US 11,659,161 B2
Reference frame obtaining method and apparatus applied to bidirectional inter prediction
Huanbang Chen, Shenzhen (CN); and Haitao Yang, Shenzhen (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Mar. 2, 2021, as Appl. No. 17/189,577.
Application 17/189,577 is a continuation of application No. PCT/CN2019/094106, filed on Jun. 30, 2019.
Claims priority of provisional application 62/734,226, filed on Sep. 20, 2018.
Claims priority of provisional application 62/727,534, filed on Sep. 5, 2018.
Claims priority of provisional application 62/726,975, filed on Sep. 4, 2018.
Prior Publication US 2021/0185310 A1, Jun. 17, 2021
Int. Cl. H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/172 (2014.01); H04N 19/176 (2014.01); H04N 19/137 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/137 (2014.11); H04N 19/159 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11)] 21 Claims
OG exemplary drawing
 
1. A method for obtaining a bidirectional inter-prediction reference frame, comprising:
determining a first reference frame list of a current picture block and a second reference frame list of the current picture block;
determining, from the first reference frame list, whether a first X-directional reference frame that satisfies a first condition exists, wherein the first condition is that a first reference frame that is closest to a current frame has a first sequence number that is less than a second sequence number of the current frame, and wherein the current frame includes the current picture block; and
determining, from the second reference frame list, whether a first Y-directional reference frame that satisfies a second condition exists, wherein the second condition is that a second reference frame that is closest to the current frame has a third sequence number that is greater than the second sequence number, wherein based on the first X-directional reference frame existing and the first Y-directional reference frame existing, the method further comprises:
determining, from the first reference frame list, whether a second X-directional reference frame that satisfies a third condition exists;
determining, from the second reference frame list, whether a second Y-directional reference frame that satisfies a fourth condition exists; and
obtaining a plurality of index values of bidirectional reference frames of the current picture block based on the first X-directional reference frame existing, the second X-directional reference frame not existing, the first Y-directional reference frame existing, and the second Y-directional reference frame existing, wherein the index values are respectively set to a first index value of the first X-directional reference frame and a second index value of the first Y-directional reference frame.