US 12,244,815 B2
Methods and devices for coding and decoding a data stream representing at least one image
Félix Henry, Chatillon (FR); Mohsen Abdoli, Chatillon (FR); Pierrick Philippe, Chatillon (FR); and Gordon Clare, Chatillon (FR)
Assigned to ORANGE, Issy-les-Moulineaux (FR)
Filed by ORANGE, Issy-les-Moulineaux (FR)
Filed on Feb. 21, 2023, as Appl. No. 18/171,934.
Application 18/171,934 is a continuation of application No. 17/277,972, granted, now 11,616,958, previously published as PCT/FR2019/052028, filed on Sep. 3, 2019.
Claims priority of application No. 1858571 (FR), filed on Sep. 21, 2018.
Prior Publication US 2023/0199193 A1, Jun. 22, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/136 (2014.01); H04N 19/119 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/136 (2014.11) [H04N 19/119 (2014.11); H04N 19/176 (2014.11); H04N 19/61 (2014.11)] 16 Claims
OG exemplary drawing
 
1. A method for decoding a coded data stream representative of at least one image, said image being split into blocks, wherein the method comprises the following acts performed by a decoding device, for at least one block of the image, referred to as a current block:
reading from the data stream a threshold value defining a block size,
determining whether a size of the current block is less than or equal to said threshold value,
if the size of the current block is less than or equal to said threshold value, decoding an item of information indicating a coding mode of the current block among a first coding mode and a second coding mode and reconstructing the current block according to the coding mode indicated by the decoded item of information, and
if the size of the current block is greater than said threshold value, reconstructing the current block according to the first coding mode,
the first coding mode corresponding to a coding mode according to which the current block is reconstructed using an inverse transform of a transformed prediction residue decoded for the current block, and the second coding mode corresponding to a coding mode according to which the current block is not reconstructed using an inverse transform of a transformed prediction residue decoded for the current block, but by:
scanning each pixel of the current block according to a scanning order, said scanning comprising, for said pixel of the current block:
obtaining a prediction of said pixel from another previously decoded pixel, said other previously decoded pixel belonging to said current block or to a previously decoded block of the image, and
reconstructing said pixel from the prediction of said pixel obtained and a decoded prediction residue associated with said pixel.