US 12,262,016 B2
Image processing device, bit stream generation method, coefficient data generation method, and quantization coefficient generation method
Takeshi Tsukuba, Tokyo (JP)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Appl. No. 17/778,002
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Nov. 27, 2020, PCT No. PCT/JP2020/044151
§ 371(c)(1), (2) Date May 19, 2022,
PCT Pub. No. WO2021/117500, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-223601 (JP), filed on Dec. 11, 2019.
Prior Publication US 2023/0007265 A1, Jan. 5, 2023
Int. Cl. H04N 19/66 (2014.01); H04N 19/103 (2014.01); H04N 19/124 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/46 (2014.01); H04N 19/60 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/103 (2014.11); H04N 19/124 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/46 (2014.11); H04N 19/60 (2014.11)] 11 Claims
OG exemplary drawing
 
1. An image processing device comprising:
a flag decoder that decodes coded data of a transform skip flag corresponding to a component identifier and obtains the transform skip flag corresponding to the component identifier, wherein the component identifier identifies luminance and chrominance;
a mode controller that controls, on a basis of the transform skip flag corresponding to the component identifier obtained by the flag decoder, whether a decoding mode of coded data of coefficient data corresponding to the component identifier is set to a transform skip (TS) residual decoding mode that is a mode for a case of skipping inverse transform processing of transforming coefficient data into a residual between an image and a predicted image, or set to a non-TS residual decoding mode that is a mode for a case of not skipping the inverse transform processing, wherein based on the transform skip flag, data of the residual is decoded according to a syntax structure corresponding to each decoding mode set by the mode controller; and
a coefficient data decoder that decodes the coded data of the coefficient data corresponding to the component identifier according to the decoding mode set by the mode controller, and generates the coefficient data corresponding to the component identifier,
wherein in a case that the TS residual decoding mode is set, when a number of residual context coding bins is determined to be equal to or greater than a threshold, context decoding is applied to decoding of a sign code, and when the number of residual context coding bins is determined to be not equal to or greater than the threshold, bypass decoding is applied to the decoding of the sign code, and
wherein in a case where the inverse transform processing is skipped, the coefficient data decoder shares a context variable between decoding of coded data of a luminance component of the coefficient data and decoding of coded data of a chrominance component.