JPS61128329A - Computer image display device - Google Patents

Abstract

PURPOSE:To define a color pallet so that a color on a part to be emphasized in an original image becomes the center and to obtain a computer image faithful to the original image by specifying a partial area of a video signal read out from a memory displayed on a monitor image receiver. CONSTITUTION:An analog video signal outputted from a video signal source 2 is converted into a digital signal by a digitizer 31 in a video processing circuit 3, its one field part is stored in an one-field memory 32 and its read-out still image is displayed on a monitor image receiver 4. An output read out from the memory 32 is transmitted to a microcomputer 1, which forms a color image corresponding to the still image read out from the memory 32. The formed color image is displayed on an image receiver 4 by turning a switch 33. A partial area of the video signal displayed on the image receiver 4 is specified by an area specifying means 11 to define the color pallet so that a part to be emphasized in the original image becomes the center.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] - The present invention relates to a computer image display device called combiator graphics, and in particular to its I! This invention relates to a technique for selecting the color of an Ii image.

[Conventional technology]

In computer graphics, a particular problem is how to color the screen. In particular, for example, when capturing a video signal from a VTR or video disc player into memory and making it a still image, and trying to draw the same picture as this still image on a computer, conventionally, the colors that can be used for display are As a means of preparing! In most conventional color graphic devices, the 16 colors used for display are fixed, and coloring is performed using the defined colors, for example, 16 colors. There are many things that are done.

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. I used to look at the original picture and set the colors to be used for displaying it.

[Problem that the invention seeks to solve]

As mentioned above, when trying to give an image created by a computer a color that is almost the same as the original image, it is difficult to obtain color reproducibility just by using 16 fixed, pre-prepared colors.

On the other hand, according to the method in which the user selects and specifies 16 colors, an image with colors relatively close to the original can be obtained by redefining the color palette several times.
The disadvantage is that it takes a lot of time and effort to define a color palette consisting of six colors.

[Means for solving problems]

In this invention, a digitizer (31) that converts analog video signal information into a digital signal, a memory (32) that stores an arbitrary screen worth of digital video signal from this digitizer (31), and this memory (32) ) displays the still image read out from the monitor receiver (6).
) and a microcomputer (1) to which the readout output of the memory (32) is transferred, and the microcomputer (1) creates a color image corresponding to the still image stored in the memory (32). In a device that displays the displayed image on a monitor receiver,
Means (11) for specifying a partial area of a screen of a digital video signal read out from a memory (32) displayed on a monitor receiver (6), and a valley corresponding to the specified area.

means for calculating the frequency of appearance of each color for a plurality of pixels;
When the specified area is a plurality of areas, means for accumulating the appearance frequency of each color in each area, and a microcomputer (1) based on the accumulated appearance frequency.
N used to display the color image created by
A means for specifying a color is provided.

[Effect]

A means (11) for specifying a part of the screen to specify a part of the screen to be emphasized, and a means (11) for specifying the appearance frequency of each color information in this part of the area.
When a plurality of areas are designated by , they are cumulatively counted and N colors of the color palette are automatically defined in order from the one with the highest cumulative frequency.

〔Example〕

Figure 2 is a diagram showing the overall outline of this invention 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 has a built-in color palette board, allowing you to choose 16 colors from 4096 colors. You can select and use it.

(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.The video processing circuit (3) also receives a digital video signal from the digitizer (31) and a digital video signal from the microcomputer (1). A switch (33) for switching between a digital video signal and a digital video signal by a command generated by keyboard operation of the microcomputer (1), and a D/A converter (34) for converting the output of this switch (33) back to an analog signal are provided.

Also, (4)! Yo, video processing circuit (3) D/
This is a monitor receiver to which the video signal from the A' converter (34) is supplied.

Furthermore, (5) is a floppy disk dry 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 playback signal from the TR is supplied to a video processing circuit (3), where the digitizer (31) converts the first pixel (hereinafter referred to as a pixel) into an 8-bit signal, which is then sent to the D/A through a switch (33). The signal is supplied to the converter (34), converted back to analog signal, and sent to the monitor receiver (4).
The original image of the reproduced color image is displayed on this monitor receiver (4).

The output signal of the digitizer (31) is also supplied to the input terminal of the l-field memory (32), and is sent to the monitor receiver (4) according to instructions from the microcomputer (+1).
), the signal of one screen at a predetermined time point, that is, the video signal of 1 field in this case, is written into the memory (32).

The captured video signal of one field is determined by a color palette created as described above based on instructions from the microcomputer (1).
It is converted into six color image data, transferred to a floppy disk (5), and stored on this disk (5).

The contents of memory (32) are microcomputer (1)
The image data is held until it is rewritten by the next command.

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

Note that the image created by the microcomputer ti+ may of course 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 (3″1) is
As shown in Figure 3, one pixel (pixel) is composed of 8-bit data, and the horizontal direction of the screen is 448 pixels.
This results in an image with 242 pixels in the vertical direction. On the other hand, in the image created by the micro-architecture (1), 1 pixel has 4 bits and the horizontal direction is 32 bits, as shown in Figure 4.
The resulting image has 0 pixels and 200 pixels in the vertical direction, which is roughly equivalent to the original image produced by the digitizer (31).

In this case, as mentioned above, the microcomputer (1)
For example, select your favorite color from 4096 colors □.
A function has been added that allows you to select and use six colors, and one of these is the ability to reproduce colors that match the original image. In addition, this invention automatically sets the definition of a color palette consisting of 16 colors used to create a color image so that delicate colors can be reproduced, centering on the colors of the parts of the original image that are particularly important. It is considered possible to do so.

That is, FIG. 1 is a diagram for explaining the method of defining this color palette, and FIG. 7 is a diagram showing a microcomputer (1) for defining this color palette.
This is a flowchart. How to define this color palette will be explained below with reference to FIGS. 1 and 7 as well as FIGS. 5 and 6.

As shown in Figure 7, when this color palette definition program starts, the original image converted into a digital signal by the digitalizer (31) is converted back to an analog signal on the screen of the monitor receiver (4). will be displayed. As mentioned above, as shown in FIG. 3, this is a finer image with a larger number of pixels than the computer-generated image (step (101)).

Next, on the original image of this monitor receiver (4),
As shown in B and C, the cursor (11) is displayed (step (102)).
) can be specified to any desired location by keyboard operation in the microcomputer (13).This is actually a double address in the area surrounded by the cursor on the screen among the addresses in the field memory (32). Equivalent to specifying

Therefore, the user uses the keyboard to move the cursor (1
1) is coming. 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 a plurality of pixels, for example, 400 pixels, included in the area surrounded by is stored. In this case, this color data is the three primary color data R of red, edge and blue.
. Bit data D4 to Drh and blue data B are represented by two bits I>T, Ds.

, when this 400-pixel color data is written into the memory, 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. 6 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 largest cumulative number (step (107)). 108) ). In this case, the initial value of the appearance frequency is 0, and each time the cursor (11) is moved and the specified area is changed, the hot water appearance frequency is sequentially accumulated.

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 also choose 16 colors from the ones that come true.

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 movement of the cursor (11) is specified, and the display coordinates of the cursor (11) are changed again, and the cursor (11) is moved to the specified position. From the position of the hair, 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 1 A, B, and C, first, focus on the color of the hair.
This is a case where 6 colors are selected, then reselected focusing on skin color, and then 16 colors are further reselected by incorporating eye color.

Note that the step "Cursor movement specified?", which is similar to step (109), is performed in steps (107) and (10B).
), 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 that you want to focus on, and from this point the frequency of each color is determined at once. There are now 16 colors to choose from.

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 (12 256 (8 bits) → 4096 (12 bits) data is selected according to the conversion table, and a color palette is defined (step (110 bits)).
)).

In other words, in the above steps, 25
First, 16 colors are selected from 6 colors, and those 16 colors are
Among the 4096 colors represented by 2 bits, the 121st color is selected in correspondence with the color of the object, and these 16 colors are defined as a color palette. This defined 1
The six 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, and once the selection of the corresponding colors is completed, the image in the memory (32) is transferred to the computer (1). The transfer command is executed, and according to the conversion table, the color of each pixel of the image to be displayed by the computer (1) is assigned as one of the 16 colors with 4 bits, and this 4-bit data is transferred to the floppy disk. will be written to.

Then, the switch (33) is changed by operating the keyboard of the computer (1), and the computer (1)
A color image is displayed on the monitor receiver (4) as shown in the first 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 combiator 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 color is not satisfactory, the color palette is redefined. That is, step (101) to step (110)
is repeated, and the computer image is displayed on the monitor t11 (4) through steps [111] and (112).Once the user has selected a color that satisfies him, the flow for defining the color palette is as follows: It ends.

〔Effect of the invention〕

As described above, according to the present invention, when obtaining an image with colors similar to the original image, it is possible to define a color palette centered on the colors of the parts of the original image that are desired to be emphasized. A more faithful combiator image can be easily obtained.

Furthermore, the color palette is defined simply by specifying the part of the image to be emphasized with a cursor, rather than being selected by the user one by one, which has the advantage that the color palette can be defined very easily.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the outline of the main parts of this invention, FIG. 2 is a diagram showing the outline configuration of the apparatus of this invention, FIGS. 3 and 4 are diagrams showing the configuration of a color image, FIG. 5 is a diagram for explaining color information of one pixel, FIG. 6 is a diagram used for explaining color selection, and FIG. 7 is a diagram showing an example of a flowchart for defining a color palette according to the present invention. (1) is a microcomputer, (31) is a digitizer, (32) is one field memory, (4 is a monitor receiver. Figure 1 Figure 5 Figure 6

Claims (1)

[Claims] A digitizer that converts analog video signal information into a digital signal, a memory that stores one screen of the digital video signal from the digitizer, and a monitor receiver that displays a still image read from the memory. It has a microcomputer to which the readout output of the memory is transferred, and the microcomputer creates a color image corresponding to the still image stored in the memory, and displays the created image on a monitor receiver. means for specifying a partial area of a screen of a digital video signal read from the memory displayed on the monitor receiver, and means for specifying each color for a plurality of pixels included in the specified area; means for counting the appearance frequency; when the specified area is a plurality of areas, means for accumulating the appearance frequency of each color in each of the areas; and creation by the microcomputer based on the accumulated appearance frequency. and means for specifying N colors to be used for displaying a color image.