US 11,659,187 B2
Method for determining prediction direction, decoder, and computer storage medium
Junyan Huo, Dongguan (CN); Yanzhuo Ma, Dongguan (CN); Jianglin Wang, Dongguan (CN); Shuai Wan, Dongguan (CN); and Fuzheng Yang, Dongguan (CN)
Assigned to GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed by GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed on Apr. 6, 2022, as Appl. No. 17/714,881.
Application 17/714,881 is a continuation of application No. 17/366,787, filed on Jul. 2, 2021, granted, now 11,343,508.
Application 17/366,787 is a continuation of application No. PCT/CN2019/070145, filed on Jan. 2, 2019.
Prior Publication US 2022/0232220 A1, Jul. 21, 2022
Int. Cl. H04N 19/137 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/137 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 4 Claims
OG exemplary drawing
 
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
in response to that a sum value of M and N is larger than or equal to K2 and a difference value between the M and N is smaller than or equal to K1, determining that an index value of prediction direction of a DM derived mode is the K1 and the K2 respectively,
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 of the DM, and K2 is a maximum value of the index values of the prediction directions of the DM, and
wherein the DM derived mode is set after a Cross-Component Linear Model Prediction (CCLM) mode is set.