reduction ratio and know the contents of each page in detail. Can do.

[Modification]
The above is the description of the embodiment, but the contents of this embodiment can be modified as follows. Further, the following modifications may be combined as appropriate.
(Modification 1)
In the above-described embodiment, the pen detection unit 19 specifies the position of the electronic pen 2 on the display surface of the memory display 21 using the induction electromagnetic method, and uses the electronic pen from the display surface of the memory display 21. Although the distance to 2 was measured, it is not restricted to this. For example, the pen detection unit 19 may be a touch panel and an ultrasonic sensor. In this case, the touch panel is disposed on the display surface of the memory display body 21. In this modification, the electronic pen 2 is not necessarily used. For example, the user's finger may be brought closer to the display surface of the memory display 21. In this case, the user's finger serves as an instruction means. The pen detection unit 19 specifies the position of the instruction unit on the display surface of the memory-type display body 21 using the touch panel and detects the contact position of the instruction unit on the display surface. In addition, the pen detection unit 19 uses an ultrasonic sensor to measure the reflection when the ultrasonic wave is irradiated perpendicularly to the display surface of the memory display 21, thereby displaying the display surface of the memory display 21. Measure the distance from the pointing means.

(Modification 2)
In the above-described embodiment, the thumbnail image is generated by the CPU 11, but the present invention is not limited to this. For example, image data representing thumbnail images may be stored in the storage unit 14 in advance. In this case, the CPU 11 may read image data representing a thumbnail from the storage unit 14 in steps S20 and S22 described above.

(Modification 3)
In the above-described embodiment, the magnification fixing instruction is detected by the CPU 11 when a certain period of time elapses while the user keeps the distance between the electronic pen 2 and the display surface of the memory display 21 constant. . That is, the magnification fixing instruction is detected when the size of the reduction magnification specified by the CPU 11 that is the magnification specifying means does not change over a certain period of time. However, if other conditions are satisfied, the magnification is A fixing instruction may be detected. For example, the magnification fixing instruction may be detected when an operation button provided on the electronic pen 2 is pressed. In this case, each of the display device 1 and the electronic pen 2 is provided with a communication unit for exchanging data with infrared rays, and the electronic pen 2 is provided with an operation button for instructing to fix the reduction magnification. When the operation button is pressed in step 2, a signal corresponding to the operation button may be transmitted to the display device 1 by the communication unit. In this case, the operation buttons provided on the electronic pen 2 and the communication units provided on the display device 1 and the electronic pen 2 function as operation means for accepting a user's operation.

  In the embodiment described above, the CPU 11 functioning as the magnification specifying unit 103 calculates the reduction magnification from the distance measured according to a predetermined algorithm when specifying the reduction magnification of the thumbnail image. The reduction ratio of the thumbnail image may be specified. For example, the storage unit 14 may store a table representing the correspondence between the distance from the display surface of the storage-type display body 21 to the electronic pen 2 and the reduction magnification. In this case, the CPU 11 may specify the reduction ratio corresponding to the distance measured by the pen detection unit 19 by referring to this table.

(Modification 4)
In the above-described embodiment, only the layout process in which the reduction ratio is changed for each character in the document and each character after the change is arranged in the display area is described. However, the layout process is not limited to the character. For example, reduction processing for other images such as photographs and figures is also included in this layout processing. In other words, the layout process only needs to be a process for changing the reduction magnification of the image displayed on the display device 1 and arranging the image after the change in the display area.

(Modification 5)
In the embodiment described above, when the CPU 11 displays the thumbnail image group B, the remaining characters excluding the predetermined number of characters at the beginning are displayed by being replaced with the number of graphic images corresponding to the number of characters. The number of graphic images to be replaced may not be the same as the number of remaining characters. An area that should be occupied by the remaining characters may be identified from the total number of remaining characters and the width and height of each character, and the graphic image described above may be arranged in this area. Further, such replacement processing does not have to be performed in units of characters, and the graphic image is not limited to “□”. For example, a horizontal line may be displayed if the document is written horizontally, and a vertical line may be used if the document is written vertically. In this case, the CPU 11 recognizes the number of lines of the remaining characters and the horizontal / vertical writing of the document, and arranges horizontal lines or vertical lines corresponding to the number of lines in the area where the remaining characters are to be displayed. do it. That is, an area where the remaining characters are to be displayed is specified, and the area may be filled with a predetermined graphic image.

(Modification 6)
In the embodiment described above, when it is determined in step S21 that a magnification fixing instruction for fixing the reduction magnification has been detected, the CPU 11 performs the overall layout process according to the reduction magnification specified for all characters. Although layout processing has been performed, it is not necessary to perform layout processing for all characters at this time. For example, it is not necessary to perform the layout process again for characters that have been reduced in the partial layout process performed before the entire layout process. Specifically, during the partial layout process, the CPU 11 reduces a part of the image of each page with the specified reduction ratio and displays it on the memory display 21 and replaces it with an image other than this part. A graphic image having a size corresponding to the reduction magnification is displayed. Then, during the entire layout process, the CPU 11 performs the above-described reduction during the partial layout process while displaying a part of the graphic image, and displays the graphic image at the other reduction ratios. What is necessary is just to replace and display with the reduced image. In this way, the CPU 11 can reduce the processing time because it is not necessary to perform the layout process again for a part of the layout process that has been reduced once.

(Modification 7)
In the embodiment described above, the processing performed by the pen detection unit 19 may be executed by the CPU 11 according to a program. Each program executed by the CPU 11 of the display device 1 is a recording medium readable by a computer device such as a magnetic recording medium such as a magnetic tape or a magnetic disk, an optical recording medium such as an optical disk, a magneto-optical recording medium, or a semiconductor memory. It may be provided in a state stored in a medium. It is also possible to download this program via a network such as the Internet. A module other than the CPU 11 described in the embodiment may perform part of the processing performed by the CPU 11 instead of the CPU 11.

It is a figure which shows the external appearance of the display apparatus which concerns on embodiment. It is a figure which shows the hardware constitutions of the said display apparatus. It is a figure explaining the mechanism in which the pen detection part of the said display apparatus detects an electronic pen. It is a figure which shows the function structure of the said display apparatus. It is a flowchart which shows the flow of operation | movement of the said display apparatus. It is a figure which shows an example of the thumbnail image produced | generated by the said display apparatus. It is a figure which shows the mode after performing a partial layout process with the said display apparatus. It is a figure which shows the mode after performing the whole layout process with the said display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 11 ... CPU, 12 ... ROM, 13 ... RAM, 14 ... Memory | storage part, 15 ... Power supply, 16 ... Power supply control part, 17 ... Input / output part, 18 ... Operation button, 19 ... Pen detection part, 20 DESCRIPTION OF SYMBOLS ... VRAM, 21 ... Memory | storage display body, 22 ... Display body control part, 101 ... Distance measurement part, 102 ... Position specification part, 103 ... Magnification specification part, 104 ... Thumbnail image display control part, 105 ... Magnification fixed instruction | indication detection part 2 ... Electronic pen.

Claims (6)

Display means having a display surface;
Distance measuring means for measuring the distance from the display surface of the display means to the operator operated by the user;
A magnification specifying means for specifying a reduction magnification when displaying an image of each page included in the document data in a reduced manner according to the distance measured by the distance measuring means;
When the size of the reduction magnification specified by the magnification specifying means changes, a part of the image of each page is reduced at the reduction magnification and displayed on the display means, and then the image of each page is displayed. And a reduced image display control means for reducing the whole image at the reduction magnification and displaying the reduced image on the display means. The reduced image display control means reduces a part of the image of each page at the reduction ratio and displays it on the display means, and then the size of the reduction ratio specified by the magnification specifying means is set to a predetermined time. 2. The display device according to claim 1, wherein when the change does not occur, the entire image of each page is reduced by the reduction ratio and displayed on the display unit. Comprising an operation means for accepting a user's operation;
The reduced image display control means reduces a part of the image of each page at the reduction magnification and causes the display means to display the image, and when a predetermined operation is accepted by the operation means, The display device according to claim 1, wherein an entire image of each page is reduced by the reduction ratio and displayed on the display unit. When the reduced image display control means reduces a part of the image of each page at the reduction magnification and displays the image on the display means, the reduced image display control means changes the size according to the reduction magnification instead of the image other than the part. The display device according to claim 1, wherein the graphic image is displayed. The reduced image display control means reduces the graphic image while reducing a part of the image of each page at the reduction ratio and displaying the image on the display means at a reduction ratio. The display device according to claim 4, wherein the entire image of each page is displayed on the display means by replacing the image with the displayed image. Computer
A magnification specifying means for specifying a reduction magnification when the image of each page included in the document data is reduced and displayed according to the distance from the display surface of the display means to the operator operated by the user;
When the size of the reduction magnification specified by the magnification specifying means changes, a part of the image of each page is reduced at the reduction magnification and displayed on the display means, and then the image of each page is displayed. For causing the display unit to function as a reduced image display control unit that displays the image on the display unit after being reduced at the reduction ratio.

Images