均匀量化颜色选择算法的研究与实现

Color Selecting by Using Uniform Quantization

从彩色图象输入设备获得彩色图象，其红、绿、蓝３个分量均为１个字节，所以可表示２５６３种颜色。对一幅彩色图象的３个分量在其颜色值的范围内进行均匀量化，输出值均取６个等级，从而把一幅彩色图象转换成２１６种颜色。用这２１６种颜色修改彩色表，然后将量化后的图象数据写入显示缓冲区，从而实现对一幅彩色图象的显示。

When we get a color image from the input equipment,every component of R, G and B of the image pixels is presented by one byte. Therefore,there are 256 3 colors at most in a color image. Now we carry out an uniform quantization to each component in the range of its color values through a uniform quantizer, whose output can be taken as many as 6 values. By doing so, we can transform a color image of 256 3 colors to that of 216 colors. Updating the DAC register with the 216 colors and writing the quantized image data into display buffer area, we can display a color image at CRT displayer with TGVA card quickly.