| CPC H04N 19/105 (2014.11) [H04N 19/132 (2014.11); H04N 19/167 (2014.11); H04N 19/176 (2014.11); H04N 19/593 (2014.11)] | 11 Claims |
|
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining reference line index information and prediction information for a current block;
determining an intra prediction mode of the current block based on the prediction information;
deriving reference samples of the current block based on the intra prediction mode and the reference line index information; and
generating a prediction sample of the current block based on the reference samples,
wherein the intra prediction mode includes a non-directional intra prediction mode,
wherein the reference samples are derived from among neighboring samples of the current block based on the non-directional intra prediction mode and the reference line index information,
wherein the reference samples include only top neighboring samples and left neighboring samples of the current block, the top neighboring samples being located at coordinates from (0,−1−N) to (W−1,−1−N) and the left neighboring samples being located at coordinates from (−1−N, 0) to (−1−N, H−1) based on a coordinate (0, 0) of a top-left sample position of the current block,
wherein the N represents a reference line index value derived by the reference line index information and the N is greater than 0, and
wherein the W and the H represent a width and a height of the current block, respectively.
|