Method and apparatus for video encoding and decoding based on a linear model responsive to neighboring samples

Abstract

Implementations for video encoding and decoding based on a linear model responsive to neighboring samples are described. Accordingly, for a block being encoded or decoded in a picture, at least one spatial neighboring template is determined and at least one linear model parameter is determined based on reconstructed samples of the at least one spatial neighboring template. In a first embodiment, the number N of reconstructed samples corresponds to N=2 k with k chosen so that n is the maxim integer smaller than sum of the block width and block height. In a second embodiment, an offset for the relative position of a first sample in the template among samples of a left, respectively top, neighboring line of the block is determined. In a third embodiment, the number of reconstructed samples is set to a higher number in the larger dimension of the block.

1 . A method for video encoding, comprising:
 determining, for a block being encoded in a picture, at least one spatial neighboring template;   determining, for the block being encoded, at least one linear model parameter based on reconstructed samples of the at least one spatial neighboring template; and   encoding the block using a linear model based on the determined at least one linear model parameter;   wherein determining at least one spatial neighboring template comprises determining a number n of reconstructed samples in the at least one spatial neighboring template corresponding to n=2 k  with k chosen so that n is the maximum integer smaller than the sum of the block width and block height.   
     
     
         2 . A method for video decoding, comprising:
 determining, for a block being decoded, at least one spatial neighboring template;   determining, for the block being decoded, at least one linear model parameter based on reconstructed samples of the at least one spatial neighboring template; and   decoding the block using a linear model based on the determined at least one linear model parameter;   wherein determining at least one spatial neighboring template comprises determining a number n of reconstructed samples in the at least one spatial neighboring template corresponding to n=2 k  with k chosen so that n is the maximum integer smaller than the sum of the block width and block height.