Kiyotsugu Satoh

High-efficiency image-coding method using vector quantization and block coding

This paper proposes a high-efficiency image-coding method which is a two-step coding using a vector quantization and an adaptive block coding. This method is equivalent to separate quantizations of low- and high-frequency components of an image signal, and was applied to the luminance signal and monochrome image obtained from a color image. The results show that this method is superior to conventional vector quantization and adaptive block-coding method. The method was also applied successfully to a color image by converting its R, G and B signals to the Y, u and v signals, and by applying the two-step coding method to its Y signal (luminance) and the u and v signals (chromatic ones).