JPS62256181A - Picture processor - Google Patents

Abstract

PURPOSE:To obtain a natural block color picture by deciding the color for coloring the block by using the histogram of the color and coloring. CONSTITUTION:A color information table forming circuit 2 reads the contents of a picture memory for the block unit and processes. Since the picture memory 1 cannot read color data in the direction of a depth with respect to a specific picture element at the same time in case of reading the picture data of the block for the reason why four layers of R, G, B, Y are present in the direction of the depth, it forms a color information table so as to operate the color data of the picture element at the same time. The color data of the color information table formed by the color information table forming circuit 2 is read for the picture element by a color information reading circuit 3 and outputted to a color information identification circuit 4. In the color information identification circuit 4, a picture element color is discriminated based on the values of R, G, B, Y outputted at every picture element and one color of 16 colors represented by 4 bits of R, G, B, Y is selected. In a color distribution detecting circuit 6, the value counted for the color in the same color counting circuit 5 is received, the histogram of the color used in the block is detected, and the block is colored by the use of the color high in the histogram.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing device that divides image information colored for each pixel into blocks and determines the color to be colored in each block based on the frequency distribution of colors in each block. It is something.

BACKGROUND OF THE INVENTION As shown in FIG. 5, a conventional image processing system processes image information input from a console 12 using a control program in a memory 13, stores it in an image memory 1 as color information, and displays it on a display device 11. was.

Additionally, when creating a screen colored in blocks, a sampling method was used. As shown in Figure 6, the sampling method is to sample the contents of the image memory colored for each pixel in a grid pattern using the block size values in both the vertical and horizontal directions so that one sample point is taken within each block. Coloring is performed for each block using the color data of the pixels of the sample points as the block color. In this way, all the contents of the image memory are colored block by block.

Problems to be Solved by the Invention In this sampling method, each sample point is discrete, and the frequency distribution of colors within the block is not considered.
If the pixel selected as a sample point is unique, the inside of the block is colored with the selected pixel color.

Therefore, images created using the sampling method may give a strange impression.

The present invention detects the color distribution within the block as a method of coloring the inside of the block, and uses the frequency distribution of the detected color to
Outputs the blocks in order of color starting from the most frequently used color. (For example, when coloring the inside of a block with two colors, the color with the highest frequency and the color with the second highest frequency are used.) Provided is an image processing device that performs the above processing and outputs the color to be colored in the block. It is intended to.

Means for Solving the Problems In order to solve the above problems, the present invention provides a color information table creation circuit that creates a table that can manipulate color information in an image memory for each pixel, and a color information table creation circuit created by the color information table creation circuit. a color information identification circuit that determines the color of a pixel using a table; and a same color counting circuit that counts the number of color information of the same color among the color information output from the color information identification circuit;
a color distribution detection circuit that compares the values counted by the same color counting circuit and detects the frequency of use of the color being used;
The block is configured to be colored using frequently used colors obtained by the color distribution detection circuit.

According to the above-described structure, the present invention divides image data colored for each pixel into blocks, detects the frequency distribution of colors within one block, and outputs frequently used color data.

By coloring the inside of the block using this color data, a relatively natural block colored image is created.

Embodiment FIG. 2 shows an embodiment of the image processing apparatus of the present invention incorporated into an image processing system. Image information is input through the console 12, processed by the central processing unit 10 according to a control program stored in the memory 13, and stored in the image memory 1. For simplicity, the image memory 1 has four layers in the depth direction and can display 16 colors, p, R,
G.

Let them be B and Y. The image data stored in the image memory 1 is displayed on the display device 11.

If the image data stored in the image memory 1 is to be colored in blocks, the central processing unit 1o outputs a command to start image processing to the image processing device 20. This instruction begins processing the contents of the image memory.

Various methods can be considered for coloring image data in blocks, but the contents of image memory 1 are divided into 4 x 4 pixel blocks as shown in Figure 3. Consider a method of coloring the inside of a block using two colors, the most used color and the second most used color among the 16 pixels from 101 to 116.

FIG. 1 shows a block diagram of an image processing apparatus according to the present invention. In response to instructions from the central processing unit 10, the color information table creation circuit 2 reads the contents of the image memory 1 block by block.
Process. Image memory 1 has R, G, B, Y in the depth direction.
Because there are four layers of
Since the color data in the depth direction cannot be read at once,
A color information table shown in FIG. 4 is created so that color data of pixels can be manipulated at once.

Note that the data input to the color information table here is ``1'' for the color to be used among R, G, B, and Y for each pixel, and ``0'' if not used.Follow. So, if 111'' is input only to R and G, the color of the 5 pixels will be the sum of R and G.In this way, read the data for the fR plane and get the result shown in Figure 4. Write data to the position of the same pixel number in the R column.Do the same on the G side.

This is also done for the B side and the Y side, and the color information table shown in FIG. 4 is completed. The color data of the color information table created by the color information table creation circuit 2 is read pixel by pixel by the color information reading circuit 3 and outputted to the color information identification circuit 4.

The color information identification circuit 4 outputs R, G,
The pixel color is determined based on the values of B and Y, and the 4 colors of R, G, B, and Y are determined.
Select one color from the 16 colors represented by the pits. That is, one color signal line is selected from among the 16 color signal lines corresponding to color information output from the color information identification circuit 4 for one pixel. Here, in the case of a block size of 4×4 pixels, there are 16 pixels, so 16 pixel colors are selected. The same color counting circuit 5 aggregates and counts the color information determined for each pixel by the color information identifying circuit 4. Among the 16 color signal lines output from each of the pixels 101 to 116, totaling 256 color signal lines, the color signal lines of the same color are collected, and the color information identification circuit 4 determines how many color signal lines there are for each of the same colors. Count whether it is selected. The color distribution detection circuit 6 receives the values counted for each color by the same color counting circuit 5, compares all these values, detects the frequency distribution of the color used within the block, and calculates the frequency distribution within the block. Color using a high color.

Effects of the Invention As described above, according to the present invention, image data colored for each pixel is divided into blocks, and the color to be colored in the block is determined using the frequency distribution of the colors used in the block. Since coloring is carried out in advance, a relatively natural block colored image can be obtained. Therefore, it is extremely useful in practical terms.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an image processing device according to an embodiment of the present invention, FIG. 2 is a block diagram of an image processing system incorporating the image processing device according to an embodiment of the present invention, and FIG. 3 is an image memory. Figure 4 is a conceptual diagram of a table that can manipulate color information pixel by pixel, Figure 6 is a block diagram showing a conventional example, and Figure 6 is a conceptual diagram of a conventional sampling method. . 1... Image memory 12... Color information table creation circuit, 3... Color information reading circuit, 4
...Color information identification circuit 16... Same color counting circuit, 6... Color distribution detection circuit, 10...
... Central processing unit 111 ... Display device, 12 ... Console, 13 ... Memory. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Porridge

Claims (1)

[Claims] An image memory that can color each pixel, a color information table creation circuit that creates a table that allows the internal color information of the image memory to be manipulated for each pixel, and a color information table creation circuit that creates a pixel color using the table created by the color information table creation circuit. A color information identification circuit that determines the color information, a same color counting circuit that counts the number of color information of the same color among the color information output from the color information identification circuit, and a value counted by the same color counting circuit is compared. and a color distribution detection circuit that detects the frequency of the color used, and divides image information colored for each pixel into blocks each consisting of a group of m×n pixels, m pixels in the vertical direction and n pixels in the horizontal direction, An image processing device characterized in that the inside of the block is colored using frequently used colors obtained by the color distribution detection circuit.