JPH0248911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for rapidly displaying a simulation image of the appearance of a colored object having shades arranged in accordance with a design pattern.

When manufacturing products that are finished by painting, dyeing, or combining colored materials, there are many combinations of pattern designs and colors given to the patterns. for example,
The design is a combination of three color patterns, with 15 colors available for each pattern.
If colors exist, the product will have 3 ¹⁵ = 14348907 combinations of color patterns. Even if all of these color patterns could be easily manufactured by combining them according to orders, it would normally be impossible to prepare so many samples. Therefore,
There is a need for a device that can simulate the results of arbitrary combinations. If the design pattern does not have two-dimensional shading, a simulation device can be configured using a conventional image display device having a pseudo color display function. This will be explained with reference to FIGS. 1 and 2. The digital image memory 1 stores a design pattern, and represents an image using, for example, 512×512 pixels.

FIG. 2a is an example of this, and is a design pattern in which the entire screen is divided into three color areas. Pixels in each region have 1, 2 or 3 color codes. Numerals 2, 3, and 4 in FIG. 1 are pseudocolor conversion memories, each address of which is accessed by a color code, and the color of that area is determined by the three primary color values stored at that address. That is, the image memory 1 is read out in synchronization with the scanning of the display monitor 8, such as a color CRT, and the color code is accessed to the pseudo color conversion memories 2, 3, and 4. memory 2
is the value R of the primary color “red” corresponding to that color code.The memory 3 also outputs the “green” value G, and the memory 4 also outputs the “blue” value B. , 7 into an analog voltage,
It is added to a color CRT to display images. The colors displayed at this time are the colors specified by R, G, and B stored in the addresses of the pseudo color conversion memories 2, 3, and 4 indicated by the color codes in each area. If red, yellow, and gray are assigned to codes 1, 2, and 3, respectively, Figure 2b shows the display result of Y, and green,
If blue and white are given, Figure 2c shows the display result of Y. Such a color change is performed by a control device 9 such as an electronic computer in a pseudo color conversion memory 2,
This can be executed by rewriting the contents of 3 and 4.

However, actually manufactured products are generally three-dimensional, and when simulating the actual appearance of the product, it is necessary to correctly display shadows and the like caused by the lighting conditions. Therefore, with conventional devices, it is not possible to perform high-speed simulation of changing the color of a color image with shadows, and the simulation image is created by rewriting the refresh memory, which has three primary color values of R, G, and B for each pixel, while performing calculations. was displayed.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide an apparatus that can quickly simulate and display a design pattern, including shading, while changing the color of each area.

Next, the present invention will be explained in detail using the drawings.

FIG. 3 is a block diagram showing a first embodiment of the simulation image display device 100 of the present invention. The first digital image memory 1 stores a design pattern and stores a color code for each pixel. The second digital image memory 10 also stores image shading information, in which the brightness (ie, shading) of each pixel is set depending on the degree of reflection of illumination. The color shading conversion memory group 20 includes k sets (k is a positive integer) of color shading conversion memories, and each set is connected to a display monitor 8 such as a color CRT.
It consists of three conversion memories 21, 22, and 23 corresponding to the three primary color values. The digital image memories 10 of the first digital image memories 1 and 2 are read out in synchronization with the scanning of the display monitor 8, and the color code provided by the former addresses the set of color and shade conversion memories and the color code provided by the latter is read out in synchronization with the scanning of the display monitor 8. The shaded value addressed addresses that shaded transformation memory. That is,
For each pixel, the color indicated by the color code of the design pattern to which the pixel belongs is obtained from the color conversion memory group 20 as three primary color values with shading corresponding to the pixel position, and the D/A converters 5 and 6 ,7 is given. The signal is converted into an analog value, and a simulation image is displayed on the display monitor 8. The three primary color values for the shade of color represented by each color code are calculated in advance by a control device 9 such as an electronic computer, and are stored in the conversion memories 21, 22, 23.
Since the number of sets of conversion memories can be changed by loading them into the first digital image memory, it is sufficient to prepare only the maximum number of colors used in one stroke of the design pattern that can be held in the first digital image memory.

A second embodiment of the present invention will be described with reference to FIG. Here, unlike the example of FIG. 3, each set of color shading conversion memories 20 is commonly addressed with each shading value by the scanned output of the second digital image memory 10, and the shading values of all sets correspond to that shading value. Three primary color values are output. These values are input to three multiplexers 31, 32, 33 for each primary color.
The simulation image is multiplexer 31, 3
2 and 33 select a signal corresponding to the color code given by the first digital image memory 1 from these three primary color signals and send it to the display monitor 8 via the D/A converters 5, 6 and 7. Displayed by
The contents of the conversion memories 21, 22, 23 are stored in the control device 9.
As in the case of the first embodiment, the correspondence between the color code of the design pattern and the color can be quickly changed and simulated by the conversion.

An example of the use of the present invention will be described below using image examples. Figure 5 is an example of a design pattern of a cylindrical object painted in three colors in front of the background.
The images are stored in the digital image memory 1 of . The color code of each area of numbers (1 to 4) in the figure is shown. FIG. 6 shows shadow image information, which is stored in the second digital image memory 10. Such an image is created by making a sample of the cylindrical object to be designed and all surfaces of the background using, for example, a white material, actually lighting it, capturing the scene with a television camera, and converting it into 6-bit values. Obtained by digitizing. In this example, there are four color codes, so the color conversion memory group 20 in FIG. 3 or 4 has a minimum of four sets of color and shade conversion memories. The control device 9 assigns blue-purple-red, yellow, and green to codes 1 to 4, respectively, and the values shown in FIG. 7 are loaded as the three primary color values (R, G, B) of each conversion memory set. As shown in Fig. 8, the simulation image displayed by the present invention is such that a cylinder with each region painted in red, yellow, and green is shaded by illumination in front of a bluish-purple background, and the background is It becomes a natural scene that casts a shadow. For such a design, if there are, for example, 15 colors that can be used, the values shown in FIG. By repeatedly reloading memory values, scenes of multiple color combinations can be simulated without producing swatches. As mentioned above, changing the color, including the shading of each area, can be performed using only the contents of a relatively small color shading conversion memory without rewriting the contents of a large capacity image memory, resulting in extremely fast simulation images. A display device can be configured.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a conventional image display device that can simulate a design pattern without shading, FIG. 2 is an explanatory diagram of the operation of the conventional device, and FIG. FIG. 4 is a block diagram showing the second embodiment of the present invention, and FIGS. 5, 6, 7, and 8 are explanatory diagrams of the operation of the present invention. be. In the figure, 1 is a first digital image memory, 2 to 4 are pseudo color conversion memories, 5 to 7 are D/A converters, 8 is a display monitor, 9 is a control device,
10 is a second digital image memory, 20 is a color conversion memory group, 21 to 23 are color and shade conversion memories, 31 to 33 are multiplexers, and 100 is a simulation image display device of the present invention.

Claims (1)

[Scope of Claims] 1. A first digital image memory that stores a color code of a region in each pixel of an image of a design pattern, and a second digital image memory that also stores a shading value in each pixel. and k sets (k is a positive integer) of color and shading conversion memories, one of which is selected by the output of the first digital image memory, and the contents of the selected color and shading conversion memory are transferred to the second digital image memory. a color shading conversion memory group accessed by the output of the image memory; a D/A converter that inputs the three primary color values output from the color shading conversion memory group and converts them into analog signals; and a D/A converter from the D/A converter. A simulation image display device that rapidly displays a simulation image of a design pattern with shading, and a display monitor that displays a color image using an analog signal. 2. A first digital image memory that stores the color code of the region in each pixel of the image of the design pattern, a second digital image memory that also stores the shading value in each pixel, and k sets (k k is a positive integer), all of which are simultaneously accessed by the output of said second digital image memory, and the output of said color shading transformation memory group k
a multiplexer for selecting a set of three primary color values from the set of three primary color values by the output of the first digital image memory;
A simulation image display device that is composed of an A converter and a display monitor that displays a color image using an analog signal from the D/A converter, and that displays a simulation image of a design pattern with shading at high speed.