# US 12,010,347 B2 · System and method for video coding

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- Number: US 12,010,347 B2
- Document ID: US12010347B2
- Status: Granted
- Kind: B2
- Application number: 17/685,226
- Filed: 2022-03-02
- Published: 2022-06-16
- Granted: 2024-06-11
- Earliest claimed: 2019-09-03
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Che-Wei Kuo; Chong Soon Lim; Jing Ya Li; Han Boon Teo; Hai Wei Sun; Chu Tong Wang; Tadamasa Toma; Takahiro Nishi; Kiyofumi Abe; Yusuke Kato
- Web page: https://patentgrep.com/patent/US12010347B2

## CPC

- H04N 19/82: involving filtering within a prediction loop
- H04N 19/91: Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
- H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635)
- H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
- H04N 19/124: Quantisation
- H04N 19/13: Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/18: the unit being a set of transform coefficients
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/593: involving spatial prediction techniques
- H04N 19/61: in combination with predictive coding
- H04N 19/96: Tree coding, e.g. quad-tree coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An encoder includes circuitry and memory. The circuitry, in operation, generates a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component. The circuitry generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component. The circuitry generates a third coefficient value by adding the first coefficient value to the second coefficient value, and encodes a third reconstructed image sample of the chroma component using the third coefficient value. The circuitry determines a first parameter having the same value for Cb component and Cr component of the chroma component. The circuitry determines, using the first parameter, a model of entropy coding from a plurality of models. The circuitry performs, using the model, the entropy coding of a second parameter of the CCALF process.

## Claims

### Claim 1

An encoder, comprising:
circuitry; and
memory coupled to the circuitry;
wherein the circuitry, in operation:
generates a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component;
sets the first coefficient value to zero in response to the first coefficient value being less than 64;
generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generates a third coefficient value by adding the first coefficient value to the second coefficient value;
encodes a third reconstructed image sample of the chroma component using the third coefficient value;
determines a first parameter having the same value for Cb component and Cr component of the chroma component;
determines, using the first parameter, a model of entropy coding from a plurality of models; and
performs, using the model, the entropy coding of a second parameter of the CCALF process.

### Claim 2

An encoding apparatus, comprising:
a block splitter, which, in operation, splits a first image into a plurality of blocks;
an intra predictor, which, in operation, predicts blocks included in the first image, using reference blocks included in the first image;
an inter predictor, which, in operation, predicts blocks included in the first image, using reference blocks included in a second image different from the first image;
a loop filter, which, in operation, filters blocks included in the first image;
a transformer, which, in operation, transforms a prediction error between an original signal and a prediction signal generated by the intra predictor or the inter predictor, to generate transform coefficients;
a quantizer, which, in operation, quantizes the transform coefficients to generate quantized coefficients; and
an entropy encoder, which, in operation, variably encodes the quantized coefficients to generate an encoded bitstream including the encoded quantized coefficients and control information,
wherein the loop filter performs:
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generating a third coefficient value by adding the first coefficient value to the second coefficient value; and
encoding a third reconstructed image sample of the chroma component using the third coefficient value,
wherein the entropy encoder performs:
determining a first parameter having the same value for Cb component and Cr component of the chroma component;
determining, using the first parameter, a model of entropy coding from a plurality of models; and
entropy coding, using the model, a second parameter of the CCALF process.

### Claim 3

A decoder, comprising:
circuitry; and
memory coupled to the circuitry;
wherein the circuitry, in operation:
determines a first parameter having the same value for Cb component and Cr component of a chroma component;
determines, using the first parameter, a model of entropy coding from a plurality of models;
performs, using the model, entropy decoding of a second parameter of a CCALF (cross component adaptive loop filtering) process;
generates a first coefficient value by applying the CCALF process to a first reconstructed image sample of a luma component;
sets the first coefficient value to zero in response to the first coefficient value being less than 64;
generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of the chroma component;
generates a third coefficient value by adding the first coefficient value to the second coefficient value; and
decodes a third reconstructed image sample of the chroma component using the third coefficient value.

### Claim 4

A decoding apparatus, comprising:
a decoder, which, in operation, decodes an encoded bitstream to output quantized coefficients;
an inverse quantizer, which, in operation, inverse quantizes the quantized coefficients to output transform coefficients;
an inverse transformer, which, in operation, inverse transforms the transform coefficients to output a prediction error;
an intra predictor, which, in operation, predicts blocks included in a first image, using a reference blocks included in the first image;
an inter predictor, which, in operation, predicts blocks included in the first image, using reference blocks included in a second image different from the first image;
a loop filter, which, in operation, filters blocks included in the first image; and
an output, which, in operation, outputs a picture including the first image,
wherein the decoder performs:
determining a first parameter having the same value for Cb component and Cr component of a chroma component;
determining, using the first parameter, a model of entropy coding from a plurality of models; and
entropy decoding, using the model, a second parameter of a CCALF (cross component adaptive loop filtering) process,
wherein the loop filter performs:
generating a first coefficient value by applying the CCALF process to a first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of the chroma component;
generating a third coefficient value by adding the first coefficient value to the second coefficient value; and
decoding a third reconstructed image sample of the chroma component using the third coefficient value.

### Claim 5

An encoding method, comprising:
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generating a third coefficient value by adding the first coefficient value to the second coefficient value;
encoding a third reconstructed image sample of the chroma component using the third coefficient value;
determining a first parameter having the same value for Cb component and Cr component of the chroma component;
determining, using the first parameter, a model of entropy coding from a plurality of models; and
entropy coding, using the model, a second parameter of the CCALF.

### Claim 6

A decoding method, comprising:
determining a first parameter having the same value for Cb component and Cr component of a chroma component;
determining, using the first parameter, a model of entropy coding from a plurality of models;
entropy decoding, using the model, a second parameter of a CCALF (cross component adaptive loop filtering) process;
generating a first coefficient value by applying a CCALF process to a first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of the chroma component;
generating a third coefficient value by adding the first coefficient value to the second coefficient value; and
decoding a third reconstructed image sample of the chroma component using the third coefficient value.