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US 12,593,038 B2Granted
Temporal prediction of parameters in non-linear adaptive loop filter
AssigneesBeijing Bytedance Network Technology Co., Ltd., Bytedance Inc.
InventorsLi Zhang, Kai Zhang, Hongbin Liu, Yue Wang
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Abstract
Devices, systems and methods for temporal prediction of parameters in non-linear adaptive loop filtering are described. In an exemplary aspect, a method for visual media processing includes configuring, for a current video block, one or more parameters of a clipping operation that is part of a non-linear filtering operation; and performing, based on the one or more parameters, a conversion between the current video block and a bitstream representation of the current video block, wherein the one or more parameters is coded in accordance with a rule.
Claims18
A method of processing video data, comprising:
- determining, that a non-linear filtering operation is applied for a current video region of a video;
- determining, for the current video region, one or more parameters of a clipping operation that is part of the non-linear filtering operation;
- and
- performing, based on the one or more parameters, a conversion between the current video region and a bitstream of the video,
- wherein at least one first filtering index is derived, and a first clipping parameter set is derived based on the at least one first filtering index and the one or more parameters,
- wherein the one or more parameters are coded with a fixed length of N bits,
- wherein the at least one first filtering index is derived based on multiple sample differences in different directions,
- wherein the current video region is split into multiple M×M video sub-regions, and the multiple sample differences in different directions are derived for every M×M video sub-region,
- wherein M is equal to 2 or 4, and
- wherein the multiple sample differences in different directions are derived based on a 1:P subsampling rate, and wherein P is greater than 1.
7 more elements
An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
- determine, that a non-linear filtering operation is applied for a current video region of a video;
- determine, for the current video region, one or more parameters of a clipping operation that is part of the non-linear filtering operation;
- and
- perform, based on the one or more parameters, a conversion between the current video region and a bitstream of the video,
- wherein at least one first filtering index is derived, and a first clipping parameter set is derived based on the at least one first filtering index and the one or more parameters, and
- wherein the one or more parameters are coded with a fixed length of N bits,
- wherein the at least one first filtering index is derived based on multiple sample differences in different directions,
- wherein the current video region is split into multiple M×M video sub-regions, and the multiple sample differences in different directions are derived for every M×M video sub-region,
- wherein M is equal to 2 or 4, and
- wherein the multiple sample differences in different directions are derived based on a 1:P subsampling rate, and wherein P is greater than 1.
7 more elements
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- determine, that a non-linear filtering operation is applied for a current video region of a video;
- determine, for the current video region, one or more parameters of a clipping operation that is part of the non-linear filtering operation;
- and
- perform, based on the one or more parameters, a conversion between the current video region and a bitstream of the video,
- wherein at least one first filtering index is derived, and a first clipping parameter set is derived based on the at least one first filtering index and the one or more parameters, and
- wherein the one or more parameters are coded with a fixed length of N bits,
- wherein the at least one first filtering index is derived based on multiple sample differences in different directions,
- wherein the current video region is split into multiple M×M video sub-regions, and the multiple sample differences in different directions are derived for every M×M video sub-region,
- wherein M is equal to 2 or 4, and
- wherein the multiple sample differences in different directions are derived based on a 1:P subsampling rate, and wherein P is greater than 1.
7 more elements
A method for storing a bitstream of a video, comprising:
- determining, that a non-linear filtering operation is applied for a current video region of the video;
- determining, for the current video region, one or more parameters of a clipping operation that is part of the non-linear filtering operation;
- generating, based on the one or more parameters, for the current video region, the bitstream of the video, and
- storing the bitstream in a non-transitory computer-readable recording medium,
- wherein at least one first filtering index is derived, and a first clipping parameter set is derived based on the at least one first filtering index and the one or more parameters, and
- wherein the one or more parameters are coded with a fixed length of N bits,
- wherein the at least one first filtering index is derived based on multiple sample differences in different directions,
- wherein the current video region is split into multiple M×M video sub-regions, and the multiple sample differences in different directions are derived for every M×M video sub-region,
- wherein M is equal to 2 or 4, and
- wherein the multiple sample differences in different directions are derived based on a 1:P subsampling rate, and wherein P is greater than 1.
7 more elements
Dependencies are inferred from the claim text.