CODING AND DECODING DEVICE FOR TIME-VARYING IMAGE

摘要

A coding and decoding device for a time-varying picture, by which a high picture quality is obtained from a smaller amount of information than a system using only DCT coding. The efficiency of coding can be increased and the block distortion of a composite image is reduced. An image is divided into several blocks, and each block is coded. At this time discrete cosine transformation coding (DCT) and intrablock predictive composing (NTC) are switched over to each other adequately according to the property of the image pattern. When the intrablock predictive composing is executed, the predictive value and quantization width of a block are transmitted.