Intra prediction mode encoding method and apparatus for video prediction unit, and intra prediction mode decoding method and apparatus for video prediction unit

摘要

Provided are methods and apparatuses for efficiently encoding and decoding an intra prediction mode of a prediction unit of a chrominance component by using an intra prediction mode of a prediction unit of a luminance component. The method of encoding an intra prediction mode includes: according to whether an intra prediction mode of a prediction unit of a luminance component is the same as any of predetermined intra prediction modes in an intra prediction mode candidate group applicable to a prediction unit of a chrominance component, reconstructing the intra prediction mode candidate group of the prediction unit of the chrominance component by excluding an intra prediction mode of the prediction unit of the chrominance component which is same as an intra prediction mode of the prediction unit of the luminance component from the intra prediction mode candidate group or replacing an intra prediction mode of the prediction unit of the chrominance component which is same as an intra prediction mode of the prediction unit of the luminance component with another intra prediction mode, and encoding the intra prediction mode of the prediction unit of the chrominance component by using the reconstructed intra prediction mode candidate group.