# US 2020/0288122 A1 · Intra prediction encoding/decoding method and apparatus for chrominance components

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- Number: US 2020/0288122 A1
- Document ID: US20200288122A1
- Status: Published application
- Kind: A1
- Application number: 16/880,788
- Filed: 2020-05-21
- Published: 2020-09-10
- Earliest claimed: 2018-01-15
- Assignees: B1 Institute of Image Technology, Inc.
- Inventors: Ki Baek KIM
- Web page: https://patentgrep.com/patent/US20200288122A1

## CPC

- H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635)
- H04N 19/124: Quantisation
- H04N 19/129: Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/593: involving spatial prediction techniques
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Disclosed is an image decoding method using the correlation between color components to perform into prediction of chrominance components. Here, the image decoding method using the correlation between color components to perform intra prediction of chrominance components comprises the steps of: checking image data and a prediction mode in a bitstream; generating a prediction block according to a reconstructed prediction mode; determining compensation settings according to the size of a current block and the reconstructed prediction mode; compensating the prediction block according to the determined compensation settings; and reconstructing the current block by adding reconstructed image data to the prediction block.

## Claims

### Claim 1

A method of decoding an image with a decoding apparatus, comprising:
generating a prediction pixel of a current block of a first color space, the prediction pixel of the current block being generated by using one or more reference pixels belonging to a corresponding block of a second color space;
deriving correlation information between the current block of the first color space and the corresponding block of the second color space, using a first neighboring region adjacent to the current block of the first color space and a second neighboring region adjacent to the corresponding block of the second color space;
correcting the prediction pixel of the current block based on the correlation information; and
reconstructing the current block of the first color space based on the corrected prediction pixel.

### Claim 2 (depends on 1)

The method of claim 1, wherein generating the prediction pixel of the current block of the first color space comprises performing a filtering on said one or more reference pixels belonging to the corresponding block of the second color space.

### Claim 3 (depends on 2)

The method of claim 2, wherein said one or more reference pixels include at least one of a filtering target pixel or a neighboring pixel of the filtering target pixel, and
wherein the neighboring pixel of the filtering target pixel includes at least one of a top pixel, a left pixel, a right pixel, a top-left pixel, a top-right pixel, a bottom-left pixel or a bottom-right pixel of the filtering target pixel.

### Claim 4 (depends on 3)

The method of claim 3, wherein a number of the reference pixels to be used to generate the prediction pixel of the current block of the first color space is variably determined based on a flag signaled from an encoding apparatus.

### Claim 5 (depends on 1)

The method of claim 1, wherein a position of each of the first neighboring region and the second neighboring region is determined based on an intra prediction mode of the current block of the first color space.

### Claim 6 (depends on 5)

The method of claim 5, wherein the first neighboring region includes at least one of a top region, a left region, a top-left region, a bottom-left region or a top-right region of the current block of the first color space.

### Claim 7 (depends on 1)

The method of claim 1, wherein deriving the correlation information comprises:
determining a plurality of pixels for correcting the prediction pixel of the current block, among pixels belonging to the second neighboring region adjacent to the corresponding block of the second color space; and
generating one pixel by applying a weighting filter to the determined plurality of pixels.

### Claim 8

A method of encoding an image with an encoding apparatus, comprising:
generating a prediction pixel of a current block of a first color space, the prediction pixel of the current block being generated by using one or more reference pixels belonging to a corresponding block of a second color space;
deriving correlation information between the current block of the first color space and the corresponding block of the second color space, using a first neighboring region adjacent to the current block of the first color space and a second neighboring region adjacent to the corresponding block of the second color space;
correcting the prediction pixel of the current block based on the correlation information; and
encoding the current block of the first color space based on the corrected prediction pixel.

### Claim 9

A non-transitory computer-readable storage medium having instructions stored thereon that, when executed, cause one or more processors to:
generating a prediction pixel of a current block of a first color space, the prediction pixel of the current block being generated by using one or more reference pixels belonging to a corresponding block of a second color space;
deriving correlation information between the current block of the first color space and the corresponding block of the second color space, using a first neighboring region adjacent to the current block of the first color space and a second neighboring region adjacent to the corresponding block of the second color space;
correcting the prediction pixel of the current block based on the correlation information; and
reconstructing the current block of the first color space based on the corrected prediction pixel.