Patent ID: 8942284
Filing Date: 2015-01-27
Classification: H04N

Abstract:
1. A method for decoding chroma image, comprising: deriving a chroma intra prediction mode of a prediction unit; determining a size of a chroma prediction block using luma transform size information; generating the chroma prediction block using the chroma intra prediction mode; generating a chroma residual block using the chroma intra prediction mode and a chroma quantization parameter; and generating a chroma reconstructed block adding the chroma prediction block and the chroma residual block, wherein the chroma quantization parameter is generated using a luma quantization parameter and information indicating the relationship between the luma quantization parameter and the chroma quantization parameter, and the luma quantization parameter is generated using a luma quantization parameter predictor and a luma differential quantization parameter, the luma quantization parameter predictor is generated using two quantization parameters which are determined in a predetermined order among a left luma quantization parameter, an above luma quantization parameter and a previous luma quantization parameter when two or three luma quantization parameters are available.