US 12,238,282 B2
Image decoding device, image decoding method, and program
Kyohei Unno, Fujimino (JP); Kei Kawamura, Fujimino (JP); and Sei Naito, Fujimino (JP)
Assigned to KDDI CORPORATION, Tokyo (JP)
Filed by KDDI CORPORATION, Tokyo (JP)
Filed on Mar. 5, 2024, as Appl. No. 18/596,513.
Application 18/596,513 is a continuation of application No. 17/855,218, filed on Jun. 30, 2022, granted, now 11,949,860.
Application 17/855,218 is a continuation of application No. 17/187,025, filed on Feb. 26, 2021, granted, now 11,412,219, issued on Aug. 9, 2022.
Application 17/187,025 is a continuation of application No. PCT/JP2020/022975, filed on Jun. 11, 2020.
Claims priority of application No. 2019-114961 (JP), filed on Jun. 20, 2019; and application No. 2020-191512 (JP), filed on Nov. 18, 2020.
Prior Publication US 2024/0214568 A1, Jun. 27, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/117 (2014.01); H04N 19/184 (2014.01); H04N 19/186 (2014.01); H04N 19/30 (2014.01); H04N 19/82 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/184 (2014.11); H04N 19/186 (2014.11); H04N 19/30 (2014.11); H04N 19/82 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding device, comprising:
a class determination unit configured to use, as an input, a decoded signal prior to the filtering process and determine which class of filter is to be used;
a parameter determination unit configured to determine a filter coefficient for each class; and
a filter unit configured to use, as an input, the decoded signal prior to the filtering process and output a filtered decoded signal, wherein
the filter unit is configured to perform clipping processing on a differential value between a reference pixel value and a pixel value of the decoded signal prior to the filtering process such that an absolute value of the differential value is less than or equal to a predefined threshold value, and to generate the filtered decoded signal through the linear weighted addition of the value after the clipping processing is performed, the filter coefficient and the pixel value of the decoded signal prior to the filtering process;
the threshold value is set for each class and each filter coefficient; and
the threshold value for a luma signal is set to be greater than or equal to the threshold value for a chroma signal regardless of an internal bit depth.