JP3582866B2 - Image display device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an image display device, and more particularly to an image display device that continuously performs enlargement or reduction and redisplay of an image displayed on a screen.
[0002]
Materials taken in by the image scanner have been exchanged through a network or the like, and with this, applications for displaying such materials in an easy-to-read form have been developed. For example, when a newspaper is read in pages by an image scanner and converted into image data, if the entire page is displayed on the display screen, the characters are too small to read the contents. For this reason, the relevant article part is usually displayed in an enlarged manner.
[0003]
[Prior art]
FIG. 8 shows an example of a conventional image enlarging method. For example, it is assumed that the entire image 1 is displayed on the display screen, and that the image 1 includes the display target unit 2. Here, in order to display the vicinity of the display target portion 2 in the image 1 in detail, enlargement processing of the image 1 is performed. In the enlargement processing, the upper left position as the origin of the image 1 is fixed, and the image 1 is enlarged so as to spread rightward and downward from this position.
[0004]
Since the enlarged image 1a is enlarged from the origin of the image 1, the display target portion 2a is also enlarged while moving in the enlargement direction. As described above, when the entire image 1 is enlarged in order to display the details of the display target unit 2, the display target unit 2a moves to a position different from the position where the display target unit 2 was displayed and is displayed. Will be. If the movement becomes large, the display target portion 2a may protrude from the display screen. By using, for example, a scroll bar to display a portion that is off the screen, the enlarged image 1a is moved to an arbitrary position on the display screen, and the target display target unit 2a is brought to the center of the screen. be able to.
[0005]
Further, according to another example of the conventional method of enlarging an image, there is a method of setting the center position of the image as a fixed position of the enlargement. That is, when a certain image is enlarged, the image is enlarged so as to expand in all directions from the center position. Also in this enlargement method, a portion deviating from the center position of the image moves in four directions from the original position while being enlarged. Also in this method, when the display target portion deviating from the center position of the image deviates from the screen by the enlargement processing, the display target portion can be moved into the display screen by scrolling the image.
[0006]
Conversely, when reducing the displayed image, the display target moves toward the origin or center position of the image while being reduced. Also in this case, the image can be moved to an arbitrary display position by scrolling the reduced image.
[0007]
[Problems to be solved by the invention]
When the image is enlarged or reduced according to the conventional enlargement or reduction method, if the display target part is located away from the center of the image enlargement, the display target part moves on the screen due to the enlargement or reduction processing. In order to return the target portion to the original display position, a scroll operation must be performed without fail, and more scroll operations are required as the display target portion is located at the end of the image.
[0008]
The present invention has been made in view of such a point, and an object of the present invention is to provide an image display device that enlarges or reduces an image so that a scroll operation is not required later.
[0009]
[Means for Solving the Problems]
FIG. 1 is a principle diagram of the present invention for achieving the above object. The image display apparatus of the present invention shown in FIG. 1 includes an input unit 10 for inputting a center position of enlargement or reduction of an image, an image resizing unit 11 for enlargement or reduction of an image, and before and after enlargement or reduction of an image. The image position correcting means 12 for correcting the position of the enlarged or reduced image by the difference between the center positions of the images, the display means 13 for displaying the position-corrected image, and the instruction to change the size of the enlarged or reduced image are input. It comprises an image display control means 14 for repeatedly operating the image size changing means 11, the image position correcting means 12 and the display means 13.
[0010]
[Action]
According to the above-mentioned means, when the center position of the enlargement or reduction of the image is input by the input means 10, the image size changing means 11 enlarges or reduces the displayed image. The image position correcting means 12 enlarges or reduces the difference between the center positions before and after the enlargement or reduction that occurs when the image size changing means 11 enlarges or reduces the image based on the center position input by the input means 10. The position of the subsequent image is corrected, and the position-corrected image is displayed on the display unit 13. Then, the image display control means 14 repeatedly performs the enlargement or reduction of the image, the correction of the position of the image after the enlargement or reduction, and the display of the image after the correction, so that the input position is centered. A continuous enlargement or reduction process of the obtained image is performed.
[0011]
【Example】
First, an outline of an embodiment of the present invention will be described.
FIG. 1 is a diagram showing the principle configuration of an image display device according to the present invention. The image display device according to the present invention includes an input unit 10 for inputting a center position of an image being displayed when the image is enlarged or reduced, an image size changing unit 11 for enlarging or reducing the displayed image, Image position correcting means 12 for correcting the position of the image after the enlargement or reduction by the difference between the center position input by the input means 10 and the center position after the enlargement or reduction of the image, and an image whose position has been corrected And an image display control means 14 for repeatedly operating the image size changing means 11, the image position correcting means 12 and the display means 13 while an enlargement or reduction size change instruction is input. .
[0012]
According to this configuration, the input unit 10 inputs the center position of the enlargement or reduction of the image displayed on the display unit 13. The image size changing unit 11 enlarges or reduces the image displayed on the display unit 13. The image position correcting means 12 corrects the position of the image after the enlargement or reduction by the difference of the shift of the center position input by the input means 10 when the image is enlarged or reduced by the image size changing means 11. The position-corrected image is displayed by the display unit 13. The image display control means 14 controls the enlargement or reduction of the image by the image size changing means 11, the correction of the position of the image after the enlargement or reduction by the image position correction means 12, and the display of the corrected image by the display means 13. By repeatedly performing the processing, continuous enlargement or reduction processing of the image centered on the center position input by the input unit 10 is performed.
[0013]
The input means 10 is preferably a mouse. The mouse can input not only a center position of a portion to be enlarged or reduced with respect to the image displayed on the display means 13 but also an instruction to change the size of the image to be enlarged or reduced. Therefore, a two-button mouse that can input an instruction for enlargement or reduction is preferable as the input unit 10. Therefore, while the mouse button is pressed, the enlargement or reduction of the image around the pressed position can be repeated. The image size changing means 11 virtually enlarges or reduces the image on a logical screen with its origin as a fixed point using a normal enlargement or reduction method. The result of this processing is not immediately reflected on the screen display. The image position correcting means 12 calculates a difference between the center positions before and after enlargement or reduction for position correction. This difference is calculated by multiplying the coordinates of the center position input by the input unit 10 by a magnification that can be enlarged or reduced by the image size changing unit 11 at a time. Next, the enlarged or reduced image is returned to the direction in which it has moved by the difference between the center positions, and is displayed on the display unit 13.
[0014]
FIG. 2 is a diagram showing a display example of an image display screen. According to this screen display example, reference numeral 21 denotes a window formed on a part of a display screen of a monitor, for example, and an image 22 is displayed in the window 21. The image 22 is, for example, one page of a newspaper converted into image data by an image scanner. A mouse cursor 23 is displayed on the image 22.
[0015]
The position in the window 21 is represented by coordinate values in a display coordinate system with the upper left position of the window 21 as the origin (0, 0). Therefore, the position of the mouse cursor 23 when it is within the window 21 is represented by the display coordinate system. The image 22 displayed in the window 21 has the upper left position as the origin of the image 22 and the coordinates (x, y). The coordinates of the specific position in the image 22 are represented by an image coordinate system with the origin at the upper left position of the image 22. The coordinates (x, y) of the origin have a negative value when the image 22 is enlarged and protrudes from the upper frame and the left frame of the window 21.
[0016]
When the mouse button is pressed by placing the mouse cursor 23 at the position on the image 22 where the user wants to enlarge or reduce, the pointed position is obtained as the coordinate values (MDx, MDy) of the display coordinate system. 12 is the center position of the enlargement or reduction. The image 22 is enlarged or reduced around this center position. Hereinafter, this operation is called point zoom.
[0017]
FIG. 3 is a first explanatory diagram of the point zoom process. Here, a case where the image is enlarged will be described. In FIG. 3, the image 30 before the point zoom is performed is shown by a solid line. The upper left position of the image 30 is the coordinates (x, y) of the display coordinate system. The position P0 on the image 30 is the position pointed by the mouse, and is the center position of the enlargement.
[0018]
Here, if virtual enlargement processing of the image 30 is performed, that is, processing of enlarging on a logical screen without performing screen display, an image 31 enlarged around the origin of the image 30 is generated. . This image 31 is indicated by a broken line. When the enlargement process is performed, the position P0 pointed by the mouse is moved to the position P1. The logical movement amount from the position P0 to the position P1, that is, the difference can be obtained by calculation.
[0019]
In order to calculate the movement amount, first, the coordinates of the position P0 designated by the mouse in the image coordinate system are calculated, that is, coordinate conversion is performed. The coordinates (IMGx, IMGy) of the pointed position P0 with the upper left of the image 30 as the origin are obtained by the following equation.
[0020]
(Equation 1)
IMGx = MDxx-x (1a)
IMGy = MDy-y (1b)
Next, the movement amounts Δx and Δy from the position P0 to the position P1 are obtained by multiplying IMGx and IMGy by a magnification of enlargement. Specifically, it is obtained by the following equation.
[0021]
(Equation 2)
Δx = IMGx ÷ number of x dots before enlargement × (number of x dots after enlargement−number of x dots before enlargement) (2a)
Δy = IMGy ÷ number of y dots before enlargement × (number of y dots after enlargement−number of y dots before enlargement) (2b)
FIG. 4 is a second explanatory diagram of the point zoom process. In FIG. 4, the image 31 that has been virtually enlarged is indicated by a broken line. At this time, since the position P0 previously pointed by the mouse is at the position P1, next, the image 31 is moved so that the position P1 coincides with the position P0, and the position of the image 31 is corrected. That is, the position of the origin for displaying the image 31 is changed from (x, y) to (x-Δx, y-Δy). Thereby, the point position by the mouse moved by performing the enlargement processing is returned to the original position, and the image can be enlarged by fixing the designated position by the mouse. Thereafter, the position of the origin of the image 31 is updated as follows.
[0022]
(Equation 3)
x ← x−Δx (3a)
y ← y−Δy (3b)
FIG. 5 is a flowchart showing the flow of the continuous zoom process. An example of this processing uses a mouse having two buttons on the left and right. When one of the buttons of the mouse is pressed down, the position is positioned as the center of the point zoom, and the pressed button is on the left side. Whether to enlarge or reduce is determined depending on whether the image is on the right side or the right side, and the point zoom processing is repeated until the pressed button is released to perform continuous zoom processing.
[0023]
First, it is determined whether or not a mouse button has been pressed, and if not, the process ends (step S1). When the mouse button is pressed, the coordinates (MDx, MDy) of the mouse cursor when the button is pressed are stored as the zoom center position (step S2). Next, it is determined whether the pressed mouse button is the left button (step S3). Here, if it is determined that the left button has been pressed, a flag for enlargement processing is set (step S4), and if it is determined that the right button has been pressed, a flag for reduction processing is set. (Step S5). Thereafter, the timer is started (step S6).
[0024]
Next, while the timer is running, it is determined whether or not the pressed mouse button has been released (step S7). If the mouse button has been released at this stage, the timer is cancelled. Then (step S8), the zoom processing ends. If the mouse button is not released and the timer times out (step S9), a point zoom process is performed (step S10). Here, when a series of point zoom processes is completed, the process returns to step S6 to start a timer, and checks whether or not a mouse button is released until the timer expires. Further, a process of performing a series of point zoom processes is repeated.
[0025]
FIG. 6 is a flowchart showing a detailed flow of the point zoom process. In the point zoom process, first, coordinate conversion is performed to determine where the previously stored zoom center position is in coordinates in the image (step S11). This coordinate conversion is performed according to the above-described equations 1a and 1b.
[0026]
Next, it is determined whether the set flag is a flag for the enlargement process (step S12). Here, if the flag for enlargement processing is set, virtual enlargement processing that is performed in a state in which display is not performed is performed (step S13), and if the flag for reduction processing is set, virtual reduction is performed. The process is performed (Step S14).
[0027]
Here, the movement amount of the point position caused by performing the zoom processing is calculated (step S15). This calculation is performed according to the above-described equations 2a and 2b in the case of the enlargement processing.
[0028]
Then, the position of the image is corrected by moving the image by the calculated movement amount so that the point positions match even after the zoom processing (step S16). Next, the image is displayed with the position-corrected coordinates (x-Δx, y-Δy) (step S17). Finally, the position coordinates (x, y) of the origin of the image are changed to (x-Δx, y-Δy). ) (Step S18).
[0029]
The zoom magnification processed in step S13 or step S14 is, for example, about 5%. That is, assuming that the total time required for the timer to start and time out and the time required for one point zoom process is 0.5 seconds, for example, while the mouse is pressed, the image is displayed at 5% every 0.5 seconds. It will be continuously enlarged or reduced.
[0030]
In the illustrated example, the movement amount calculation is performed after the enlargement or reduction processing. However, the order may be changed. That is, step S15 of the movement amount calculation may be performed before step S12. This is because the calculation of the movement amount does not use the result of the enlargement or reduction processing.
[0031]
FIG. 7 is a diagram illustrating an example of a hardware configuration of a computer system that embodies the present invention. In the figure, a computer system includes a processor 51, a read-only memory (ROM) 52, a main memory (RAM) 53, a graphic control circuit 54 and a display device 55, a mouse 56, a keyboard 57, and a hard disk device (HDD). ) 58, a floppy disk drive (FDD) 59, and a printer 60, and these components are mutually connected by a bus 61.
[0032]
The processor 51 controls the entire computer system. The read-only memory 52 stores, for example, a program required at startup. The main memory 53 stores a system program, an application program for image display, a program for executing a point zoom function, and the like, and also stores image data to be subjected to a point zoom process.
[0033]
The graphic control circuit 54 has a video memory and the like, converts a window screen for image display, various icons, and the like into display signals and sends them to the display device 55. The display device 55 displays a window screen for displaying an image based on the received display signal.
[0034]
The mouse 56 moves the mouse cursor displayed on the screen of the display device 55, and points to the zoom center position by clicking a button, instructs start or end of zoom, and commands of various icons or menus. Is a pointing device for selecting and instructing the user. The keyboard 57 is used to input a character string of an image file name, to instruct enlargement or reduction in place of a mouse, and the like.
[0035]
The hard disk device 58 stores a system program, an application program for image display, a program for executing the point zoom function, an image file containing image data, and the like. The floppy disk device 59 is an external storage device for taking an image file stored in the floppy disk 59a into the hard disk device 58, and for storing an image file downloaded over a network, for example.
[0036]
Further, by using the print function of the image display application program, the image data of the specific area subjected to the point zoom process can be transferred to the printer 60 and printed on paper.
[0037]
【The invention's effect】
As described above, in the present invention, the center position of the displayed image to be enlarged or reduced is input, the enlargement or reduction is performed, and the center positions of the images before and after the enlargement or reduction are corrected. Enlargement / reduction can be performed without moving the designated center position of the enlargement / reduction processing on the display.
In addition, the image size change and image position correction are repeatedly performed while the enlargement or reduction size change instruction is input. The instruction for enlargement / reduction is continued without moving.
For this reason, even if the zoom operation is performed, the designated center position does not change, so that it is not necessary to perform the scroll operation one by one after the zoom operation, and it is possible to simplify the zoom operation of the specific point of interest of the image.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating the principle configuration of an image display device according to the present invention.
FIG. 2 is a diagram showing a display example of an image display screen.
FIG. 3 is a first explanatory diagram of a point zoom process.
FIG. 4 is a second explanatory diagram of the point zoom process.
FIG. 5 is a flowchart illustrating a flow of a continuous zoom process.
FIG. 6 is a flowchart illustrating a detailed flow of a point zoom process.
FIG. 7 is a diagram illustrating an example of a hardware configuration of a computer system that implements the present invention.
FIG. 8 is a diagram showing an example of a conventional image enlarging method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Input means 11 Image size change means 12 Image position correction means 13 Display means 14 Image display control means

Claims (2)

Input means for inputting the center position of enlargement or reduction of the displayed image;
Image resizing means for performing processing of enlarging or reducing the image with the origin of the displayed image as a fixed point ,
Enlarged or by correcting the magnification or by the difference between the center position after shrink, the display position of the image enlarged or reduced by the image size changing means of the center position input by the input means image The enlarged or reduced image is moved so that the center position after the reduction matches the center position input by the input means, and after the display position of the image is corrected, the origin of the image is corrected after the correction. Image position correction means for updating to the coordinates of the origin of the image,
A display means for displaying the image subjected to the correction of the display position,
An image display device comprising: an image display control unit that repeatedly operates the image size changing unit, the image position correcting unit, and the display unit while an input of a size change instruction for enlargement or reduction is input. 2. The image display device according to claim 1, wherein the input unit further inputs a size change instruction for enlarging or reducing the image.

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