US 12,177,426 B2
Cross-component adaptive loop filter for chroma
Jonathan Taquet, Talensac (FR); Christophe Gisquet, Acigne (FR); Guillaume Laroche, Saint Aubin d'Aubigné (FR); and Patrice Onno, Rennes (FR)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Appl. No. 17/636,806
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
PCT Filed Aug. 18, 2020, PCT No. PCT/EP2020/073122
§ 371(c)(1), (2) Date Feb. 18, 2022,
PCT Pub. No. WO2021/032751, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 1911952.8 (GB), filed on Aug. 20, 2019.
Prior Publication US 2022/0312006 A1, Sep. 29, 2022
Int. Cl. H04N 19/117 (2014.01); H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/184 (2014.01); H04N 19/80 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/105 (2014.11); H04N 19/132 (2014.11); H04N 19/184 (2014.11); H04N 19/80 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of filtering an image portion using Cross Component Adaptive Loop Filter, the method comprising:
acquiring filter coefficients and first component sample values corresponding to samples surrounding a reference sample, and
using said filter coefficients and said first component sample values for the Cross Component Adaptive Loop Filter to produce an output of the Cross Component Adaptive Loop Filter for a second component,
wherein the method comprises restricting a possible value of each filter coefficient,
wherein the possible value of each filter coefficient is restricted to any one of zero and values of powers of two represented by a restricted number of bits.