Method and device for encoding intra prediction mode for image prediction unit, and method and device for decoding intra prediction mode for image prediction unit

摘要

Disclosed are a method and a device for efficiently encoding and decoding an intra prediction mode for a prediction unit of a chrominance component by using an intra prediction mode for a prediction unit of a luminance component. According to one embodiment of the present invention, a method for encoding an intra prediction mode enables: intra prediction mode candidate groups of a prediction unit of a chrominance component to be reconfigured by excluding, from the intra prediction mode candidate groups, an intra prediction mode of the prediction unit of the chrominance component, which is overlapped with an intra prediction mode of a prediction unit of a luminance component, or by replacing the intra prediction mode with another intra prediction mode, depending on whether the intra prediction mode for the prediction unit of the luminance component is the same as predetermined intra prediction modes among the intra prediction mode candidate groups that are usable for the prediction unit of the chrominance component; and the intra prediction mode of the prediction unit of the chrominance component to be encoded by using the reconfigured intra prediction mode candidate groups.