| CPC H04N 19/159 (2014.11) [H04N 19/176 (2014.11); H04N 19/61 (2014.11); H04N 19/625 (2014.11)] | 2 Claims |
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1. An encoder comprising:
a processor; and
memory,
wherein, using the memory, the processor:
determines whether intra prediction is to be used for a current block and whether the current block has a determined size;
when it is determined that intra prediction is to be used for the current block and that the current block has the determined size, further determines whether an intra prediction mode for the current block is a determined mode;
performs first transform of residual signals of the current block to generate first transform coefficients;
when the intra prediction mode is not the determined mode, performs second transform of the first coefficients to generate second transform coefficients, and further performs quantization of the second transform coefficients; and
when the intra prediction mode is the determined mode, performs quantization of the first transform coefficients.
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