Method for determining prediction direction, decoder, and computer storage medium

Patent metadata

Field	Value
Publication number	US-12470719-B2
Application number	US-202418762640-A
Country	US
Kind code	B2
Filing date	Jul 3, 2024
Priority date	Jan 2, 2019
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

Provided are a method for determining a prediction direction, a decoder and a computer storage medium. The method is implemented by a decoder. The method includes that: a Direct Mode (DM) in a chroma intra prediction mode of a block to be decoded is acquired (S 101 ); and an index number of a prediction direction in a DM derived mode is determined based on an offset N and an index number M of a prediction direction in the DM to determine the DM derived mode (S 102 ).

First claim

The invention claimed is:

1 . A method for determining a prediction direction, implemented by a decoder and comprising:
determining a chroma intra prediction mode of a block to be decoded; acquiring a Direct Mode (DM) in the chroma intra prediction mode; and determining an index number of the prediction direction in a DM derived mode based on M, N, K1 and K2 to determine the DM derived mode, wherein the N is an offset, the M is an index value of prediction direction of the DM, the K1 is a minimum value of index values of prediction directions in the DM and the K2 is a maximum value of the index values of the prediction directions in the DM, and wherein decoding of a Cross-Component Linear Model Prediction (CCLM) is prior to decoding of the DM derived mode.

2 . A method for determining a prediction direction, implemented by an encoder and comprising:
determining a chroma intra prediction mode of an encoding block; acquiring a Direct Mode (DM) in the chroma intra prediction mode; and determining an index number of the prediction direction in a DM derived mode based on M, N, K1 and K2 to determine the DM derived mode; wherein the N is an offset, the M is an index value of prediction direction of the DM, the K1 is a minimum value of index values of prediction directions in the DM and the K2 is a maximum value of the index values of the prediction directions in the DM, and wherein encoding of a Cross-Component Linear Model Prediction (CCLM) is decoded prior to encoding of the DM derived mode.

3 . A decoder, comprising:
a processor; and a storage medium storing instructions executable by the processor, wherein the storage medium is configured to communicate with the processor through a communication bus to execute an operation, and the instructions are executed by the processor to implement a method for determining a prediction direction, the method comprising: determining a chroma intra prediction mode of a block to be decoded; acquiring a Direct Mode (DM) in the chroma intra prediction mode; and determining an index number of the prediction direction in a DM derived mode based on M, N, K1 and K2 to determine the DM derived mode; wherein the N is an offset, the M is an index value of prediction direction of the DM, the K1 is a minimum value of index values of prediction directions in the DM and the K2 is a maximum value of the index values of the prediction directions in the DM, and wherein decoding of a Cross-Component Linear Model Prediction (CCLM) is decoded prior to decoding of the DM derived mode.

4 . An encoder, comprising:
a processor; and a storage medium storing instructions executable by the processor, wherein the storage medium is configured to communicate with the processor through a communication bus to execute an operation, and the instructions are executed by the processor to implement a method for determining a prediction direction, the method comprising: determining a chroma intra prediction mode of an encoding block; acquiring a Direct Mode (DM) in the chroma intra prediction mode; and determining an index number of the prediction direction in a DM derived mode based on M, N, K1 and K2 to determine the DM derived mode; wherein the N is an offset, the M is an index value of prediction direction of the DM, the K1 is a minimum value of index values of prediction directions in the DM and the K2 is a maximum value of the index values of the prediction directions in the DM, and wherein encoding of a Cross-Component Linear Model Prediction (CCLM) is decoded prior to encoding of the DM derived mode.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

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

Classifications

• H04R2410/07

  Mechanical or electrical reduction of wind noise generated by wind passing a microphone · CPC title

• H04R1/2884

  by means of the enclosure structure, i.e. strengthening or shape of the enclosure · CPC title

• H04R1/222

  for microphones (H04R1/24, H04R1/26 take precedence) · CPC title

• G06F16/9017

  using directory or table look-up (use of a directory or look-up table in file systems G06F16/13) · CPC title

• H04N19/186

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