Patent ID: 9554157
Date: 2017-01-24
CPC Classifications: H04N

Claim:
1. A method for decoding a video, the method comprising: receiving, from a bitstream, split information of a coding unit corresponding to a coded depth split from a maximum coding unit, the split information indicating whether the coding unit corresponding to the coded depth is split into a plurality of coding units corresponding to a lower depth; when the split information indicates the coding unit corresponding to the coded depth is no longer split into the coding units corresponding to the lower depth, receiving, from the bitstream, information about an intra prediction mode of a prediction unit of the coding unit corresponding to the coded depth; when the information about the intra prediction mode of the prediction unit contains one bit, obtaining an intra prediction mode bitstring by performing context-based arithmetic decoding on the one bit; when the information about the intra prediction mode of the prediction unit contains a plurality of bits, obtaining an intra prediction mode bitstring by performing context-based arithmetic decoding on a first bit among the plurality of bits and by performing bypass mode decoding on at least one bit among the plurality of bits excluding the first bit; and reconstructing a symbol indicating an intra prediction direction of the prediction unit by performing inverse binarization on the intra prediction mode bitstring according to a binarization scheme, wherein the intra prediction mode includes an intra chroma prediction mode indicating an intra prediction direction for chroma samples of the prediction unit.