Patent ID: 9571843
Date: 2017-02-14
CPC Classifications: H04N

Claim:
1. A video decoding method comprising: determining whether an offset parameter of a current block is determined according to an offset parameter of a left block; in response to determining that the offset parameter of the current block is determined according to the offset parameter of the left block, determining the offset parameter of the current block to be identical to the offset parameter of the left block; in response to determining that the offset parameter of the current block is not determined according to the offset parameter of the left block, determining whether the offset parameter of the current block is determined according to an offset parameter of an upper block; in response to determining that the offset parameter of the current block is determined according to the offset parameter of the upper block, determining the offset parameter of the current block to be identical to the offset parameter of the upper block; in response to determining that the offset parameter of the current block is not determined according to the offset parameter of the upper block, obtaining, from a bitstream, offset type information of a luma component of the current block and offset type information of a chroma component of the current block; and compensating for samples of the current block by using the offset parameter of the current block, wherein the compensating for the samples of the current block by using the offset parameter of the current block comprises: when the offset type information of the luma component of the current block indicates an edge offset type, obtaining, from the bitstream, absolute values of luma offset values and a luma edge class indicating a direction of a luma edge of the current block and compensating for luma samples of the current block by using the absolute values of the luma offset values and the luma edge class; when the offset type information of the chroma component of the current block indicates the edge offset type, obtaining, from the bitstream, absolute values of chroma offset values and a chroma edge class indicating a direction of a chroma edge of the current block and compensating for chroma samples of the current block by using the absolute values of the chroma offset values and the chroma edge class; when the offset type information of the luma component of the current block indicates a band offset type, obtaining, from the bitstream, the absolute values of the luma offset values and signs of the luma offset values indicating whether the luma offset values are positive or negative, and compensating for the luma samples of the current block by using the absolute values of the luma offset values and the signs of luma offset values; and when the offset type information of the chroma component of the current block indicates the band offset type, obtaining, from the bitstream, the absolute values of the chroma offset values and signs of the chroma offset values indicating whether the chroma offset values are positive or negative, and compensating for the chroma samples of the current block by using the absolute values of the chroma offset values and the signs of chroma offset values.