| CPC H04N 19/136 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/96 (2014.11)] | 9 Claims |
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1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
determining whether to apply intra prediction to a current chroma block based on information on prediction of the current chroma block;
deriving an intra prediction mode of the current chroma block based on intra prediction being applied to the current chroma block; and
generating a prediction block of the current chroma block, by performing intra prediction based on the intra prediction mode of the current chroma block,
wherein the intra prediction mode of the current chroma block is derived based on an intra prediction mode of the corresponding luma block and intra chroma prediction mode information of the current chroma block,
wherein, based on a corresponding luma block not being intra predicted, the intra prediction mode of the current chroma block is derived based on a default intra prediction mode,
wherein the deriving the intra prediction mode of the current chroma block comprises determining a prediction method at a predetermined position of the corresponding luma block,
wherein, based on the prediction method at the predetermined position of the corresponding luma block being an intra block copy (IBC) prediction, the intra prediction mode of the current chroma block is derived based on the default intra prediction mode, and
wherein the default intra prediction mode is a DC mode.
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