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US 2023/0057415 A1Published application
Cross component filtering-based image coding apparatus and method
AssigneeLG Electronics Inc.
InventorsJunghak NAM, Jangwon CHOI
Life of this patent
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Abstract
According to one embodiment of the present document, a cross component adaptive loop filtering (CCALF) process may be performed. The CCALF process can enhance the filtering performance for chroma components and improve the subjective/objective image quality of a picture.
Claims17
A decoding apparatus for image decoding, the decoding apparatus comprising:
- a memory;
- and
- at least one processor connected to the memory, the at least one processor configured to:
- receive image information through a bitstream;
- generate reconstructed luma samples and reconstructed chroma samples based on the image information;
- perform an adaptive loop filtering (ALF) process on the reconstructed chroma samples to generate filtered reconstructed chroma samples;
- and
- perform a cross-component filtering process on the filtered reconstructed chroma samples to generate modified filtered reconstructed chroma samples,
- wherein the image information includes an adaptation parameter set (APS) including ALF data including information on cross-component filtering,
- wherein the ALF data includes information on a number of cross-component filters for the cross-component filtering and information on cross-component filter coefficients, and
- wherein the modified filtered reconstructed chroma samples are generated based on the filtered reconstructed chroma samples and the cross-component filter coefficients.
8 more elements
An encoding apparatus for image encoding, the encoding apparatus comprising:
- a memory;
- and
- at least one processor connected to the memory, the at least one processor configured to:
- generate reconstructed samples including reconstructed luma samples and reconstructed chroma samples of a current block in a current picture;
- derive adaptive loop filtering (ALF) filter coefficients for an ALF process;
- generate ALF-related information based on the ALF filter coefficients;
- derive cross-component filter coefficients for a cross-component filtering process;
- generate cross-component filtering-related information based on the cross-component filter coefficients;
- and
- encode image information including information for generating the reconstructed samples, the ALF-related information, and the cross-component filtering-related information,
- wherein the cross-component filtering-related information includes information on a number of cross-component filters and information on cross-component filter coefficients.
8 more elements
An apparatus for transmitting data for an image, the apparatus comprising:
- at least one processor configured to obtain a bitstream for the image, wherein the bitstream is generated based on generating reconstructed samples including reconstructed luma samples and reconstructed chroma samples of a current block in a current picture, deriving adaptation loop filtering (ALF) filter coefficients for an ALF process, generating ALF-related information based on the ALF filter coefficients, deriving cross-component filter coefficients for a cross-component filtering process, generating cross-component filtering-related information based on the cross-component filter coefficients, and encoding image information to generate the bitstream, wherein the image information includes information for generating the reconstructed samples, the ALF-related information, and the cross-component filtering-related information;
- and
- a transmitter configured to transmit the data comprising the bitstream,
- wherein the cross-component filtering-related information includes information on a number of cross-component filters and information on cross-component filter coefficients.
1 more element
Dependencies are inferred from the claim text.