JPS5872990A - Color graphic generation system - 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 Conventionally, in a color graphic display device,
The color generation system is equipped with image memories corresponding to each of the three primary colors, red, green, and blue, and in order to express the shading of each color, multiple images are created for each of the above colors. There was a way to prepare memory. Another method involves storing a color code in image memory, and adding this color code as an address to a memory called a look-up table or color map before converting it to a video signal.
Three primary colors with arbitrary levels were stored in the lookup table, and a color corresponding to the capacity was generated.

On the other hand, a display method is generally used in which a plurality of sets of figures are stored in different image memories, and the figures are simultaneously displayed in a superimposed manner, or only a specific figure is selectively displayed.

In these methods, as long as the color generation method described above is used, red, green, and blue image memories or color-coded image memories must be used for each display set.

If there is +Ilg information in color, the number of image memories increases, resulting in an enormous memory capacity.

Therefore, there is a method of reducing the number of image memories by having multiple sets of memories for storing graphic information (luminance information) and one set of memories for storing color information, and displaying by sharing the color memory.

In the above method, the brightness is set at two levels (ON, OFP, F
), a predetermined color can be generated by ANDing the brightness information and color information, but if there are multiple levels of brightness and color information, then the color information? Configuring @tan with an AND gate circuit is complicated, leading to an increase in cost.

The present invention provides a memory for selecting M classes of colors according to the color information and selecting shading corresponding to each brightness according to the luminance information, in accordance with the color gradation generation method when there are multiple levels of luminance and color information. It is characterized by being able to express any color by providing a combinational circuit made up of, etc.

This is because in conventional look-up table data processing, only one color number is stored in the image memory, and the look-up table stores the types of colors including ima at the address in random order. Unlike the reading method, the data array in the lookup table is classified into color type and shade information, and the color type is determined by a set of image memories and a? rM is another simultaneous plurality or one
This method allows access to a set of luminance memories and expresses any color. This allows multicolor expression with a small amount of memory.

The present invention will be explained in detail below.

FIG. 1 shows the structure of an image memory according to the present invention, in which image memories 1 and 2, which are 1' memories that store luminance information, are stored in pixels (pixels indicating one point) corresponding to the display position of a figure. , a second image memory 3 storing color information is shown. In FIG. 1, image memories 1 and 2 each consist of two planes la, lb, and 2a+2b (size corresponding to one screen).
Each of them has four levels of brightness. The number of planes may be any number.

On the other hand, the image memory 3 that stores color information has three planes (3a to 3c) in the illustrated example, and can express seven colors.

The outputs of each silk 1 and 2 for brightness information are ORed by an OR gate 4, and by displaying two power supplies at the same time or by prohibiting the output of one set, only one selected set is displayed. be able to. The output of the OR gate 4 is added to the address of the third memory 5, and at the same time, this memory receives each output signal of the image memory 3 for color information as an address.

The output signals of the image memories 1 to 3 are sequentially read out in series in synchronization with the horizontal and vertical synchronizing signals of the monitor. That is, the address signal of the memory 5 is pixel information at the same position in each image memory.

In the memory 5, color information is given to upper addresses P1 to P3, and brightness information is given to lower addresses P4 and P5. The order may be either higher or lower.

FIG. 2 shows the contents of the memory 5 according to the present invention. The output of memory 5 appears as the color primaries red, green and blue.

The colors specified by the color information are shown in Figure 2.
Red, green and blue are respectively J, L and P+Q+
It is given in R. J, N, l, and P, QIR are values indicating the shading level of each of the three primary colors, so a tone is specified for every four addresses in the memory, and two for the other addresses.
The brightness of 1/3 is indicated by ↑9. The signal for selecting color tone is the output signal of image memory 3 for color information, and the signal for selecting brightness is the output signal of image memories 1 and 2 for brightness.

By arranging each primary color in the memory 5 as shown in FIG. 2, brightness proportional to luminance information can be obtained.

In FIG. 2, Lk and lVi are written at address positions when there is no brightness or level, and a predetermined color is output. A color generated from a single image without brightness is generally called a background color, and any color can be set.

As described above, in order to divide the color information and brightness information and write them into the uniform memory, and use a plurality of combinations of information, the color memory 5 is provided, and the color information is recorded in the arrangement shown in FIG.・Shun.

With this method, many different figures can be expressed for each image memory using one set of color memories for a plurality of memories containing luminance information.

This configuration reduces the cost of color memory and is effective when performing brightness modulation for the purpose of line smoothing or when switching between two or more sets of image memories for dynamic graphic display. .

[Brief explanation of the drawing]

FIG. 1 shows an image memory structure according to the invention;
The figure shows the memory contents. 1. Image memory for brightness information i a, 1 b Image memory plane for brightness information 2, Image memory for brightness information 2a+2b Image memory plane for brightness information 3, Image memory for color information 3 at 3 bl 3 c Image memory for color information Plane 4, OR gate 5, 1 person for memory patent Tsuneo Iketo, Representative Director of Saira Tsuku Co., Ltd.

Claims (1)

[Claims] A color display device having a first image memory consisting of a plurality of sets for storing luminance information and a second image memory consisting of at least one set for storing color information, and outputting information from each of the image memories, It is a smart idea to add the color tone and brightness information as an address to the third memory, and to display in multicolor any one set or multiple sets of figures stored in the plurality of sets of brightness image memories at the same time. The main color figure generation method.