High efficiency coding apparatus.

摘要

A high efficiency coding apparatus performs the control so that the amount of generated information does not surpass a transmission capacity of a transmission path when variable-length coding for varying a word length corresponding to a dynamic range. With respect to a still block, distribution in which a movement amount is introduced is formed taking into account that frame-dropping processing is made to obtain the number of dynamic range occurrence. Not only threshold values in the level direction for defining a word length but also movement threshold values for the frame-dropping processing are changed to control the amount of generated information. As a result, the control of the amount of generated information is performed excellently without an increase in quantization errors.