| CPC H04N 19/593 (2014.11) | 5 Claims |
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1. An image decoding method performed by an image decoding apparatus, comprising:
determining that multi-sample prediction is applied to a current block based on an intra prediction mode of the current block, the current block being a prediction unit to which the intra prediction mode is applied;
determining a representative prediction value for a sample group, the sample group being a region inside the current block, being smaller than the current block, and being predicted as the same representative prediction value;
predicting a plurality of samples included in the sample group using the determined representative prediction value;
generating a prediction block of the current block based on the determined representative prediction value; and
reconstructing the current block based on the prediction block and a residual block of the current block,
filtering the reconstructed current block based on an in-loop filter;
wherein the representative prediction value is computed using reference sample values of a plurality of reference samples,
wherein other samples inside the current block which are not included in the sample group are predicted differently from the plurality of samples included in the sample group,
wherein the multi-sample prediction is performed based on a determination of whether the size of the current block is less than 32×32, and
wherein the residual block of the current block is obtained by decoding a bitstream.
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