US 11,695,933 B2
Sample sets and new down-sampling schemes for linear component sample prediction
Patrice Onno, Rennes (FR); Christophe Gisquet, Acigne (FR); Guillaume Laroche, Saint Aubin d'Aubigné (FR); and Jonathan Taquet, Talensac (FR)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 4, 2021, as Appl. No. 17/519,394.
Application 17/519,394 is a continuation of application No. 16/971,669, granted, now 11,196,998, previously published as PCT/EP2019/054377, filed on Feb. 21, 2019.
Claims priority of application No. 1802972 (GB), filed on Feb. 23, 2018; and application No. 1820023 (GB), filed on Dec. 7, 2018.
Prior Publication US 2022/0132131 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/00 (2014.01); H04N 19/132 (2014.01); H04N 19/105 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/189 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/105 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/189 (2014.11)] 8 Claims
OG exemplary drawing
 
1. A method for encoding images by deriving parameters of a linear model for obtaining a chroma sample of a target area from an associated luma sample of the target area, the method comprising:
determining two pairs of values for determining the parameters of the linear model, each of the two pairs being defined by two variables, a first variable of the two variables corresponding to a luma sample, a second variable of the two variables corresponding to a chroma sample;
determining the parameters of the linear model including a parameter corresponding to a slope of the linear model by using the two pairs of values; and
encoding the target area using the parameters of the linear model,
wherein a magnitude of the parameter corresponding to the slope is restricted so that a number of bits to represent the slope in integer arithmetic does not exceed 5 bits.