Encoding and decoding image using sample adaptive offset with start band indicator

摘要

A method for image decoding includes receiving image information including filter coefficients, generating a restored block for a current block on the basis of the image information; and applying an adaptive loop filter to the restored block on the basis of the filter coefficients. Image encoding efficiency may be improved, and complexity may be reduced.

主权项

1. A video decoding method by a video decoding apparatus, comprising:
receiving video information including picture reconstruction information for reconstructing a picture and offset information for sample adaptive offset (SAO) process; reconstructing the picture on the basis of the picture reconstruction information; and applying an in-loop filtering process to the reconstructed picture, wherein applying the in-loop filtering process includes
applying a deblocking filtering process to the reconstructed picture, andapplying the SAO process to a sample in the reconstructed picture to which the deblocking filtering process is completed, wherein the offset information includes offset type information indicating whether an edge offset type is applied to the sample, or a band offset type is applied to the sample, wherein when the offset type information indicating the band offset type is applied to the sample, the offset information includes an explicit band information indicating one of 32 bands as a starting band of a band group consisting of n bands among the 32 bands, the band group is determined based on the starting band, and an offset corresponding a band among the n bands is applied to the sample, wherein n is an integer.