US 12,225,198 B2
MIP for all channels in the case of 4:4:4-chroma format and of single tree
Jonathan Pfaff, Berlin (DE); Tobias Hinz, Berlin (DE); Philipp Helle, Berlin (DE); Philipp Merkle, Berlin (DE); Björn Stallenberger, Berlin (DE); Michael Schäfer, Berlin (DE); Benjamin Bross, Berlin (DE); Heiko Schwarz, Berlin (DE); Detlev Marpe, Berlin (DE); and Thomas Wiegand, Berlin (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Appl. No. 17/916,574
Filed by Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V., Munich (DE)
PCT Filed Apr. 1, 2021, PCT No. PCT/EP2021/058558
§ 371(c)(1), (2) Date Oct. 1, 2022,
PCT Pub. No. WO2021/198402, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 20167808 (EP), filed on Apr. 2, 2020.
Prior Publication US 2023/0188720 A1, Jun. 15, 2023
Int. Cl. H04N 19/132 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of reconstructing a picture of more than one color component, the method comprising:
partitioning a first color component of the picture into coding tree blocks;
decoding a first block of the first color component using matrix-based intra prediction by selecting one out of a first set of intra-prediction modes, the first set comprising matrix-based intra prediction modes according to each of which an inner block is predicted by deriving a sample value vector out of references samples neighboring the inner block, computing a matrix-vector product between the sample value vector and a prediction matrix associated with the respective matrix-based intra prediction mode so as to obtain a prediction vector, and predicting samples in the inner block based on the prediction vector; and
decoding a second block of a second color component of the picture, which is co-located with the first block of the first color component using a direct mode, meaning that an intra prediction mode of the second block is derived based on the intra prediction mode selected for the first block of the first color component, the method further comprising determining whether or not a 4:4:4 color sampling format is used in which color components are equally sampled and also determining whether or not a single tree is used for partitioning the first and second color components into coding tree blocks, and if it is determined that both 4:4:4 color sampling and single tree are used, decoding the second block using the matrix-based intra prediction mode selected for the first block of the first color component and if it is determined that either or both of 4:4:4 color sampling and single tree are not used, then decoding the second block using a planar intra prediction mode.