US 12,355,972 B2
Image encoding/decoding method and apparatus using BDPCM, and recording medium storing bitstream
Byeung Woo Jeon, Seongnam-si (KR); and Jee Yoon Park, Seoul (KR)
Assigned to Research & Business Foundation Sungkyunkwan University, Suwon-si (KR)
Appl. No. 17/791,698
Filed by Research & Business Foundation Sungkyunkwan University, Suwon-si (KR)
PCT Filed Jan. 11, 2021, PCT No. PCT/KR2021/000309
§ 371(c)(1), (2) Date Jul. 8, 2022,
PCT Pub. No. WO2021/141462, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 10-2020-0003617 (KR), filed on Jan. 10, 2020.
Prior Publication US 2023/0044258 A1, Feb. 9, 2023
Int. Cl. H04N 19/136 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/136 (2014.11) [H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 23 Claims
OG exemplary drawing
 
1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
obtaining first information indicating whether block-based differential pulse coded modulation (BDPCM) is applicable to a current image;
obtaining second information indicating whether to apply the BDPCM to a current block in the current image based on the first information;
obtaining third information indicating a prediction direction of the BDPCM based on the second information; and
applying the BDPCM to the current block based on the prediction direction of the BDPCM,
wherein the first information indicates whether BDPCM is enabled for both a luma component and a chroma component of the current block, and
wherein the second information for the chroma component and the third information for the chroma component are obtained from a bitstream based on a color format of the current image being a 4:2:0 color format or a 4:2:2 color format.