DCTを用いた限定色表示手法 : マルチメディア技術と一般 : 画像通信システム

抄録

In this paper, we propose a new method of color image quantization. This technology is for a color map display. which has a limited capability due to the size of a frame buffer. Firstly, a color image is segmented into some small blocks, and the number of colors to be as-signed to each block is determined according to t,he sharpness of the corresponding block. Sharper the block is, more colors are assigned to the block. A set of DCT coefficients of the block is used as a parameter of the sharpness. This met, hod enables to assign more colors to the characteristic area even if the area is small. Several experimental results show that the subjective quality. of the displayed image is improved especially for natural images.