METHOD AND APPARATUS FOR ENCODING AND DECODING A BLOCK OF VIDEO SAMPLES

Abstract

A method and apparatus of decoding a transform block from a bitstream. The method comprising decoding a first flag used to determine whether to use dependent quantization in the transform block; determining whether to use sign bit hiding in the transform block, wherein, in the sign bit hiding, data indicating a sign of a significant coefficient in a given position of the transform block is not decoded from the bitstream, wherein, if the first flag is TRUE, the sign bit hiding shall not be used in the transform block; decoding the transform block by using the dependent quantization if it is determined based on the first flag to use the dependent quantization in the transform block; and decoding the transform block by using the sign bit hiding if it is determined to use the sign bit hiding in the transform block, wherein, in a state where (a) a disabled flag for transform skip residual coding is checked after the first flag is checked and (b) the disabled flag is TRUE, the dependent quantization shall not be used in the transform block, wherein in a state where the disabled flag is TRUE, the sign bit hiding is not used in the transform block, even if a difference between a first significant position and a last significant position is greater than three, and wherein the disabled flag indicates whether a first residual coding is applied instead of a second residual coding even if a transform process is skipped, the first residual coding being for a block in which a transform process is not skipped, and the second residual coding being for a block in which a transform process is skipped. Fig. 1

Specification

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