US 11,800,092 B2
Joint signaling method for motion vector difference
Liang Zhao, Sunnyvale, CA (US); Xin Zhao, San Jose, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on Mar. 22, 2022, as Appl. No. 17/700,729.
Claims priority of provisional application 63/289,140, filed on Dec. 14, 2021.
Claims priority of provisional application 63/280,506, filed on Nov. 17, 2021.
Prior Publication US 2023/0156182 A1, May 18, 2023
Int. Cl. H04N 19/105 (2014.01); H04N 19/139 (2014.01); H04N 19/513 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/139 (2014.11); H04N 19/176 (2014.11); H04N 19/521 (2014.11); H04N 19/70 (2014.11)] 17 Claims
OG exemplary drawing
 
1. A method for decoding an inter-predicted video block, the method comprising:
receiving, by a device comprising a memory storing instructions and a processor in communication with the memory, a coded video bitstream;
extracting, by the device from the coded video bitstream, a flag indicating whether an inter-predication mode is a JOINT_NEWMV mode for a current block in a current frame, wherein the JOINT_NEWMV mode indicates that a first delta motion vector (MV) for a first reference frame from a reference list 0 and a second delta MV for a second reference frame from a reference list 1 are jointly signaled, the inter-predication mode is configured as the JOINT_NEWMV mode in response to a direction relationship of the first reference frame and the second reference frame relative to the current frame indicating opposite direction, and a first picture order count (POC) distance between the first reference frame and the current frame being equal to a second POC distance between the second reference frame and the current frame;
in response to the flag indicating that the inter-predication mode is the JOINT_NEWMV mode:
extracting, by the device from the coded video bitstream, a joint delta MV for the current block, and
deriving, by the device, the first delta MV and the second delta MV based on the joint delta MV; and
decoding, by the device, the current block in the current frame based on the first delta MV and the second delta MV.