METHOD AND APPARATUS FOR ENTROPY ENCODING USING HIERARCHICAL DATA UNIT, AND METHOD AND APPARATUS FOR DECODING

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for video decoding.SOLUTION: A method includes: obtaining, from a bitstream, a split transformation flag indicating whether or not a transformation unit included in a coding unit is split; determining at least one size of the transformation unit on the basis of the split transformation flag; determining a context model on the basis of the size of the transformation unit and a color type of a picture to which the transformation unit belongs; extracting a transformation coefficient flag indicating whether or not a non-zero transformation coefficient exists in a block of the transformation unit by entropy-decoding the bitstream by utilizing the determined context model; and obtaining a transformation coefficient in the transformation unit on the basis of the transformation coefficient flag.