Color quantization apparatus and method for frame buffer display

Details Color quantization apparatus and method for frame buffer display Color quantization apparatus and method for frame buffer display

1991-09-23

1994-11-15

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

345186, 345150, G09G 128

Patent

active

053652525

ABSTRACT:
A digital color image display system adapted to a frame buffer for displaying color images. The system includes apparatus for color quantization. The color distribution of a color image is stored in a memory device (HISTTABLE). The memory device has address format of r0g0b0r1g1b1. . . rnbnzn, where ri is ith bit in red color bits, gi is ith bit in green color bits, and bi is ith bit in blue color bits. Thus, each pixel can be mapped into one of the addresses of the memory device according to its three basic color bits (red, green and blue); and the three basic color bits form a color universe cell in a 3-dimensional space. To select 256 colors from a color image, the color universe cell is divided into 256 color cells according to the color distribution. Because the special address arrangement of the memory device, the division of the color universe cell can be easily accomplished by flipping one bit of the index to the memory device, thus increasing the speed to select 256 colors and reducing complexity of the hardware.

REFERENCES:
patent: 4901258 (1990-02-01), Akiyama
patent: 5049986 (1991-09-01), Aomo et al.
patent: 5087965 (1992-12-01), Torre-Bueno

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