JPS61129693A - Computer image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a computer image display device called computer graphics, and particularly relates to a technique for selecting colors of an image.

[Conventional technology]

In computer graphics, a particular problem is how to color the screen. Particularly, for example, when a video signal from a VTR or video disc player is imported into memory and used as a still image, and an attempt is made to draw the same picture as this still image on a computer, conventionally, colors that can be used for display are prepared. A color palette as a means is fixedly defined in advance, and coloring is performed using the defined colors, for example, 16 colors.

Most of the conventional color graphic devices are
In many cases, all 16 colors used for this display are used.

In addition, it has been proposed that the color used to display this image can be selected from a large number of separately prepared colors, but in this case as well, all the selected colors are used for the display. There is. .

(Problem to be Solved by the Invention) When trying to apply colors that are as similar to the original image as possible to an image created by a computer as described above, it is better to use all the colors defined in the color palette. However, ,
If the user is drawing intentionally, it would be bad to use all colors. Therefore, it would be possible to specify the color of Ren Ci, but this would not allow the drawing to be as close to the original as possible.

[Means for solving problems]

In this invention, there is provided a memory (32) in which image data for one screen is stored, a microcomputer (1) to which image data read out from this memory (32) is transferred, and a microcomputer (1). another storage means (5) for storing image data created based on the image data;
Store it on lol! The memory (32 ) is transferred to the microcomputer (1), the image data from the memory (32) is converted to data for one color in the color palette, and the converted color is a prohibited color. Sometimes the N of the color palette
- Image data is created by converting into data of one of the n colors and stored in another storage means (group).

[Effect]

When a prohibited color is specified, excluding the prohibited n colors <N-
Color designation for image data from memory is automatically made using only n colors.

〔Example〕

Figure 2 is a diagram showing the overall outline of this invented device, (1)
is a microcomputer. This microcomputer (1) has a graphic function added to it, and a color palette board is attached via the 110 board, or it has a built-in color palette board, and in this example, you can choose from 4096 colors. You can choose from 16 different colors.

(2) is a video signal generation source such as a VTR or a video disk player, and the analog video signal from this source is supplied to a video processing circuit (3).

This video processing circuit (3) has a digitizer (31) that converts an input analog signal into a digital video signal, and a one-field memory (32) that has a capacity to store one field of the digital video signal. , is connected to the microcomputer (11) through a pass line.In addition, this video processing circuit II (31) receives the digital video signal from the digitizer (31) and the digital video signal created by this from the microcomputer (1). A switch (33) for switching between a digital video signal and a digital video signal in accordance with a command generated by a keyboard operation of the microcomputer (1), and a D/A converter (34) for converting the output of this switch (33) into an analog signal are provided.

Further, (4) is a monitor receiver to which a video signal from the D/A converter (34) of the video processing circuit (3) is supplied.

Furthermore, (5) is a floppy disk drive device, which is also connected to the pass line of the microcomputer (1), and the floppy disk is connected to the video RAM.
Work as.

In this device, a video signal source (2), for example V
The reproduced signal from the TR is supplied to a video processing circuit (3), and one pixel (hereinafter referred to as a pixel) is converted into 8-bit color data in a digitizer (31). In this case, this color data is red, green, and blue three primary color data R, G,
B, and as shown in Figure 5, for example, the red data R
is 3 bits D1 to D3, and green data G is D4 to D6.
The blue data B is represented by two bits Dv and Ds, respectively. Then, this digitized video signal is passed through a switch (33) to a D/A
The signal is supplied to a converter (34), converted back to the original analog video signal, and supplied to a monitor receiver (4), where the original reproduced color image is displayed on the monitor receiver (41).

The digital video signal from the digitizer (31) is also supplied to the input end of the l-field memory (32), and according to instructions from the microcomputer (1),
Among the original reproduced color images displayed on the monitor receiver (4), the signal of one screen at a predetermined point in time, that is, the video signal of one field in this case, is stored in the memory (3).
2).

Then, this captured one-field video signal is converted into 16-color image data determined by a color palette as described later by instructions from the microcomputer (1), and this is transferred to the floppy disk (5). Stored on disk (5).

The contents of Me%1J (32) are the contents of Micro Combiator (11
The image data is held until it is rewritten by the next command.

This image created by the microcomputer (1) is then sent to the switch (33) of the video processing circuit (3).
The original image processed by the digitizer (31) is displayed on the monitor receiver (4) via the digitizer (31).

Of course, the image created by the microcomputer (1) may be always displayed on another monitor receiver.

Here, the original image on the screen of the monitor receiver (4) based on the digital video signal created by the digitizer (31) is composed of 8 bits per pixel as shown in FIG. 448 pixels in direction, 2 in vertical direction
The image consists of 42 pixels. On the other hand, the image created by the microcomputer (1) is an image with 4 bits per pixel, 320 pixels in the horizontal direction and 200 pixels in the vertical direction, as shown in Figure 4.
31), it becomes a rough image compared to the original image.

In this case, as mentioned above, the microcomputer (1)
For example, select your favorite 16 colors from 4096 colors.
A function has been added that allows you to select and use colors, and this allows you to reproduce colors according to the ring image. In this example, the definition of the color barre, which consists of 16 colors used to create a color image, is automatically defined so that subtle colors can be reproduced, especially in the parts of the original image that you want to emphasize. It has been considered that it can be configured.

In other words, FIG. 6 and FIG. 7 are diagrams for explaining the method of defining this color palette, and FIG. 8 is a diagram for explaining the method of defining this color palette. This is a flowchart.How to define this color palette will be explained below with reference to FIGS. 6 to 8.

As shown in Figure 8, when this color palette definition program starts, the original image converted into a digital signal by the digitizer (31) is converted back to an analog signal and displayed on the screen of the monitor receiver (4). be done. As mentioned above, this is a finer image with a larger number of pixels than the computer-generated image (step (101)), as shown in FIG.

Next, on the original image of this monitor receiver (4),
The cursor (11) is displayed as shown in B and C (step (102) ”).The cursor (11) on this screen
) can be specified to any desired location by keyboard operation on the microcomputer (1). This is effectively equivalent to specifying a plurality of addresses in field memory (32) within the area enclosed by the cursor on the screen.

Therefore, the user uses the keyboard to move the cursor (11
) has been waiting for you. This is done in steps (103) and (104). That is, in step (103), it is determined whether there is a designation to move the cursor (11), and if the desired position is different from the current position of the cursor (11), the cursor (11) is moved.
The display coordinates of step 1) are changed in step (104), and if the position of the cursor (11) is not the desired position, the process proceeds to the next step (105).

In this step (105), the cursor (11)
The color data of each pixel of multiple pixels, for example 400 pixels, contained within the area surrounded by.

is read out from the memory (32), and the computer (
Incorporated into 11.

Once the 400 pixels of color data have been captured, the number of pixels in which the same color data appears is calculated (step (106)). In other words, the appearance frequency of each color is calculated. FIG. 7 diagrammatically shows the appearance frequency of each color information.

Then, this appearance frequency is cumulatively added to the appearance frequency of these colors up to that point (step (107)), and 16 target display colors are selected in order from the one with the highest cumulative number (step (107)). 10B)). In this case, the initial value of the appearance frequency is O, and the appearance frequency is sequentially accumulated each time the cursor (11) is moved and the specified area is changed.

Here, you can accumulate the appearance frequency for all 256 colors, or for a total of 32 colors (the 16 colors defined previously and the 16 colors defined this time) (actually less than 32 if there are duplicates) You may count the number of colors and choose 16 colors from the ones with the most.

If the user believes that it is still not possible to obtain a color image close to the original with the selected colors, the user operates the keyboard to further move the cursor (11) to a desired position. Then, in step (109), it is detected that the cursor (11) is designated to move, the display coordinates of the cursor (11) are changed again, and the cursor (11) is moved to the designated position. For example, move the cursor ((
11) is moved. And the step mentioned above (102
) to step (107) are executed, the cumulative number for each color is calculated again, and the 16 colors are reselected in descending order of the cumulative number.

In the case of Figure 6 A, B, and C, 16 colors were first selected focusing on hair color, then reselected focusing on skin color, and then 16 additional colors were selected by incorporating eye color. This is if it is fixed.

Note that the step "Is cursor movement specified?", which is similar to step (109), is performed in step (107):! :(
108), instead of selecting 16 colors at each position of the cursor (11), the frequency of each color is first determined based on color information from multiple areas to be emphasized, and from this. 16 colors can now be selected at once.

Once 16 colors have been selected, centering on the colors of the areas of emphasis, the 16 selected colors (8-bit data) are then applied to the 4096 colors (12 The corresponding one is selected from the 256 (8 bits) → 4096 (12 bits) conversion table from among the bit data (110
) ).

In other words, in the above steps, 25
First, 16 colors are selected from 6 colors, and those 16 colors are
The color is selected in correspondence with the closest color among the 4096 colors represented by 2 bits, and the 16 colors are defined as the color barre node. The defined 16 colors are stored on a floppy disk.

Once the color palette is defined in this way, the process moves to step (111) of creating a computer image.

In this step (111), first, the correspondence between the colors of the image in the memory (32) and the selected 16 colors is calculated.

In other words, Figure 1 is a diagram showing the correspondence of colors, and (100
) is data C1-C256 of possible 256 colors of the image color data from memory (32), and (200) is a color palette of 16 colors selected from 1 to [phase]. In this case, as shown by the solid arrow, for example, C
The 16 colors of the color palette are selected for the 256 colors, such as the color ■ for C1 to C16, the color ■ for C17 to C32, and so on. Then, colors from ■ to [phase] are selected for each dot of the image in the memory (32) using this conversion table.

When the selection of colors for all dots in the image in the memory (32) is completed, a command is executed to transfer the image in the memory (32) to the computer (1), and according to the conversion table, the image to be displayed by the computer (11) is Each pixel color is assigned 4 bits as one of the 16 colors, and this 4 bit data is written to the floppy disk.

Then, the switch (33) is changed by the keyboard operation of the computer (11).
The color image is displayed on the monitor receiver (4) as shown in the sixth diagram (step (112)).

Of course, at this time, the 4-bit color selection data is converted to 12-bit color data using the conversion table, and each dot is colored.

This projected computer image is then compared with the original image by switching the switch (33) by operating the keyboard of the computer (1), and if the selected colors are not satisfactory, the color palette is redefined. That is, step (101) to step (110)
are repeated, and the computer image is displayed on the monitor (41) through steps (111) and (112).Then, if a color that satisfies the user is selected, the flow of defining the color palette ends. becomes.

Among the 16 colors thus defined, if there is a color that the user does not want to use, that color is designated by the user. This is an image created by a computer (1) and a monitor receiver (4
), the 16 colors selected at the bottom of the monitor screen will be changed to A, B, C, etc.
It will be displayed along with the characters ``...'', so you can specify it by looking at it.

In this way, prohibited colors are specified, and for example, when the color marked ■ in Figure 1 is prohibited, the correspondence between the 15 colors in the color palette excluding the color marked ■ and the colors of the image in memory (32) is calculated anew. be done. That is, for example, as shown by the dashed arrow in FIG.
When all 16 colors of 0) are used, the possible colors C17 to C32 of the image from memory (32) associated with the color of the mapped to color. For example, C17 to C24 are associated with the color ■, C25 through C32 are associated with the color ■, and so on. Then, according to the conversion table associated in this way, for each dot of the image in memory (32),
One of the 15 colors on the color palette is selected.

Similarly, when the number of prohibited colors is 1 or more, n colors, 16-n colors of the color palette are used and memory (32)
The correspondence relationship between the 256 possible colors of the image is calculated and the conversion table is re-created.

In this way, users can simply specify the colors they do not want to use from the defined color palette and prohibit their use.
A computer image will be created without using that color. For example, if you want to use only warm colors out of the 16 colors in the selected color palette, you can prohibit all cool colors, and from among the warm colors,
The color closest to the original image color will be selected.

Therefore, a computer image with a color tone matching the user's preference can be easily obtained.

Note that in the above example, the N colors of the color palette are automatically selected based on the colors of the part of the original image that is desired to be emphasized, but in this invention, the N colors of the color palette are fixedly determined. Of course, the same applies to items that are manually selected.

〔Effect of the invention〕

As described above, according to the present invention, N of the color palette
If you specify n colors that are not used, the conversion table that converts the M colors of the original image to N (M>N) colors of the color palette will be regenerated into a conversion table that converts M colors to Nn colors. , N-n colors is created.

Therefore, it is possible to easily create an image made of warm colors, an image made of cool colors, etc. according to the user's preference.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the invention in detail, FIG. 2 is a diagram for explaining the overall outline of the invention, FIGS. 3 to 7 are diagrams for explaining the invention, and FIG. The figure is a flowchart of an example of a method for defining a color palette. (1) is a micro-combiner computer, (5) is a floppy disk drive as another storage means, and (32) is 1
This is field memory. Figure 5 Figure 6 Figure 7 Eup #Gongul (251j street)

Claims (1)

[Claims] A memory in which one screen worth of image data is stored, a microcomputer to which the image data read from this memory is transferred, and another to store image data created based on the image data in this microcomputer. storage means, a color palette means for defining a maximum of N colors used to create image data to be stored in the above-mentioned separate storage means, and n colors that are prohibited from being used among the N colors defined in this color palette means. when the image data from the memory is transferred to the microcomputer, the image data from the memory is converted to data of one color from the color palette, and the conversion If the prohibited color is one of the prohibited colors, one of the N−n colors in the color palette.
A computer image display device in which image data is created by being converted into color data and stored in the separate storage means.