Adaptive loop filtering-based image coding apparatus and method
AssigneeLG Electronics Inc.
InventorsSeethal Paluri, Hendry Hendry
Life of this patent
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Abstract
According to embodiment(s) of the present document, computational overhead and complexity can be reduced by using a 0th-order exponential Golomb coding scheme (ue(v)) for procedures of parsing syntax elements/information about absolute values of luma/chroma ALF filter coefficients. In addition, coding using ue(v) can be efficiently performed by fixing the range of values of the information about the absolute values of the luma/chroma ALF filter coefficients.
Claims15
An image decoding method performed by a decoding apparatus, the method comprising:
- receiving image information through a bitstream;
- generating reconstructed samples based on the image information;
- deriving ALF data for an adaptive loop filter (ALF) procedure of the reconstructed samples;
- and
- performing the ALF procedure of the reconstructed samples based on the ALF data,
- wherein the performing the ALF procedure comprises:
- deriving absolute values of luma filter coefficients for the ALF procedure based on the ALF data;
- deriving luma filter coefficients for the ALF procedure based on the absolute values of luma filter coefficients for the ALF procedure;
- and
- generating modified luma reconstructed samples based on the reconstructed samples and the luma filter coefficients,
- wherein the ALF data includes information related to absolute values of luma filter coefficients for the ALF procedure, and
- wherein the information related to absolute values of luma filter coefficients for the ALF procedure is coded based on ue(v).
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving residual samples for a current block;
- generating residual information based on the residual samples;
- generating reconstructed samples based on the residual information;
- generating ALF data for an adaptive loop filter (ALF) procedure of the reconstructed samples;
- and
- encoding image information including the residual information and the ALF data,
- wherein the ALF data includes information related to absolute values of luma filter coefficients for the ALF procedure, and
- wherein the information related to absolute values of luma filter coefficients for the ALF procedure is coded based on ue(v).
A non-transitory computer readable digital storage medium storing a bitstream generated by a image encoding method, the image encoding method comprising:
- deriving residual samples for a current block;
- generating residual information based on the residual samples;
- generating reconstructed samples based on the residual information;
- generating ALF data for an adaptive loop filter (ALF) procedure of the reconstructed samples;
- and
- encoding image information to generate the bitstream, wherein the image information includes the residual information and the ALF data,
- wherein the ALF data includes information related to absolute values of luma filter coefficients for the ALF procedure, and
- wherein the information related to absolute values of luma filter coefficients for the ALF procedure is coded based on ue(v).
Dependencies are inferred from the claim text.