高品位を保ちつつ画像の色素数を減らす方法について

抄録

The population equalization algorithm is proposed for color image quantization. It selects adequate colors fast, the number of which is the size of the video look-up table, so as to display an image with least degradation of image quality. After calculating 3-d histogram, partitions in the color cube are determined using the criterion that picture elements should be equally distributed among partitions. An enhancement of the error diffusion algorithm is also proposed to recover degraded image quality due to quantization. Combination of above algorithms makes it possible to reduce the number of colors down to 64 without perceptible degradation when a usual image is displayed on a high resolution CRT, whose pixel size is about 0.27mm by 0.27mm.