Arithmetic decoding device, image decoding device, arithmetic coding device, image coding device, and arithmetic decoding method

摘要

The amount of processing is reduced with high coding efficiency maintained. There is provided an arithmetic decoding device including syntax decoding means for decoding each of at least a first syntax element and a second syntax element indicating a transform coefficient using arithmetic decoding with a context or arithmetic decoding without a context. The syntax decoding means performs decoding that at least includes not decoding the first syntax element and decoding the second syntax element using the arithmetic decoding without a context, and decoding the first syntax element using the arithmetic decoding with a context and decoding the second syntax element using the arithmetic decoding without a context.

主权项

1. An arithmetic decoding device for arithmetically decoding coded data of a transform coefficient obtained by performing a frequency transform on a target image for each unit region, comprising:
syntax decoding circuitry that decodes a first syntax element and a second syntax element that indicate the transform coefficient; wherein the first syntax element is decoded by using arithmetic decoding with a context or arithmetic decoding without a context, the second syntax element is decoded without a context, and the syntax decoding circuitry performs decoding that at least includes both: (i) not decoding the first syntax element and decoding the second syntax element, and (ii) decoding the first syntax element and the second syntax element.