VIDEO ENCODING METHOD USING OFFSET ADJUSTMENT ACCORDING TO CLASSIFICATION OF PIXELS BY MAXIMUM ENCODING UNITS AND APPARATUS THEREOF, AND VIDEO DECODING METHOD AND APPARATUS THEREOF

摘要

A video decoding method includes extracting offset mergence information of a current largest coding unit (LCU), the offset mergence information indicating whether to adopt a second offset parameter as a first offset parameter of the current LCU; reconstructing the first offset parameter of the current LCU based on the offset mergence information, the first offset parameter including an offset type, an offset value, and an offset class of the current LCU; determining whether the current LCU is an edge type or a band type, based on the offset type; determining an edge direction according to the edge type or a band range according to the band type, based on the offset class; determining a difference value between reconstructed pixels and original pixels included in the offset class, based on the offset value; and adjusting pixel values of reconstructed pixels based on the difference value.

主权项

1. A video decoding method comprising:
obtaining, from a bitstream, left offset merging information indicating whether an offset parameter of a current block is determined according to an offset parameter of a left block; when the left offset merging information indicates that the offset parameter of the current block is determined according to the offset parameter of the left block, determining an offset parameter of a luma component of the current block using an offset type of a luma component of the left block and determining an offset type of a chroma component of the current block using an offset type of a chroma component of the left block; when the left offset merging information indicates that the offset parameter of the current block is not determined according to the offset parameter of the left block, obtaining, from a bitstream, upper offset merging information indicating whether the offset parameter of the current block is determined according to an offset parameter of an upper block; when the upper offset merging information indicates that the offset parameter of the current block is determined according to the offset parameter of the upper block, determining an offset type of a luma component of the current block using an offset type of a luma component of the upper block and determining an offset type of a chroma component of the current block using an offset type of a chroma component of the upper block; when the upper offset merging information indicates that the offset parameter of the current block is not determined according to the offset parameter of the upper block, obtaining, from the bitstream, offset type information of the luma component of the current block and offset type information of the chroma component of the current block; when the offset type information of the luma component of the current block indicates a band offset type, obtaining, from the bitstream, a band class indicating a start location of bands of the luma component of the current block; when the offset type information of the chroma component of the current block indicates the band offset type, obtaining, from the bitstream, a band class indicating a start location of bands of the chroma component of the current block; and compensating for samples of the current block by using offset values, wherein the offset parameter includes at least one of the offset type information and the offset values, the offset type information indicates the offset type or whether to apply the offset values to the current block, and the offset type is one of the band offset type and an edge offset type.