US 12,132,887 B2
Video decoding apparatus, video coding apparatus, video decoding method, and video coding method
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)
Appl. No. 17/914,809
Filed by Sharp Kabushiki Kaisha, Sakai (JP)
PCT Filed Mar. 26, 2021, PCT No. PCT/JP2021/012759
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/200610, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-062318 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0143900 A1, May 11, 2023
Int. Cl. H04N 19/105 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/70 (2014.11)] 6 Claims
OG exemplary drawing
 
1. A video decoding apparatus for deriving a prediction image by using a reference picture in a reference picture list, the video decoding apparatus comprising:
parameter decoding circuitry that decodes:
(i) a reference picture list structure in a sequence parameter set,
(ii) a first flag specifying whether first reference picture list information is present in a slice header whose nal_unit_type indicates an Instantaneous Decoding Refresh picture, wherein the first flag is included in the sequence parameter set,
(iii) a first syntax element specifying a number of the reference picture list structure, wherein the first syntax element is included in the sequence parameter set,
(iv) a second syntax element specifying a number of entries in the reference picture list structure, wherein the second syntax element is included in the reference picture list structure, and
(v) a second flag specifying whether second reference picture list information is present in a picture header, wherein the second flag is included in a picture parameter set; and
prediction parameter derivation circuitry that derives:
(i) one of the first reference picture list information in the slice header by using (a) the nal_unit_type or the first flag and (b) the second flag, and the second reference picture list information in a picture header by using the second flag, and
(ii) a reference picture list based on the reference picture list structure,
wherein
in a case that the nal_unit_type indicates the Instantaneous Decoding Refresh picture, a value of the second syntax element indicated by the first syntax element is set equal to 0.