US 11,695,917 B2
Image coding method and device using transform skip flag
Sunmi Yoo, Seoul (KR); Jungah Choi, Seoul (KR); Jangwon Choi, Seoul (KR); and Seunghwan Kim, Seoul (KR)
Assigned to Rosedale Dynamics LLC, Wilmington, DE (US)
Filed by Taissa Research LLC, Chicago, IL (US)
Filed on Feb. 10, 2022, as Appl. No. 17/669,044.
Application 17/669,044 is a continuation of application No. 17/138,494, filed on Dec. 30, 2020, granted, now 11,297,310.
Application 17/138,494 is a continuation of application No. 16/852,735, filed on Apr. 20, 2020, granted, now 10,917,637.
Application 16/852,735 is a continuation of application No. PCT/KR2020/000757, filed on Jan. 15, 2020.
Claims priority of provisional application 62/792,423, filed on Jan. 15, 2019.
Prior Publication US 2022/0174269 A1, Jun. 2, 2022
Int. Cl. H04N 19/103 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/103 (2014.11) [H04N 19/176 (2014.11); H04N 19/61 (2014.11)] 18 Claims
OG exemplary drawing
 
1. An apparatus for image decoding, the apparatus comprising:
memory storing instructions that, when executed, cause one or more processors to perform operations comprising:
obtaining prediction mode information and residual related information from a bitstream,
deriving prediction mode for a current block based on the prediction mode information,
deriving prediction samples of the current block based on the prediction mode, deriving residual samples of the current block based on the residual related information, and
generating reconstruction samples of the current block based on the prediction samples and the residual samples,
wherein the prediction mode information is related to whether inter prediction or intra prediction is applied to the current block,
wherein the residual related information comprises a transform skip flag based on a size of the current block and a maximum transform skip size, wherein the transform skip flag is related to whether a transform skip is applied to the current block,
wherein information about the maximum transform skip size is obtained from the bitstream,
wherein the information about the maximum transform skip size includes a log 2_transform_skip_max_size_minus2 syntax element, and
wherein the maximum transform skip size is derived based on the following equation,

OG Complex Work Unit Math
where the MaxTsSize represents the maximum transform skip size, and the log 2_transform_skip_max_size_minus2 represents a value of the log 2_transform_skip_max_size_minus2 syntax element.