METHOD AND APPARATUS FOR ENCODING RESIDUAL BLOCK, AND METHOD AND APPARATUS FOR DECODING RESIDUAL BLOCK

摘要

A decoding apparatus for decoding an image by obtaining transformation coefficients of a sub residual block based on location information of at least one non-zero transformation coefficient and level information of the at least one non-zero transformation coefficient obtained from a bitstream.

主权项

1. A method for decoding an image, the method comprising:
splitting the image into a plurality of maximum coding units; hierarchically splitting a maximum coding unit among the plurality of maximum coding units into a plurality of coding units; determining one or more transformation residual blocks from a coding unit among the plurality of coding units, wherein the one or more transformation residual blocks includes sub residual blocks; obtaining an effective coefficient flag of a sub residual block among the sub residual blocks from a bitstream, the effective coefficient flag of the sub residual block indicating whether at least one non-zero effective transformation coefficient exists in the sub residual block; when the effective coefficient flag indicates that at least one non-zero transformation coefficient exists in the sub residual block, obtaining transformation coefficients of the sub residual block based on location information of the at least one non-zero transformation coefficient and level information of the at least one non-zero transformation coefficient obtained from the bitstream; and inverse-transforming on a transformation residual block including the sub residual block based on the transformation coefficients of the sub residual block, wherein the transformation coefficients of the sub residual block are a subset of transformation coefficients of the transformation residual block, and wherein the transformation residual block is split into the sub residual blocks having a same size.