Patent ID: 9300974
Filing Date: 2016-03-29
CPC Classification: H04N

Claim Text:
1. A method of decoding, based on loss coding, a video signal having a current block to be decoded with a decoding apparatus, comprising: obtaining residual coefficients relating to the current block and transform skip mode information for the current block from the video signal, wherein the residual coefficients include first residual coefficients relating to luma components of the current block and second residual coefficients relating to chroma components of the current block, wherein the transform skip mode information includes a first transform skip flag and a second transform skip flag, wherein the first transform skip flag specifies whether an inverse-transform is performed or skipped on first inverse-quantized residual coefficients resulting from inverse-quantizing the first residual coefficients relating to the luma components of the current block and the second transform skip flag specifies whether the inverse-transform is performed or skipped on second inverse-quantized residual coefficients resulting from inverse-quantizing the second residual coefficients relating to the chroma components of the current block, and wherein the first transform skip flag relating to the luma components and the second transform skip flag relating to the chroma components are signaled independently from each other; obtaining inverse-quantized residual coefficient by inverse-quantizing the residual coefficients, the inverse-quantized residual coefficients including the first inverse-quantized residual coefficients and the second inverse-quantized residual coefficients; obtaining residual samples of the current block by selectively performing the inverse-transform for the first inverse-quantized residual coefficients based on the first transform skip flag and selectively performing the inverse-transform for the second inverse-quantized residual coefficients based on the second transform skip flag; obtaining prediction samples of the current block by using motion information of the current block; and reconstructing the current block by using the residual samples and the prediction samples.