Mip for all channels in the case of 4:4:4-chroma format and of single tree

Abstract

Block based decoder configured to partition a picture (10) of more than one color component (101, 102) and of a color sampling format, according to which each color component (101, 102) is equally sampled, into blocks using a partitioning scheme according to which the picture (10) is equally partitioned with respect to each color component (101, 102). Additionally, the block based decoder is configured to decode a first color component (101) of the picture (10) in units of the blocks with selecting, for each of intra-predicted first color component blocks (18'11-18'1n) of the picture (10), one out of a first set (508) of intra-prediction modes. The first set (508) comprises matrix-based intra prediction modes (5101 to 510m) according to each of which a block inner (18) is predicted by deriving a sample value vector (514) out of references samples (17), neighboring the block inner (18), computing a matrix-vector product (512) between the sample value vector (514) and a prediction matrix (516) associated with the respective matrix-based intra prediction mode (5101 to 510m) so as to obtain a prediction vector (518), and predicting samples in the block inner (18) on the basis of the prediction vector (518). Additionally, the block based decoder is configured to decode a second color component (102) of the picture (10) in units of the blocks by intra-predicting a predetermined second color component block (182) of the picture using the matrix-based intra prediction mode selected for a co-located intra-predicted first color component block (181).