Encoder, a decoder and corresponding methods of intra prediction

Patent metadata

Field	Value
Publication number	US-12088799-B2
Application number	US-202117369024-A
Country	US
Kind code	B2
Filing date	Jul 7, 2021
Priority date	Apr 27, 2019
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A method of coding implemented by a decoding device, comprising: setting a value of candidate intra prediction mode of a current block to be a default value, wherein the current block is predicted using an intra prediction mode but not a Matrix-based Intra Prediction (MIP) mode and a neighboring block adjacent to the current block is used to derive the value of candidate intra prediction mode of the current block and is predicted using MIP mode; obtaining a value of the intra prediction mode of the current block according to the default value.

First claim

The invention claimed is:

1. A method of coding implemented by a decoding device, comprising:
setting a value of candidate intra prediction mode of a current block to be a default value, wherein the current block is predicted using an intra prediction mode but not a Matrix-based Intra Prediction (MIP) mode and a neighboring block adjacent to the current block is used to derive the value of candidate intra prediction mode of the current block and is predicted using the MIP mode, the default value corresponding to a non-angular intra mode, wherein the MIP mode takes one line of reconstructed neighboring boundary samples left of the current block and one line of restricted neighboring boundary samples above the current block as input, wherein when performing chroma mode derivation, corresponded luma mode is set to a Planar mode; and
obtaining a value of the intra prediction mode of the current block according to the default value.

2. The method of claim 1 , wherein the default value of the candidate intra prediction mode of the current block is 0 or 1, wherein a value of 0 indicates the Planar mode and a value of 1 indicates a DC mode.

3. The method of claim 1 , wherein whether the current block is predicted using a MIP mode or not is indicated according to a value of a MIP indication information.

4. The method of claim 3 , wherein the MIP indication information is indicated by a flag intra_mip_flag.

5. A method of coding implemented by an encoding device, comprising:
setting a value of candidate intra prediction mode of a current block to be a default value, wherein the current block is predicted using an intra prediction mode but not a Matrix-based Intra Prediction (MIP) mode and a neighboring block adjacent to the current block is used to derive the value of candidate intra prediction mode of the current block and is predicted using the MIP mode, the default value corresponding to a non-angular intra mode, wherein the MIP mode takes one line of reconstructed neighboring boundary samples left of the current block and one line of restricted neighboring boundary samples above the current block as input, wherein when performing chroma mode derivation, corresponded luma mode is set to Planar mode; and
encoding a value of the intra prediction mode of the current block according to the default value.

6. The method of claim 5 , wherein the default value of the candidate intra prediction mode of the current block is 0 or 1, a value of 0 indicates the Planar mode and a value of 1 indicates a DC mode.

7. The method of claim 5 , wherein whether the current block is predicted using a MIP mode or not is indicated according to a value of a MIP indication information.

8. The method of claim 7 , wherein the MIP indication information is indicated by a flag intra_mip_flag.

9. A non-transitory computer-readable storage medium coupled to one or more processors and storing instructions for execution by the one or more processors, wherein the instructions, when executed by the one or more processors, configures a decoder to:
set a value of candidate intra prediction mode of a current block to be a default value, wherein the current block is predicted using an intra prediction mode but not a Matrix-based Intra Prediction (MIP) mode and a neighboring block adjacent to the current block is used to derive the value of candidate intra prediction mode of the current block and is predicted using the MIP mode, the default value corresponding to a non-angular intra mode, wherein the MIP mode takes one line of reconstructed neighboring boundary samples left of the current block and one line of restricted neighboring boundary samples above the current block as input, wherein when performing chroma mode derivation, corresponded luma mode is set to Planar mode; and
obtain a value of the intra prediction mode of the current block according to the default value.

10. The non-transitory computer-readable storage medium of claim 9 , wherein the default value of the candidate intra prediction mode of the current block is 0 or 1, a value of 0 indicates the Planar mode and a value of 1 indicates a DC mode.

11. The non-transitory computer-readable storage medium of claim 9 , wherein whether the current block is predicted using a MIP mode or not is indicated according to a value of a MIP indication information.

12. The non-transitory computer-readable storage medium of claim 11 , wherein the MIP indication information is indicated by a flag intra_mip_flag.

13. A decoder, comprising:
one or more processors; and
a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming for execution by the one or more processors, wherein the programming, when executed by the one or more processors, configures the decoder to carry out operations of:
setting a value of candidate intra prediction mode of a current block to be a default value, wherein the current block is predicted using an intra prediction mode but not a Matrix-based Intra Prediction (MIP) mode and a neighboring block adjacent to the current block is used to derive the value of candidate intra prediction mode of the current block and is predicted using the MIP mode, the default value corresponding to a non-angular intra mode, wherein the MIP mode takes one line of reconstructed neighboring boundary samples left of the current block and one line of restricted neighboring boundary samples above the current block as input, wherein when performing chroma mode derivation, corresponded luma mode is set to Planar mode; and
obtaining a value of the intra prediction mode of the current block according to the default value.

14. The decoder of claim 13 , wherein the default value of the candidate intra prediction mode of the current block is 0 or 1, a value of 0 indicates the Planar mode and a value of 1 indicates a DC mode.

15. The decoder of claim 13 , wherein whether the current block is predicted using a MIP mode or not is indicated according to a value of a MIP indication information.

16. The decoder of claim 15 , wherein the MIP indication information is indicated by a flag intra_mip_flag.

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Biao
• Esenlik Semih
• Kotra Anand Meher
• Gao Han
• Chen Jianle

Classifications

• H04N19/196

  being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters (processing of motion vectors H04N19/513) · CPC title

• H04N19/176

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

• H04N19/159

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

• H04N19/186

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

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title