ENTROPY CODER, VIDEO CODING APPARATUS, VIDEO CODING METHOD, AND VIDEO CODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To obtain an entropy coder, a video coding apparatus, a video coding method, and a video coding program capable of coping with an adverse effect in accordance with increase in a local overhead code amount.;SOLUTION: A quantization parameter output from a code amount controller of the video coding apparatus which is not illustrated is input in a third arithmetic unit 262 before it is input in a context initializer 143 in the entropy coder 215, and subtracted by a quantization parameter offset value 261 here. Mismatch regarding generation probability of a significant coefficient existence symbol in a macro block can be improved by initializing arithmetic coding context using a quantization parameter obtained by subtracting a prescribed value from a quantization parameter set by a rate controller.;COPYRIGHT: (C)2009,JPO&INPIT