Image component prediction method and device, and computer storage medium

Patent metadata

Field	Value
Publication number	US-12537939-B2
Application number	US-202418622202-A
Country	US
Kind code	B2
Filing date	Mar 29, 2024
Priority date	Jun 25, 2019
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

Colour component prediction method is provided, which includes that: first reference sample set corresponding to colour component to be predicted of coding block in video image is acquired; when available sample number in first reference sample set is less than preset number, preset component value is taken as predicted value corresponding to the colour component to be predicted; when available sample number in first reference sample set is not less than preset number, first reference sample set is screened to obtain second reference sample set; when available sample number in second reference sample set is equal to preset number, model parameter is determined through second reference sample set, and prediction model corresponding to colour component to be predicted is obtained based on model parameter, prediction model is used for prediction processing of colour component to be predicted to obtain predicted value corresponding to colour component to be predicted.

First claim

The invention claimed is:

1 . A method for a colour component prediction, applied to decoder, comprising:
determining a first reference sample set corresponding to a colour component to be predicted of a coding block in a video picture; when a number of available samples in the first reference sample set is equal to 0, taking a preset component value as a prediction value corresponding to the colour component to be predicted; and when the number of the available samples in the first reference sample set is greater than or equal to 4, obtaining a second reference sample set based on the first reference sample set:
when a number of available samples in the second reference sample set is equal to 2, taking the preset component value as the prediction value corresponding to the colour component to be predicted; and
when the number of available samples in the second reference sample set is equal to 4, determining a model parameter of a prediction model according to the second reference sample set, wherein the prediction model is used to implement a prediction processing of the colour component to be predicted to obtain a prediction value corresponding to the colour component to be predicted.

2 . The method of claim 1 ,
wherein the determining the first reference sample set corresponding to the colour component to be predicted of the coding block in the video picture comprises: acquiring reference samples neighboring at least one side of the coding block, wherein the at least one side comprises at least one of a left side of the coding block or a top side of the coding block; and determining the first reference sample set corresponding to the colour component to be predicted based on the reference samples.

3 . The method of claim 1 , wherein the determining the first reference sample set corresponding to the colour component to be predicted of the coding block in the video picture comprises:
acquiring reference samples in at least one of a reference row or a reference column neighboring the coding block, wherein the reference row comprises a row neighboring a top side and a top-right side of the coding block, and the reference column comprises a column neighboring a left side and a bottom-left side of the coding block; and determining the first reference sample set corresponding to the colour component to be predicted based on the reference samples.

4 . The method of claim 1 , wherein obtaining the second reference sample set based on the first reference sample set comprises:
determining positions of samples to be selected based on at least one of sample positions or colour component strength corresponding to neighbouring reference samples in the first reference sample set; and determining, from the first reference sample set, available samples corresponding to the positions of the samples to be selected according to the determined positions of the samples to be selected, and determining the second reference sample set based on the determined available samples, wherein the number of the available samples in the second reference sample set is less than or equal to 4.

5 . The method of claim 1 , wherein the taking the preset component value as the prediction value corresponding to the colour component to be predicted comprises:
determining the preset component value based on a bit depth of the video picture; wherein the preset component value is 1<<(BitDepth−1), and the BitDepth is a bit depth of the colour component to be predicted.

6 . The method of claim 1 , wherein the method further comprises:
for each sample in the coding block, performing prediction value filling on the colour component to be predicted of each sample by using the preset component value.

7 . The method of claim 1 , wherein after obtaining the prediction model corresponding to the colour component to be predicted according to the model parameter, the method further comprises:
performing a prediction processing on the colour component to be predicted of each sample in the coding block based on the prediction model, to obtain a prediction value corresponding to a colour component to be predicted of each sample.

8 . A method for a colour component prediction, applied to encoder, comprising:
determining a first reference sample set corresponding to a colour component to be predicted of a coding block in a video picture; when a number of available samples in the first reference sample set is equal to 0, taking a preset component value as a prediction value corresponding to the colour component to be predicted; and when the number of the available samples in the first reference sample set is greater than or equal to 4, obtaining a second reference sample set based on the first reference sample set:
when a number of available samples in the second reference sample set is equal to 2, taking the preset component value as the prediction value corresponding to the colour component to be predicted; and
when the number of available samples in the second reference sample set is equal to 4, determining a model parameter of a prediction model according to the second reference sample set, wherein the prediction model is used to implement a prediction processing of the colour component to be predicted to obtain a prediction value corresponding to the colour component to be predicted.

9 . The method of claim 8 ,
wherein the determining the first reference sample set corresponding to the colour component to be predicted of the coding block in the video picture comprises: acquiring reference samples neighboring at least one side of the coding block, wherein the at least one side comprises at least one of a left side of the coding block or a top side of the coding block; and determining the first reference sample set corresponding to the colour component to be predicted based on the reference samples.

10 . The method of claim 8 , wherein the determining the first reference sample set corresponding to the colour component to be predicted of the coding block in the video picture comprises:
acquiring reference samples in at least one of a reference row or a reference column neighboring the coding block, wherein the reference row comprises a row neighboring a top side and a top-right side of the coding block, and the reference column comprises a column neighboring a left side and a bottom-left side of the coding block; and determining the first reference sample set corresponding to the colour component to be predicted based on the reference samples.

11 . The method of claim 8 , wherein obtaining the second reference sample set based on the first reference sample set comprises:
determining positions of samples to be selected based on at least one of sample positions or colour component strength corresponding to neighbouring reference samples in the first reference sample set; and determining, from the first reference sample set, available samples corresponding to the positions of the samples to be selected according to the determined positions of the samples to be selected, and determining the second reference sample set based on the determined available samples, wherein the number of the available samples in the second reference sample set is less than or equal to 4.

12 . The method of claim 8 , wherein the taking the preset component value as the prediction value corresponding to the colour component to be predicted comprises:
determining the preset component value based on a bit depth of the video picture; wherein the preset component value is 1<<(BitDepth−1), and the BitDepth is a bit depth of the colour component to be predicted.

13 . The method of

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Huo Junyan
• Ma Yanzhuo
• Wan Shuai
• Yang Fuzheng
• Li Xinwei
• Ran Qihong

Classifications

• H04N19/186 Primary

  the unit being a colour or a chrominance component · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/105 Primary

  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 · CPC title

• H04N19/137

  Motion inside a coding unit, e.g. average field, frame or block difference · CPC title

• H04N19/184

  the unit being bits, e.g. of the compressed video stream · CPC title