| CPC H04N 19/124 (2014.11) [H04N 19/105 (2014.11); H04N 19/11 (2014.11); H04N 19/136 (2014.11); H04N 19/176 (2014.11); H04N 19/184 (2014.11); H04N 19/52 (2014.11); H04N 19/593 (2014.11); H04N 19/91 (2014.11)] | 11 Claims |
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1. An intra prediction method for video decoding, comprising:
determining an intra prediction mode belonging to an initial directional prediction range for intra prediction of a M×N current block;
determining whether to modify the intra prediction mode from the initial directional prediction range into a modified directional prediction range based on a horizontal length (N) and a vertical length (M) of the M×N current block;
determining the modified intra prediction mode belonging to the modified directional prediction range; and
performing the intra prediction of the M×N current block based on the modified intra prediction mode,
wherein the initial directional prediction range comprises a first prediction range indicating center degrees, a second prediction range indicating higher degrees adjacent to the center degrees and a third prediction range indicating lower degrees adjacent to the center degrees,
wherein the modified directional prediction range is determined to comprise the first prediction range, the second prediction range and a fourth prediction range indicating higher degrees other than the second prediction range, according to the vertical length (M) of the M×N current block, and
wherein the intra prediction of the M×N current block is performed by using a reference region adjacent to the M×N current block, and
wherein the reference region includes a top reference pixel column and a left reference pixel column of the current block.
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