Patent ID: 8861594

Claim:
A method of decoding a video signal with a decoding apparatus, the method comprising: receiving, with the decoding apparatus, the video signal, the video signal including a current block including a chroma sample; obtaining, with the decoding apparatus, prediction type information from the video signal, the prediction type information indicating whether the current block is coded in an inter mode or an intra mode; and when the prediction type information indicates that the current block is coded in the intra mode, decoding, with the decoding apparatus, the chroma sample of the current block in the intra mode, wherein the decoding comprises: obtaining, with the decoding apparatus, a luma intra prediction mode of the current block, the luma intra prediction mode being one of intra prediction modes including a plurality of angular prediction modes; obtaining, with the decoding apparatus, index information of the current block from the video signal, the index information being used to specify a chroma intra prediction mode for the chroma sample, the chroma intra prediction mode being one of the intra prediction modes including the plurality of the angular prediction modes; deriving, with the decoding apparatus, from predefined table information, the chroma intra prediction mode based on the obtained luma intra prediction mode and the index information; and predicting, with the decoding apparatus, the chroma sample of the current block based on the derived chroma intra prediction mode; wherein the derived chroma intra prediction mode is equal to the obtained luma intra prediction mode when the index information indicates that the luma intra prediction mode is used as the chroma intra prediction mode.