US 11,716,486 B2
Video decoding apparatus using parameter decoding circuit to derive weight coefficients
Takeshi Chujoh, Sakai (JP); Tomohiro Ikai, Sakai (JP); Tomoko Aono, Sakai (JP); Eiichi Sasaki, Sakai (JP); Tomonori Hashimoto, Sakai (JP); Tianyang Zhou, Sakai (JP); and Yukinobu Yasugi, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Feb. 25, 2022, as Appl. No. 17/681,615.
Application 17/681,615 is a continuation of application No. 17/201,627, filed on Mar. 15, 2021, granted, now 11,303,927.
Claims priority of application No. 2020-046124 (JP), filed on Mar. 17, 2020.
Prior Publication US 2022/0182660 A1, Jun. 9, 2022
Int. Cl. H04N 19/577 (2014.01); H04N 19/59 (2014.01); H04N 19/176 (2014.01); H04N 19/159 (2014.01); H04N 19/46 (2014.01); H04N 19/105 (2014.01)
CPC H04N 19/577 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/59 (2014.11)] 2 Claims
OG exemplary drawing
 
1. A video decoding apparatus comprising:
a parameter decoding circuit configured to decode a first flag indicating whether or not a weighted prediction information is present in a picture header, a second flag indicating whether or not a weighted prediction is applied to B slices, a first syntax element for deriving weight coefficients, and a second syntax element indicating a number of entries in at least reference picture list 1;
a prediction parameter derivation circuit configured to derive inter prediction parameters;
a motion compensation circuit configured to generate interpolation images based on the inter prediction parameters and a reference picture; and
a weighted prediction circuit configured to derive the weight coefficients by using the first syntax element and generate a prediction image by using the interpolation images and the weight coefficients,
wherein the parameter decoding circuit decodes a third syntax element indicating a number of weights signaled for entries in the reference picture list 1 based on the first flag and the second flag,
the weighted prediction circuit sets a variable NumWeightsL1 indicating the number of weights signaled for entries in the reference picture list 1 to be equal to 0 in a case that the third syntax element is not decoded, and
the weighted prediction circuit sets the weight coefficient for the reference picture list 1 to be an exponential value of the first syntax element of 2 in a case that the value of the variable NumWeightsL1 is equal to 0.