Intra prediction method and apparatus, and computer-readable storage medium

Patent metadata

Field	Value
Publication number	US-11350088-B2
Application number	US-202117356148-A
Country	US
Kind code	B2
Filing date	Jun 23, 2021
Priority date	Mar 12, 2019
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

Provided are an intra prediction method and apparatus, and a computer-readable storage medium. The method includes: acquiring a first reference sample set corresponding to the current processing block, wherein the first reference sample set includes at least one of a reference row adjacent to the current processing block and a reference column adjacent to the current processing block; selecting, based on a pre-set selection method, a second reference sample set from the first reference sample set, wherein the second reference sample set includes at least one reference sample in the reference row adjacent to the current processing block or the reference column adjacent to the current processing block; obtaining, based on the second reference sample set, a prediction value of the current processing block; and performing, based on the prediction value, intra prediction on the current processing block.

First claim

What is claimed is:

1. A video decoding method, comprising:
acquiring a first reference sample set corresponding to a current processing block, wherein the first reference sample set includes at least one of a reference row or a reference column adjacent to the current processing block;
selecting a second reference sample set from the first reference sample set based on a preset selection mode,
wherein when the preset selection mode is a preset sampling rate, selecting the second reference sample set comprises:
downsampling the reference row or the reference column in the first reference sample set according to the preset sampling rate to acquire a down-sampled reference sample; and
determining the down-sampled reference sample as the second reference sample set;

acquiring a prediction value of the current processing block based on the second reference sample set; and
performing intra prediction on the current processing block based on the prediction value.

2. The method of claim 1 , wherein, the preset selection mode comprises at least one of a preset position, blithe preset sampling rate, or a preset statistical characteristics.

3. The method of claim 2 , wherein when the preset selection mode is the preset position, selecting the second reference sample set from the first reference sample set based on the preset selection mode comprises:
determining a sub-reference sample at the preset position of a reference row or a reference column from the first reference sample set; and
determining the sub-reference sample as the second reference sample set.

4. The method of claim 2 , wherein when the preset selection mode is the preset statistical characteristics, selecting the second reference sample set from the first reference sample set based on the preset selection mode comprises:
selecting the second reference sample set from the reference row or the reference column in the first reference sample set according to the preset statistical characteristics.

5. The method of claim 1 , wherein when the second reference sample set comprises at least two reference samples, acquiring the prediction value of the current processing block based on the second reference sample set comprises:
averaging sample values of the at least two reference samples to acquire an average value; and
setting the prediction value of the current processing block equal to the average value.

6. The method of claim 1 , wherein when the second reference sample set comprises one reference sample, acquiring the prediction value of the current processing block based on the second reference sample set comprises:
determining a sample value of the reference sample as the prediction value of the current processing block.

7. The method of claim 2 , wherein, the preset position is a middle position of the reference row or the reference column.

8. The method of claim 2 , wherein, the preset sampling rate is one half.

9. A video decoding apparatus, comprising: a memory and a processor, wherein the memory stores a computer program which is runnable on the processor, and when the program is executed, the processor is configured to acquire a first reference sample set corresponding to a current processing block, wherein the first reference sample set includes at least one of a reference row or a reference column adjacent to the current processing block;
select a second reference sample set from the first reference sample set based on a preset selection mode,
wherein when the preset selection mode is a preset sampling rate, selecting the second reference sample set comprises:
downsampling the reference row or the reference column in the first reference sample set according to the preset sampling rate to acquire a down-sampled reference sample; and
determining the down-sampled reference sample as the second reference sample set;

acquire a prediction value of the current processing block based on the second reference sample set; and
perform intra prediction on the current processing block based on the prediction value.

10. The apparatus of claim 9 , wherein the preset selection mode comprises at least one of a preset position, the preset sampling rate, or a preset statistical characteristics.

11. The apparatus of claim 10 , wherein when the preset selection mode is the preset position,
the processor is configured to determine a sub-reference sample at the preset position of a reference row or a reference column from the first reference sample set; and
determine the sub-reference sample as the second reference sample set.

12. The apparatus of claim 10 , wherein when the preset selection mode is the preset statistical characteristics,
the processor is configured to select the second reference sample set from the reference row or the reference column in the first reference sample set according to the preset statistical characteristics.

13. The apparatus of claim 9 , wherein when the second reference sample set comprises at least two reference samples,
the processor is configured to average sample values of the at least two reference samples to acquire an average value; and set the prediction value of the current processing block equal to the average value.

14. The apparatus of claim 9 , wherein when the second reference sample set comprises one reference sample,
the processor is configured to determine a sample value of the reference sample as the prediction value of the current processing block.

15. The apparatus of claim 10 , wherein the preset position is a middle position of the reference row or the reference column.

16. The apparatus of claim 10 , wherein the preset sampling rate is one half.

17. A video encoding apparatus, comprising: a memory and a processor, wherein the memory stores a computer program which is runnable on the processor, and when the program is executed, the processor is configured to acquire a first reference sample set corresponding to a current processing block, wherein the first reference sample set includes at least one of a reference row or a reference column adjacent to the current processing block;
select a second reference sample set from the first reference sample set based on a preset selection mode,
wherein when the preset selection mode is a preset sampling rate, selecting the second reference sample set comprises:
downsampling the reference row or the reference column in the first reference sample set according to the preset sampling rate to acquire a down-sampled reference sample; and
determining the down-sampled reference sample as the second reference sample set;

acquire a prediction value of the current processing block based on the second reference sample set; and
perform intra prediction on the current processing block based on the prediction value.

18. A computer readable storage medium with a computer program stored thereon, wherein when the computer program is executed by a processor, the method of claim 1 is implemented.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Huo Junyan
• Wang Jianglin
• Ma Yanzhuo
• Wan Shuai
• Yang Fuzheng

Classifications

• 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

• H04N19/159

  Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction · CPC title

• H04N19/176

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

• H04N19/593 Primary

  involving spatial prediction techniques · CPC title

• H04N19/146

  Data rate or code amount at the encoder output · CPC title