JPH11219160A - Image display device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To make it easy to see a reduced or enlarged display image of an image including characters and figures. SOLUTION: In an image display device provided with a display means for displaying an image including characters and figures and an image display control means for reducing or enlarging the image, the image display control means reduces or enlarges the image. Then, after reducing the area where characters or figures are not actually drawn, reduction or enlargement processing is performed on the drawing area. In other words, by extracting the drawing area 902 from the original image 901 and reducing and enlarging the margin area after filling the margin area, the collapse of the reduced image is reduced, and the necessary image is enlarged and displayed. To make it easier to see.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly to an image display device having an image reduction or enlargement display function.

[0002]

2. Description of the Related Art When an image including characters and figures is larger than a display screen and the image is to be displayed at one time, an image display apparatus performs reduction processing on the entire image and displays the image. It has a display function. As a method of this image reduction processing, for example, pixels (dots) constituting an image
There is a method of thinning out the lines for every fixed number of lines in which

FIG. 1 shows an example of such an image reduction processing method.
This will be described with reference to FIG. FIG. 1 shows an example in which an image of horizontal X1 dots and vertical Y1 dots is reduced to an image of horizontal X2 dots and vertical Y2 dots. As a specific example, X1 = 100, Y1
A case will be described in which an image of 100 is reduced to an image of X2 = 30 and Y2 = 30 and displayed.

As shown in FIG. 1A, in order to reduce an image 101 of 100 dots vertically to an image 102 of 30 dots vertically, 70 (= 100−30) lines may be thinned. Similarly, in the horizontal direction, by thinning out 70 lines, the image 103 can be reduced to an image 103 of 30 dots vertically and 30 dots horizontally.

In the case where lines are evenly thinned and reduced in the vertical direction, as shown in FIG. 1 (b), in order to evenly thin out 70 lines from 100 lines, one out of 100/70 lines is required. What is necessary is to thin out in proportion. That is, one line may be thinned out for each multiple of 100/70. Actually, since the line numbers are integers, the lines with numbers corresponding to the integer part of a multiple of 100/70 are thinned out. 100
The multiple of / 70 is 0, 1.4, 2.8, 4.2, 5.7.
.., The 0, 1, 2, 4, 5,..., Line 104 corresponds to a thinned line. The hatched line 104 is a thinned line. These lines 104
, And moving the remaining lines to the top, an image 105 reduced in the vertical direction is obtained.

In a similar manner, as shown in FIG.
The horizontal direction of the image 105 is reduced by thinning out the diagonal vertical lines 106, and as a result, an image 107 reduced in both the vertical and horizontal directions is completed.

When an image is to be enlarged and displayed on an image display device having an image enlargement display function, the image is enlarged by uniformly adding lines.

[0008]

However, in such a conventional image reduction display method, even in an area where characters or figures are not drawn, the image is uniformly thinned and reduced.
There is a disadvantage that the drawing area in which characters and figures are drawn is crushed by the reduction and becomes difficult to see.

Further, in the conventional image enlarged display method, an area in which characters and figures are not drawn is also enlarged, so that important characters and figures are insufficiently enlarged.

It is, therefore, an object of the present invention to provide an image display device in which characters and figures are less crushed by reduction.

Another object of the present invention is to provide an image display device capable of displaying characters and graphics in a sufficiently enlarged manner.

[0012]

In order to achieve the above object, a first means comprises a display means for displaying an image containing characters and figures, and an image display control means for reducing or enlarging the image. In the image display device, the image display control means performs reduction or enlargement processing on the drawing area after reducing an area where characters or figures are not actually drawn when reducing or enlarging the image. I do.

The second means is that the image display control means in the first means detects a drawing area when reducing or enlarging an image, and when a plurality of drawing areas are detected, the drawing areas are detected. And moving at least one of the drawing areas to reduce the distance from the other drawing area.

The third means checks the drawing area in the second means for each horizontal line of the image data to see if there is a drawing dot in the line from the top. A process in which the line where the drawing dot is found is set as the upper end of the drawing region, and the line where the drawing dot is found is set as the lower end of the drawing region to extract the vertical drawing region of the original image. It checks sequentially from the left end whether there is a drawing dot in the line, the first line where the drawing dot is found is set as the left end of the drawing area, and the last line where the drawing dot is found is set as the right end of the drawing area, the original image And a process of extracting a drawing area in the horizontal direction.

A fourth means is the image processing apparatus according to the second means, wherein the image display control means sets a margin between adjacent drawing areas when reducing the distance from another drawing area. .

According to a fifth aspect, in the fourth aspect, the margin is provided by uniformly setting a predetermined number of lines.

According to a sixth aspect, in the fourth aspect, the margin is provided at a predetermined ratio with respect to the vertical or horizontal length of the cut drawing area.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of an image display device showing an embodiment of the present invention. This image display device can be realized by a computer system having image reduction and enlargement display functions. In FIG. 2, 201 is C
PU, 202 is a tablet input device, 203 is a liquid crystal display device (LCD display device), 204 is a memory, 205 is I
A tablet input device 202, a liquid crystal display device 203, a memory 204, and an I / O port 205 are connected to the CPU 201 via a bus 206.
In this embodiment, the liquid crystal display device 203 functions as a display unit, and the CPU functions as an image display control unit.

FIG. 3 is a flowchart of an image display process executed by the CPU 201.

The image display function of the image display device shown in FIG. 2 will be described with reference to the flowchart of FIG. One or more image data including characters and figures are stored in the memory 2.
04.

When the image display device is started (step 30)
1), the CPU 201 displays a menu on the LCD display device 203 (step 302). When the user selects a menu item using the tablet input device 202 (step 303), the CPU 201 determines the selected menu item (step 304) and executes a corresponding process (step 305).

If the selected menu item is a reduced list display, the CPU 201 executes a reduced list display (step 306). Then, when the user selects one of the displayed images with the tablet input device 202 (step 307), the CPU 201 displays the selected image (step 308). Thereafter, the user can edit the displayed image and save the edited image data in the memory 204.

FIGS. 4 to 7 show four examples of images including characters and figures. It is assumed that the data of these four images is stored in the memory 204. FIG.
8 is an example of a conventional image reduction display method in which the images in FIG. 7 are uniformly reduced and displayed in a list.

Next, a method of reducing an image in the image display device of the present embodiment will be described with reference to FIG.

In this method, first, as shown in FIG. 9B, a drawing area 902 which is actually drawn is extracted from the original image 901 of FIG. 9A. Next, an area 904 in which a margin 903 is added to the extracted drawing area 902 as shown in FIG. 9C is cut out, and only this cutout area 904 is subjected to reduction processing as shown in FIG. Reduction processing is performed according to the size (vertical or horizontal length) of the area 905 to obtain a reduced image 906.

At this time, if only the drawing area 902 is simply reduced as shown in FIG. 7E, the reduced image 906 comes into contact with the frame of the screen as shown in FIG. In order to prevent this, a cutout area 904 to which a blank 903 is newly added is formed around the drawing area 902.
When the drawing area 902 is cut out as in the cutout area 904, a reduction process may be performed after providing a new margin 903, or only the drawing area 902 may be cut out and a new margin 907 may be cut out.
Is reduced in accordance with the area inside the new margin 907 of the area 908 of the reduction destination to which the
09 may be formed.

The width of the new margin is not limited to a constant value such as 5 lines uniformly, and also the original image 901 such as 5% of the larger vertical or horizontal length of the extracted drawing area 902.
Or the size of the drawing area 902 or the area 908 to be reduced, or the reduction ratio.

In this embodiment, the extracted drawing area 9
02 or the area 904 in which a new margin 903 is added to the drawing area 902 is the same as the vertical / horizontal ratio of the area 905 to be reduced or the area 909 excluding the new margin 907 therefrom.
If the ratio is larger than the width ratio, the height is adjusted to the reduction destination, and if it is smaller, the width is adjusted to the reduction destination and the vertical and horizontal reduction ratios are the same, but the vertical and horizontal reduction ratios are not the same. May be.
For example, the vertical reduction rate may be the vertical length of the reduction destination / the vertical length of the drawing area, and the horizontal reduction rate may be the horizontal length of the reduction destination / the horizontal length of the drawing area.

FIG. 10 is an explanatory diagram of a method of extracting (identifying) a drawing area in the image reduction processing shown in FIG. First, a vertical drawing area of the original image 1001 is extracted as shown in FIG. The extraction of the drawing area in the vertical direction is performed by sequentially checking horizontal lines (0, 1, 2,...) Of the image data from the top. The content to be checked is whether there is a drawing dot in the line.

The presence or absence of a drawing dot is checked for each line.
2 is set as the upper end of the drawing area (FIG. 10B), and the line 1003 where the drawing dot is finally found is detected as the lower end of the drawing area (FIG. 10C). Thus, the drawing area 1
The upper and lower ends of 004 are extracted from the original image 1001. The hatched lines 1002 and 1003 are the drawing area 100
4 are the upper end and the lower end (FIG. 4D).

Next, as shown in FIG. 3E, the drawing area is extracted in the horizontal direction with respect to the drawing area 1004 extracted in the vertical direction. This method is performed by checking the presence / absence of drawing dots sequentially from the left for each vertical line (0, 1, 2,...), Similarly to the vertical extraction. From this result, the left end line 1005 and the right end line 1006 of the drawing area 1004 are detected, and the extraction (specification) of the drawing area 1004 is completed.

FIG. 11 is a flowchart of the vertical extraction process in the drawing area extraction process shown in FIG.

When activated (step 1101), first,
To check from the top line, "0" is set to the variable of "line number". Also, “0” is set in the “drawing area upper end detection flag” (step 110).
2). Then, as a result of checking whether or not there is a drawing dot in the “line number” line (step 1103),
If there is a drawing dot in that line (step 110
4) Check "drawing area upper end detection flag" (step 1)
105) If it is “0”, the value of “line number” is entered in the “top of drawing area” variable, and “1” is set in the “drawing area top detection flag” (step 1106). In this process, the number of the first line where the drawing dot is located is stored in the “top of drawing area” variable.

If there is a drawing dot in the line, the value of the "line number" is unconditionally set to the "lower end of the drawing area" (step 1107). By repeating this process, each time a line with a drawing dot is detected, the number of that line is entered in the “bottom of the drawing area”. Enter the "bottom of" variable.

Next, "1" is added to the variable of "line number" (step 1108), and the next line is checked. When this check processing reaches the line at the lower end of the screen (step 1109), this processing ends (step 1110).

FIG. 12 is an example of a reduced list display by the reduced image display method in the image display device of the present invention. Compared with the reduced list display image by the conventional method (see FIG. 8),
It can be seen that the image is displayed large and easy to see. In this example, since the range of the drawing area of the image shown in FIG. 6 is smaller than the range of the reduction destination, the image is displayed without being reduced. In such a case, the image is enlarged according to the size of the reduction destination area. You may do it.

FIG. 13 is an explanatory view showing another embodiment of the image reducing method in the image display device of the present invention. This embodiment assumes reduction of an image such as a memo over a plurality of lines.

In this example, first, the screen of the original image 1301 shown in FIG. 13A is checked in the vertical direction, and a drawing area 1302 is extracted as shown in FIG. 13B. Here, each drawing area 1302 is set in the first row,
The second line is called with a number, and so on.
Blank areas 1303 other than 302 are called an upper margin, a line gap, and a lower margin, respectively.

Next, as shown in FIG. 10C, the extracted lines (drawing area 1302) are packed up (blank area 130).
3 to make the moving drawing area 1304. At this time, if the lines are simply packed, the frames on the screen and the lines or the lines contact each other, making it difficult to see. In order to prevent this, a new margin 1305 is newly provided between the screen frame and the line and between the lines after the lines are packed up. These margins 1
305 are called a new upper margin and a new line spacing, respectively.

The width of the new top margin and new line spacing 1305 is
In addition to using a constant, such as 5 lines uniformly, the vertical length of the line above or below the margin, such as 5% of the vertical length of the line below the margin, or the sum or average thereof You may decide. Further, the width of the new upper margin and the width of each new line may not be all the same.

Next, the drawing area 1306 is extracted by checking in the horizontal direction for each extracted row as shown in FIG. Here, each drawing area 1306 is called with a number such as the first character and the second character, and a margin area 1307 other than the drawing area 1306 is specified, and these are respectively called a left margin, a space between characters, and a right margin. By performing such processing for each row, the image 13 in which the drawing area 1306 and the margin area 1307 are specified in the horizontal direction for each row is obtained.
08 is formed.

Next, an image 1309 is formed by moving the specified (extracted) character (drawing area) 1306 to the left as shown in FIG. At this time, the character 1
If the 306 is packed, the frame of the screen and the character, or the character and the character contact each other, making it difficult to see. To prevent this, a new margin 1310 is added between the characters of the screen and the characters and between the characters after the characters 1306 are left-justified. These are called a new left margin and a new character space, respectively. The width of the new left margin and the space between the new characters 1310 are not limited to a constant such as 5 lines uniformly, but may be 5% of the horizontal length of the character on the right side of the margin or the like. It may be determined by the horizontal length of the character, or the sum or average thereof. In addition, the width between the new left margin and each new character may not be the same. By performing such processing for each row, an image 1311 is formed.

Finally, as shown in FIG.
11 is a cutout image 1 obtained by cutting out the drawing area 1306 from
312 is formed. The extraction of the drawing area 1306 may be performed in the same manner as described with reference to FIG. 9, or the vertical length of each line, the new upper margin, and the new line space 131 may be extracted.
Calculate the vertical length of the drawing area 1313 from the width of 0,
The horizontal length of the drawing area 1313 may be calculated from the horizontal length of each character 1306 in each line and the width of the new left margin and the new character interval 1310.

Image 1312 cut out in this way
Performs reduction processing in the same manner as the method shown in FIG. FIG.
, A reduction process may be performed after adding a new lower margin and a new right margin in addition to the new upper margin and the new left margin, or a new upper margin may be previously set as in the regions 902 and 908. Alternatively, the width of the new left margin may be set to “0”, a new margin may be provided on the screen at the reduction destination, and the reduction processing may be performed so as to match the area inside the margin.

FIG. 14 is an explanatory diagram of a drawing area extracting method in the image reduction processing shown in FIG. Here, first, a vertical drawing area of the original image 1401 shown in FIG. 14A is extracted. The extraction of the drawing area in the vertical direction is performed by sequentially checking the horizontal lines of the image data from the top. The content to be checked is whether there is a drawing dot in the line.

In this manner, the presence / absence of a drawing dot of each line is checked, and the line before the previous line has no drawing dot, but the line 14 has the drawing dot.
02 is detected (extracted) as the upper end of the first line. Next, when there is a drawing dot in the previous line, but there is no drawing dot in that line, the previous line 1
403 is detected as the lower end of the first row (FIG. 13B). Further, the upper and lower ends of the second and third rows are detected in the same manner. In this way, the upper and lower ends of each row (drawing area) 1404 are
Extract from 1. The hatched lines represent each row 1404,
These are the upper and lower ends of 1405 (FIG. 4D).

Next, for each row 1404, 1405,
Extract the drawing area in the horizontal direction. The method is shown in FIG.
As shown in (1), similar to the extraction in the vertical direction, this is performed by sequentially checking the presence or absence of drawing dots for each vertical line from the left. From this result, the left end line 1407 and the right end line 1408 of each character 1406 in each line 1404, 1405 are detected, and the drawing area 1406 of each character is completely extracted.

FIG. 15 is a flowchart of the vertical extraction process in the drawing area extraction shown in FIG.

In this process, when it is started (step 15)
01) First, the variable of “line number” is set to “0” to check from the top line, and the number of the line from which the drawing dot is to be extracted is set to “1”. ". Further, the flag “drawing flag” for storing whether or not there is a drawing dot in the previous line is set to “0”. (Step 1502). Then, the presence / absence of a drawing dot in the "line number" -th line is checked (step 1503). If there is a drawing dot in the line (step 1504), the state of the "drawing flag" is checked (step 1505). .

If the “drawing flag” is “0”, 1
Since there is no drawing dot on the previous line,
The value of “line number” is set to “top of drawing area” in the row of “line number to be extracted” (step 1506). Also, if there is a dot drawn in that line,
"1" is set in the "drawing flag" (150
7).

When there is no drawing dot in the line, the state of the "drawing flag" is checked (step 150).
8). If the “drawing flag” is “1”, there is a drawing dot in the previous line, so the “line number” is added to the “lower end of the drawing area” in the line of “line number to be extracted”. Is set to a value obtained by subtracting "1" from "1", and "1" is added to "row number to be extracted" to extract the next row (step 1509). If there is no drawing dot in that line, "0" is set in the "drawing flag" (step 1510).

Next, "1" is added to the variable of "line number" (step 1511), and the next line is checked. If the check is made up to the line at the lower end of the screen (step 1512), the process is terminated (step 1513).

FIG. 16 is a flowchart of the horizontal extraction process in the drawing area extraction shown in FIG. A portion 1617 surrounded by a dotted line is a process similar to the extraction process in the vertical direction. The range to be checked changes from full screen to line,
The extraction process is exactly the same except that the direction of checking changes from left to right from top to bottom, the direction of the line to check changes from horizontal to vertical, and the drawing area to be extracted changes from line to character The processing in the portion 1617 surrounded by the dotted line is performed for all the rows extracted in step (1).

In this process, when it is started (step 16)
01) First, “1” is set to “the number of the line to be checked” (step 1602), and then the processing included in the portion 1617 surrounded by the dotted line is performed.

Next, "1" is entered in "the number of the line to be checked".
(Step 1614), and the next line is checked. When the processing of the portion 1617 surrounded by the dotted line has been performed by the number of extracted rows (step 1615), the processing is terminated (step 1616).

In these embodiments, the reduced display processing of the extracted drawing area is performed. In the case of the enlarged display, the image data of the extracted drawing area is expanded and displayed. What should I do?

[0058]

According to the present invention, when an image including characters and figures is reduced or enlarged, a drawing area is extracted and reduced or enlarged with margins reduced, so that the image state is less crushed and easy to see. Can be sufficiently reduced or the drawing area can be sufficiently enlarged. Therefore, when the images are reduced and displayed in a list, it is easy for the user to select an image to be displayed or edited, and a necessary image (drawing area)
Can be sufficiently enlarged and displayed, and the operability is improved.

Also, such a function is: This can be realized without changing the hardware configuration of the device.

Further, according to the present invention, a drawing area can be detected simply and accurately, and a highly accurate reduced or enlarged image can be displayed.

Further, since a margin is set between adjacent reduced or enlarged images, it is possible to realize a display that is easy to see when a list is displayed after being reduced or enlarged.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a conventional image reduction processing method.

FIG. 2 is a block diagram of an image display device showing an embodiment of the present invention.

FIG. 3 is a flowchart of an image display process executed by the image display device of the present invention shown in FIG. 2;

FIG. 4 is an example of an image including characters and graphics.

FIG. 5 is another example of an image including characters and graphics.

FIG. 6 is still another example of an image including characters and graphics.

FIG. 7 is still another example of an image including characters and graphics.

FIG. 8 is an example in which images are displayed in a reduced list by a conventional method.

FIG. 9 is a diagram illustrating an example of an image reduction method in the image display device of the present invention.

FIG. 10 is a diagram illustrating a method of extracting a drawing area in the image reduction processing illustrated in FIG. 9;

11 is a flowchart of a vertical extraction process in the drawing area extraction process shown in FIG.

FIG. 12 is an example of displaying a reduced list of images by the reduced image display method in the image display device of the present invention.

FIG. 13 is a diagram showing another embodiment of the image reduction method provided in the image display device of the present invention.

14 is a diagram illustrating a drawing area extracting method in the image reduction processing illustrated in FIG.

15 is a vertical direction in the drawing area extraction shown in FIG. 14;
It is a flowchart of the extraction process of (line).

16 is a horizontal direction in the drawing area extraction shown in FIG.
6 is a flowchart of a (character) extraction method.

[Explanation of symbols]

 901 Original image 902 Drawing area 903 New margin 904 Cutout drawing area 905 Reduction destination area 906 Reduced image

Claims (6)

[Claims] 1. An image display device comprising: display means for displaying an image including characters and graphics; and image display control means for reducing or enlarging the image. The image display control means reduces or reduces an image. An image display device, wherein, when enlarging, an area in which characters or graphics are not actually drawn is reduced and then reduced or enlarged for the drawing area. 2. The image display control means detects a drawing area when reducing or enlarging an image. When a plurality of drawing areas are detected, at least one of the drawing areas is determined. 2. The image display device according to claim 1, wherein the image display device is moved to reduce a distance from another drawing area. 3. In the detection of the drawing area, it is checked in order from the top whether or not there is a drawing dot in each horizontal line of the image data, and the line where the drawing dot is found first is drawn. Processing to extract the vertical drawing area of the original image with the upper end of the area and the last line where the drawing dot is found as the lower end of the drawing area, and for each vertical line of the image data, whether there is a drawing dot in that line Check whether the drawing dot is found first as the left end of the drawing area and the line where the drawing dot is found last is taken as the right end of the drawing area, and extract the horizontal drawing area of the original image. 3. The image display device according to claim 2, further comprising: processing. 4. The image display apparatus according to claim 2, wherein said image display control means sets a margin between adjacent drawing areas when reducing the distance from another drawing area. 5. The image display device according to claim 4, wherein the margin is provided by uniformly setting a preset number of lines. 6. The image display device according to claim 4, wherein the margin is provided at a preset ratio with respect to the vertical or horizontal length of the extracted drawing area.