US 12,262,028 B2
Method and device for encoding/decoding an image unit comprising image data represented by a luminance channel and at least one chrominance channel
Fabrice Urban, Thorigne Fouillard (FR); Franck Galpin, Thorigne-Fouillard (FR); Tangi Poirier, Rennes (FR); and Fabrice Leleannec, Mouazé (FR)
Assigned to INTERDIGITAL VC HOLDINGS, INC., Wilmington, DE (US)
Filed by INTERDIGITAL VC HOLDINGS, INC., Wilmington, DE (US)
Filed on Aug. 20, 2021, as Appl. No. 17/408,317.
Application 17/408,317 is a continuation of application No. 16/076,170, granted, now 11,109,045, previously published as PCT/EP2017/052316, filed on Feb. 3, 2017.
Claims priority of application No. 16305153 (EP), filed on Feb. 11, 2016.
Prior Publication US 2021/0385466 A1, Dec. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/186 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/186 (2014.11) [H04N 19/96 (2014.11)] 10 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a luma coding-tree representing a decomposition of a luminance unit representative of a luminance channel of an image unit in luminance sub-units until a final decomposition level, the luminance unit being a root of the luma coding tree; and
obtaining a chroma coding-tree representing a decomposition of a chrominance unit representative of a chrominance channel of the image unit in chrominance sub-units, the chrominance unit being a root of the chroma coding tree,
wherein obtaining the chroma coding-tree comprises:
signaling a single syntax element indicating a single decomposition level intermediate between the root of the luma coding tree and the final decomposition level where the decomposition of the chrominance unit in chrominance sub-units deviates from the decomposition of the luminance unit in luminance sub-units, the decomposition of the chrominance unit in chrominance sub-units following the decomposition of the luminance unit in luminance sub-units until the single decomposition level is reached, and, at the single decomposition level, the decomposition of the chrominance unit in chrominance sub-units stops while the decomposition of the luminance unit in additional luminance sub-units continues.