Granted Patent B2

US 12,470,719 · App. 18/762,640 · Granted Nov 11, 2025

Inventors: Junyan Huo (Guangdong, CN); Yanzhuo Ma (Guangdong, CN); Jianglin Wang (Guangdong, CN); Shuai Wan (Guangdong, CN); Fuzheng Yang (Guangdong, CN)

Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

H04N19/137H04N19/159H04N19/176H04N19/186

Abstract

Claims (30)

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.

Assignments (1)

Continuity (5)

References Cited (60)