JPS6068471A - Video display device - Google Patents

Abstract

PURPOSE:To perform a complete change of colors for a complicated shape of a closed area and to reduce the memory capacity by continuing the change of colors with an address where the color information of a memory on the addresses adjacent to each other in the secondary scanning direction of the address of a picture memory for each change of said address. CONSTITUTION:The raster on a CRT2 of a video display device is detected by a light pen 1, and the coordinates of the raster are decided by a coordinate deciding circuit 3. A command generating circuit 5 converts the coordinates into a command of a control circuit 6 with outputs of the circuit 3 and a keyboard 4. At the same time, a counter 7 counts clocks and a selector 9 selects addresses xa and ya in a display period and outputs xb and yb of the circuit 6 in a non- display period respectively to give an access to a picture memory 10. While the contents of the memory 10 are compared with the contents of the 1st and 2nd color information registers 14 and 15 by the 1st and 2nd comparators 16 and 17 respectively. Then a changing point detecting circuit 18 detects a point where the color of the address of the memory 10 is different from that of another point preceding by one position. Thus a complete color change is possible which a closed area of a complicated shape.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention is a digital image memo! The present invention relates to a video display device that displays a pattern according to color image information incorporated by JIC.

(B) Prior art In general, a coordinate string is used with the horizontal scanning direction of a video display tube (hereinafter abbreviated as CRT) being the X axis and the vertical scanning direction being the Y axis, and the CRT is instructed with the light ben λ or the coordinates are input using a keyboard, etc. There is a video display device that records color information at an address in an image memory relative to the designated coordinates and displays the contents of the image memory on the CRT. In a prayer video display device, when changing the color information in a closed @ area to other color information, that is, blocking a closed area, it is fine if it is a simple closed area as shown in Figure 1, but it is fine if it is a simple closed area as shown in Figure 2. It was not possible to completely fill in complex closed areas such as . Also, if you change the color sequentially from the designated point ゝ0'' in the order of ゝX1ゝゝゝ2ゝ... on the top, bottom, left and right as shown in Figure 3, it is impossible to completely fill in even a complex closed area. Although this is possible, it has the drawback that it requires a huge amount of memory to record the coordinates.

(/→ Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide an image display device that can fill in even a complex closed area without using a large capacity memory. It is an object.

B) Structure of the Invention The present invention provides a method for sequentially changing colors while changing an address in the image memory, and when that address is changed, the color information in the image memory for two addresses adjacent to that address in the sub-scanning direction changes. The color change is continued using the address or an address determined by the address as the color change start address.

(E) Embodiment FIG. 4 shows a block diagram of the internal configuration of the video display device of the present invention.

In the figure, (1) is a light ben, and the ben (11tC
By pressing on the RT+21 screen, Light Ben (1
) detects the raster, the coordinate determining circuit (3) determines the coordinates where the light ben (]) is pressed. (4) is a keyboard; the keyboard (4) and the coordinate determination circuit (3)
The output from the control circuit (
6) is converted into the command executed. (7) is a counter for scanning the display;
1. It counts the clock pulses from the source (8) and outputs the address (Xa, Ya) to the selector (9). During the selector t91Vi display period, the output (Xa
, Ya), and the output (xb, yb) of the control circuit (6) is output during the non-display period. This is to eliminate display disturbances caused by the control circuit (7) accessing the image memory (IO) during the display period. Memo this image! +
+101 is composed of a RAM, and if there are 8 types of color information, each of R, G, and B has a capacity for the planning surface. In other words, if the number of pixels is 512 x 512, the capacity of image memory II (101) is 512 x 512 x 3 (
bit). (The image memory (lO) is set to read mode during the display period, and the control circuit (6) is set to the read mode during the non-display period.
This is a port that selects the output of the output and puts it into read or write mode. The image information read from the image memory (10) is converted into a serial signal by the parallel-to-serial conversion circuit α'4, υ, D/A.
It is displayed on a CRT (21) via a conversion circuit (03).(1
41 is the first color information, for example, a red register, and θXun is the second color information.
Color information, for example, the address of the location where each color is displayed as fresh water in the blue register is introduced. Q6) is this first
Color information register (141 contents and image memo!J (1
07) is a first comparison circuit that compares the contents of 01 with the contents of the image memory (lO); 07) is a second comparison circuit that compares the contents of the second color information register θ with the contents of the image memory (lO); A color change detection circuit (IC4 is a control circuit (6
) K is directly connected data RAM.

FIG. 5 is a display screen diagram showing the order of color changes in the video display device of the present invention shown in FIG. The case of changing the first color information (indicated by diagonal lines), for example, red, to the second color information (blue) will be described with reference to FIG. 5.

When arbitrary coordinates within a closed region are given, a starting point is first determined. In the embodiment, for example, when the coordinates of point 20 are given, the top left end of the area is set as the starting point. As shown in the figure, the colors are changed sequentially starting from 1. At this time, each time the address is changed, the color information of the upper and lower addresses (Y+1. and Y-1) is read and the point where the color information has changed is determined. ,
and whether it is Y+1 or Y-1 is stored. Fifth
In the case of the figure, 26(-1)100(+1)104<
+1)255(+1)258(+1).

When the color change is completed to the end (up to 294), the next stored address is read out, and if it is +1, the read address is incremented by Y+1, and if it is -1, it is incremented by Y-1, and the color of that address has not been changed yet. Otherwise, the memorized +1 and -1
Change the color accordingly. In the figure, 295-3
48.349-355.356-403. This is an area whose color has been changed based on the address stored in the area. Also at this time, Y+1. Determine the color information of the Y-1 address and find the change point (
In the figure, 363) processing is performed.

Next, the hardware operation of such color change will be explained with reference to FIG. Now, if the color of the closed area is red and you want to change it to blue, the control circuit (6) first determines the starting point and sends the address (X) to the selector (9) during the non-display period.
b, Yb), put the gate (1) in write mode,
Change the start address to blue register θ. Next, add 1 to the X address and proceed to the next address. New (X
b, Yb) and by setting the gate (1) to read mode, the content of the (xb, yb) address of the image memo!
), and if they do not match, the contents of the blue register 05) are written to that address. At that time, Y+1. Y
If the color information content of the -1 address is different from the one address before, the color change point detection circuit 01 outputs a change point detection signal to the control circuit (pupil), and the control circuit (6) detects the address and direction (+1 or -1) is written and stored in the RAM (191).Continuing this operation, when the X direction is completed, it is Y.Next, read the stored address from RAM <191, and if it is +1, it is Y+1, and if it is -1, it is I'. J:, Y-1
1,? The contents of the image memory (10) for the c address are read out and the contents of the blue register (+5) and the second comparison circuit 0 are read.
7), and if they match, it is determined that the color has already been changed, and the next stored address is read. If they do not match, use that point as the start address, change the X direction sequentially, then change the color, and still change the Y address to 2. Memorized +1, -1
Change according to the following and continue working. However, in this case as well, it is necessary to detect the point of change in the color information of the Y+1 and Y-1 addresses for each address.

In this way, when the color change is completed for all memory addresses in the RAM Q9), the filling in of the closed area is completed.

In the detailed description of the present invention, the horizontal scanning direction is referred to as main scanning and the vertical scanning direction is referred to as sub-scanning, but the same is basically the same even if the directions are reversed.

FIG. 6 shows an operational flowchart for the configuration shown in FIG. 4 for reference.

(F) Effects of the Invention As is clear from the above description, the present invention provides an address in which the color information of the image memory for two addresses adjacent to the address in the sub-scanning direction changes each time the address is changed, or Since the color change is continued using the fixed address as the color change start address, it is possible to completely change the color even in a closed area with a complicated shape, and the process can be performed with a small memory capacity.

[Brief explanation of the drawing]

Figures 1, 2, and 3/l'i Display screen diagrams showing display examples of people figures; Figure 4 is a block diagram showing the internal configuration of the bag of the present invention, Figure 5; FIG. 6 is an operation flowchart of the present invention, in which (2) is a CRT, (6) is a control circuit, (101 is an image memory, Q41051 is a color information register, and Q119 (+7
) I'i comparison circuit and Q8) indicate a color change point detection circuit, respectively.

Claims (1)

[Claims] D) In a video display device that can change a closed area composed of the same color information to the color information forming the closed area when displaying a pattern according to the color image information written in the digital μ image memory. , color video display tube (CRT)
, an image memory for storing a color image to be displayed on the CRT, a color information register for storing at least color information to be changed and color information to be changed, and the contents of each register and the image memory. and a color change detection circuit that detects a change in the color information content of the address of the image mail, and the horizontal scanning direction (vertical scanning direction) of the CRT is set as the main scanning direction. Vertical scanning direction (
When changing the color sequentially while changing the address of the image memory (horizontal scanning direction) as sub-scanning, each time the address is changed, the color of the image memory for two addresses adjacent to the address in the sub-scanning direction is changed. A video display device characterized in that color change is continued using an address where information has changed or an address determined from the address as a color change start address.