US 12,219,125 B2
Constrained motion vector derivation for long-term reference pictures in video coding
Yi-Wen Chen, San Diego, CA (US); Xiaoyu Xiu, San Diego, CA (US); Xianglin Wang, San Diego, CA (US); and Tsung-Chuan Ma, San Diego, CA (US)
Assigned to BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Aug. 13, 2021, as Appl. No. 17/402,466.
Application 17/402,466 is a continuation of application No. PCT/US2020/018918, filed on Feb. 19, 2020.
Claims priority of provisional application 62/808,271, filed on Feb. 20, 2019.
Prior Publication US 2021/0377520 A1, Dec. 2, 2021
Int. Cl. H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/513 (2014.01); H04N 19/577 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/513 (2014.11); H04N 19/577 (2014.11)] 9 Claims
OG exemplary drawing
 
1. A method for video decoding, comprising:
determining whether one or more of a plurality of reference pictures associated with an inter-mode coded block involved in an operation of an inter-mode coding tool are long-term reference pictures; and
prohibiting the performance of the inter-mode coding tool on the inter-mode coded block based on the determining that one of two reference pictures of the inter-mode coded block is a long-term reference picture and the other is not a long-term reference picture,
wherein the inter-mode coding tool comprises one of bi-directional optical flow (BDOF) process or decoder-side motion vector refinement (DMVR) process, and wherein the inter-mode coded block is a bi-directional prediction block.