| CPC H04N 19/132 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/80 (2014.11)] | 3 Claims |
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1. A video decoding method comprising:
obtaining, from a bitstream, intra prediction mode information indicating an intra prediction mode of a current coding block including a current transform block;
determining reference samples for intra prediction on the current transform block;
when the intra prediction mode indicated by the intra prediction mode information is an intra prediction mode with a diagonal prediction direction, filtering the reference samples;
determining a first value among a plurality of values including the first value and a second value as interpolation filter information for the filtered reference samples, wherein the first value indicates a first interpolation filter set and the second value indicates a second interpolation filter set;
determining the first interpolation filter set, among a plurality of interpolation filter sets including the first interpolation filter set and the second interpolation filter set, based on the interpolation filter information; and
obtaining prediction samples of the current transform block by performing an interpolation on the filtered reference samples using a plurality of first interpolation filter coefficients in the first interpolation filter set,
wherein:
the plurality of first interpolation filter coefficients in the first interpolation filter set are different from a plurality of second interpolation filter coefficients in the second interpolation filter set,
a difference between a maximum coefficient and a minimum coefficient among the plurality of first interpolation filter coefficients is greater than a difference between a maximum coefficient and a minimum coefficient among the plurality of second interpolation filter coefficients, and
the reference samples include reference samples adjacent to an upper side of the current transform block and reference samples adjacent to a left side of the current transform block.
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