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US 2026/0303812 A1Published application
Aps signaling-based video or image coding
AssigneeLG Electronics Inc.
InventorsSeethal PALURI, Seunghwan KIM, Jie ZHAO
Life of this patent
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Abstract
According to the present disclosure, ALF parameters and/or LMCS parameters can be hierarchically signaled, which enables a reduction in the amount of data to be signaled for video/image coding and an increase in the coding efficiency.
Claims4
An image decoding method performed by a decoding apparatus, the method comprising:
- receiving image information including prediction related information, residual information, mapping related data and adaptive loop filtering (ALF) data through a bitstream;
- deriving a prediction mode for a current block based on the prediction related information;
- deriving prediction samples of the current block based on the prediction mode;
- generating residual samples of the current block based on the residual information;
- generating reconstructed samples of the current block based on the prediction samples and the residual samples;
- and
- performing an inverse mapping process for the reconstructed samples based on the mapping related data,
- wherein the inverse mapping process includes deriving a value of a mapped reconstructed sample based on a value of a reconstructed sample of the current block and a mapping index,
- wherein the image information includes a first adaptation parameter set (APS) including the mapping related data, a second APS including the ALF data, and header information, wherein the header information includes ID information for the first APS, and ID information for the second APS,
- wherein the mapping related data is derived based on the ID information for the first APS,
- wherein the mapping index is derived based on the mapping related data,
- wherein the ALF data is derived based on the ID information for the second APS,
- wherein the ALF process includes a process for deriving ALF filter coefficients based on the ALF data, and
- wherein the ID information for the second APS is different from the ID information for the first APS.
11 more elements
An image encoding method performed by an encoding apparatus, the method comprising:
- determining a prediction mode for a current block;
- deriving prediction samples of the current block based on the prediction mode;
- generating prediction related information based on the determined prediction mode;
- deriving residual samples of the current block based on the prediction samples;
- generating residual information based on the residual samples;
- generating reconstructed samples of the current block based on the prediction samples and the residual samples;
- generating mapping related data for the reconstructed samples;
- generating adaptive loop filtering (ALF) data for the reconstructed samples;
- and
- encoding image information including the prediction related information, the residual information, the mapping related data, and the ALF data,
- wherein the image information includes a first Adaptation Parameter Set (APS) including the mapping related data, a second APS including the ALF data, and header information,
- wherein the header information includes ID information for the first APS, and ID information for the second APS,
- wherein the mapping related data includes information for deriving a mapping index indicating a mapping relationship between values of reconstructed samples of the current block,
- wherein the ALF data includes information for deriving ALF filter coefficients, and
- wherein the ID information for the second APS is different from the ID information for the first APS.
12 more elements
A method of transmitting data for an image, the method comprising:
- obtaining a bitstream for the image, wherein the bitstream is generated based on:
- determining a prediction mode for a current block;
- deriving prediction samples of the current block based on the prediction mode;
- generating prediction related information based on the determined prediction mode;
- deriving residual samples of the current block based on the prediction samples;
- generating residual information based on the residual samples;
- generating reconstructed samples of the current block based on the prediction samples and the residual samples;
- generating mapping related data for the reconstructed samples;
- generating adaptive loop filtering (ALF) data for the reconstructed samples;
- and encoding image information including the prediction related information, the residual information, the mapping related data, and the ALF data;
- and
- transmitting the data including the bitstream,
- wherein the image information includes a first Adaptation Parameter Set (APS) including the mapping related data, a second APS including the ALF data, and header information,
- wherein the header information includes ID information for the first APS, and ID information for the second APS,
- wherein the mapping related data includes information for deriving a mapping index indicating a mapping relationship between values of reconstructed samples of the current block,
- wherein the ALF data includes information for deriving ALF filter coefficients, and
- wherein the ID information for the second APS is different from the ID information for the first APS.
14 more elements
Dependencies are inferred from the claim text.