# US 11,909,979 B2 · Method for colour component prediction, encoder, decoder and storage medium

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- Number: US 11,909,979 B2
- Document ID: US11909979B2
- Status: Granted
- Kind: B2
- Application number: 17/942,366
- Filed: 2022-09-12
- Published: 2023-01-19
- Granted: 2024-02-20
- Earliest claimed: 2019-07-10
- Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Inventors: Junyan Huo; Yanzhuo Ma; Wei Zhang
- Web page: https://patentgrep.com/patent/US11909979B2

## 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 19/132: Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
- G06F 5/01: for shifting, e.g. justifying, scaling, normalising {(digital stores in which the information is moved stepwise, e.g. shift-registers G11C19/00; digital stores in which the information circulates G11C21/00)}
- G06F 17/16: Matrix or vector computation {, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization (matrix transposition G06F7/78)}
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- 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 19/42: characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation (H04N19/635 takes precedence)
- H04N 19/59: involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
- H04N 19/593: involving spatial prediction techniques
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A method for colour component prediction, an encoder, a decoder and a storage medium are provided. The method includes that: prediction parameters of a current block are determined, the prediction parameters including a prediction mode parameter and a size parameter of the current block; when the prediction mode parameter indicates that a Matrix-based Intra Prediction (MIP) mode is adopted to determine an intra prediction value of the current block, an MIP weight matrix of the current block, a shift factor of the current block and an MIP input sample matrix of the current block are determined; and the intra prediction value of the current block is determined according to the MIP weight matrix, the shift factor and the MIP input sample matrix.

## Claims

### Claim 1

A method for colour component prediction, applicable for an encoder and comprising:
determining prediction parameters of a current block, the prediction parameters comprising a prediction mode parameter and a size parameter of the current block;
when the prediction mode parameter indicates that a Matrix-based Intra Prediction (MIP) mode is adopted to determine an intra prediction value of the current block, determining an MIP weight matrix of the current block, a shift factor of the current block and an MIP input sample matrix of the current block, wherein the shift factor corresponding to different prediction mode parameters and different size parameters is equal to a fixed constant value; and
determining the intra prediction value of the current block according to the MIP weight matrix, the shift factor and the MIP input sample matrix,
wherein the MIP weight matrix of the current block is at least determined according to a block size index value of the current block;
when both a width and a height of the current block are equal to 4, setting the block size index value of the current block equal to 0;
when both the width and height of the current block are equal to 8 or only one of the width and height of the current block is equal to 4, setting the block size index value of the current block equal to 1; or
when both the width and height of the current block do not meet the above conditions, setting the block size index value of the current block equal to 2.

### Claim 2 (depends on 1)

The method of claim 1, wherein determining the intra prediction value of the current block according to the MIP weight matrix, the shift factor and the MIP input sample matrix comprises:
performing matrix multiplication processing on the MIP input sample matrix, the MIP weight matrix and the shift factor by use of a preset calculation model to obtain an MIP-based prediction block of the current block; and
performing filtering processing on the MIP-based prediction block to obtain the intra prediction value of the current block, the MIP-based prediction block comprising prediction values of at least part of sample positions in the current block.

### Claim 3 (depends on 1)

The method of claim 1, wherein the shift factor is equal to 6.

### Claim 4

A method for colour component prediction, applicable for a decoder and comprising:
parsing a bitstream to acquire prediction parameters of a current block, the prediction parameters comprising a prediction mode parameter and a size parameter of the current block;
when the prediction mode parameter indicates that a Matrix-based Intra Prediction (MIP) mode is adopted to determine an intra prediction value of the current block, determining an MIP weight matrix of the current block, a shift factor of the current block and an MIP input sample matrix of the current block, wherein the shift factor corresponding to different prediction mode parameters and different size parameters is equal to a fixed constant value; and
determining the intra prediction value of the current block according to the MIP weight matrix, the shift factor and the MIP input sample matrix,
wherein the MIP weight matrix of the current block is determined at least according to a block size index value of the current block;
when both a width and a height of the current block are equal to 4, setting the block size index value of the current block equal to 0;
when both the width and height of the current block are equal to 8 or only one of the width and height of the current block is equal to 4, setting the block size index value of the current block equal to 1; or
when both the width and height of the current block do not meet the above conditions, setting the block size index value of the current block equal to 2.

### Claim 5 (depends on 4)

The method of claim 4, wherein determining the intra prediction value of the current block according to the MIP weight matrix, the shift factor and the MIP input sample matrix comprises:
performing matrix multiplication processing on the MIP input sample matrix, the MIP weight matrix and the shift factor by use of a preset calculation model to obtain an MIP-based prediction block of the current block; and
performing filtering processing on the MIP-based prediction block to obtain the intra prediction value of the current block, the MIP-based prediction block comprising predicted values of at least part of sample positions in the current block.

### Claim 6 (depends on 4)

The method of claim 4, wherein the shift factor is equal to 6.

### Claim 7

An encoder, comprising a memory and a processor, wherein
the memory is configured to store computer programs capable of running in the processor; and
the processor is configured to run the computer programs to:
determine prediction parameters of a current block, the prediction parameters comprising a prediction mode parameter and a size parameter of the current block;
when the prediction mode parameter indicates that a Matrix-based Intra Prediction (MIP) mode is adopted to determine an intra prediction value of the current block, determine an MIP weight matrix of the current block, a shift factor of the current block and an MIP input sample matrix of the current block, wherein the shift factor corresponding to different prediction mode parameters and different size parameters is equal to a fixed constant value; and
determine the intra prediction value of the current block according to the MIP weight matrix, the shift factor and the MIP input sample matrix,
wherein the MIP weight matrix of the current block is at least determined according to a block size index value of the current block;
set the block size index value of the current block equal to 0 when both a width and a height of the current block are equal to 4;
set the block size index value of the current block equal to 1 when both the width and height of the current block are equal to 8 or only one of the width and height of the current block is equal to 4; or
set the block size index value of the current block equal to 2 when both the width and height of the current block do not meet the above conditions.

### Claim 8 (depends on 7)

The encoder of claim 7, wherein the processor is further configured to run the computer programs to:
perform matrix multiplication processing on the MIP input sample matrix, the MIP weight matrix and the shift factor by use of a preset calculation model to obtain an MIP-based prediction block of the current block; and
perform filtering processing on the MIP-based prediction block to obtain the intra prediction value of the current block, the MIP-based prediction block comprising prediction values of at least part of sample positions in the current block.

### Claim 9 (depends on 7)

The encoder of claim 7, wherein the shift factor is equal to 6.

### Claim 10

A decoder, comprising a memory and a processor, wherein
the memory is configured to store computer programs capable of running in the processor; and
the processor is configured to run the computer programs to:
parse a bitstream to acquire prediction parameters of a current block, the prediction parameters comprising a prediction mode parameter and a size parameter of the current block;
when the prediction mode parameter indicates that a Matrix-based Intra Prediction (MIP) mode is adopted to determine an intra prediction value of the current block, determine an MIP weight matrix of the current block, a shift factor of the current block and an MIP input sample matrix of the current block, wherein the shift factor corresponding to different prediction mode parameters and different size parameters is equal to a fixed constant value; and
determine the intra prediction value of the current block according to the MIP weight matrix, the shift factor and the MIP input sample matrix,
wherein the MIP weight matrix of the current block is determined at least according to a block size index value of the current block;
set the block size index value of the current block equal to 0 when both a width and a height of the current block are equal to 4;
set the block size index value of the current block equal to 1 when both the width and height of the current block are equal to 8 or only one of the width and height of the current block is equal to 4; or
set the block size index value of the current block equal to 2 when both the width and height of the current block do not meet the above conditions.

### Claim 11 (depends on 10)

The decoder of claim 10, wherein the processor is further configured to run the computer programs to:
perform matrix multiplication processing on the MIP input sample matrix, the MIP weight matrix and the shift factor by use of a preset calculation model to obtain an MIP-based prediction block of the current block; and
perform filtering processing on the MIP-based prediction block to obtain the intra prediction value of the current block, the MIP-based prediction block comprising predicted values of at least part of sample positions in the current block.

### Claim 12 (depends on 10)

The decoder of claim 10, wherein the shift factor is equal to 6.