Patent ID: 9596474
Date: 2017-03-14
CPC Classifications: H04N

Claim:
1. A video decoding method comprising: obtaining, from a bitstream, a split transformation flag indicating whether a transformation unit included in a coding unit is split; obtaining a current transformation unit from the coding unit based on the split transformation flag; determining a context model using a context model index determined based on a size of the current transformation unit and a value of a color component index of a picture to which the transformation unit belongs, without using any syntax elements from blocks neighboring the coding unit; obtaining a transformation coefficient flag indicating whether at least one non-zero coefficient is included in a block of the current transformation unit by entropy-decoding the bitstream based on the context model; and obtaining a transformation coefficient included in the current transformation unit based on the transformation coefficient flag, wherein the color component index is set with respect to a luminance component, a first chrominance component, and a second chrominance component and the color component index for the luminance component has a value of zero, the color component index for the first chrominance component has a value of one, and the color component index for the second chrominance component has a value of two, wherein the entropy-decoding is performed according to a context-adaptive binary arithmetic decoding process, and wherein the context model includes information indicating a most probable symbol (MPS).