US 11,856,198 B2
Image decoding device, method, and non-transitory computer-readable storage medium
Masato Shima, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 3, 2021, as Appl. No. 17/542,254.
Application 17/542,254 is a continuation of application No. PCT/JP2020/015216, filed on Apr. 2, 2020.
Claims priority of application No. 2019-107454 (JP), filed on Jun. 7, 2019.
Prior Publication US 2022/0094937 A1, Mar. 24, 2022
Int. Cl. H04N 19/126 (2014.01); H04N 19/18 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/126 (2014.11) [H04N 19/18 (2014.11); H04N 19/186 (2014.11)] 9 Claims
OG exemplary drawing
 
1. An image decoding device decoding coded data of an image, comprising:
a decoding unit configured to decode, from the coded data, data corresponding to quantized transform coefficients; and
a deriving unit configured to derive prediction errors from the decoded data by performing at least inverse quantization using a quantization matrix,
wherein prediction errors corresponding to a chroma component can be derived using a first mode,
wherein the image includes a plurality of chroma components,
wherein the first mode is a mode in which encoded data of first quantized transform coefficients associated with a first chroma component among the plurality of chroma components is omitted in the coded data,
wherein, in the first mode, the deriving unit is configured to derive first prediction errors of the first chroma component, using quantized transform coefficients associated with a chroma component different from the first chroma component, and
wherein, in the first mode, the deriving unit is configured to perform inverse quantization on the quantized transform coefficients used to derive the first prediction errors of the first chroma component, using the quantizing matrix corresponding to the chroma component different from the first chroma component.