US 12,120,320 B2
Method for adaptively setting resolution, and image decoding apparatus
Jae Il Kim, Seoul (KR); Sun Young Lee, Seoul (KR); Kyung Hwan Ko, Seoul (KR); A Ram Baek, Sejong-si (KR); Se Hoon Son, Seoul (KR); Jae Seob Shin, Seoul (KR); and Tae Young Na, Seoul (KR)
Assigned to SK TELECOM CO., LTD., Seoul (KR)
Appl. No. 17/623,416
Filed by SK TELECOM CO., LTD., Seoul (KR)
PCT Filed Jun. 26, 2020, PCT No. PCT/KR2020/008342
§ 371(c)(1), (2) Date Dec. 28, 2021,
PCT Pub. No. WO2020/263009, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 10-2019-0078364 (KR), filed on Jun. 28, 2019; and application No. 10-2019-0155654 (KR), filed on Nov. 28, 2019.
Prior Publication US 2022/0353516 A1, Nov. 3, 2022
Int. Cl. H04N 19/172 (2014.01); H04N 19/105 (2014.01); H04N 19/139 (2014.01); H04N 19/146 (2014.01); H04N 19/30 (2014.01)
CPC H04N 19/172 (2014.11) [H04N 19/105 (2014.11); H04N 19/139 (2014.11); H04N 19/146 (2014.11); H04N 19/30 (2014.11)] 5 Claims
OG exemplary drawing
 
1. A method of decoding a video sequence of pictures by adaptively setting a picture resolution, the method comprising:
decoding, from a sequence parameter set (SPS) referred by all of the pictures belonging to the video sequence, a flag indicating whether it is allowed that at least one picture of the sequence has a different size than a reference picture referred by the at least one picture;
decoding maximum resolution information from the sequence parameter set, wherein the maximum resolution information specifies a maximum size of each decoded picture referring to the SPS;
decoding resolution information for a current picture from a picture parameter set which is a lower level than the sequence parameter set,
wherein the picture parameter set is a parameter set referred by one or more pictures belonging to the video sequence, and
wherein the resolution information for the current picture specifies a size of the current picture which are less than or equal to the maximum size, and includes a first syntax element specifying a width of the current picture and a second syntax element specifying a height of the current picture;
for decoding a current block within the current picture in an inter-prediction, comparing the size of the current picture with a size of a reference picture to be referenced by the current block;
determining a motion vector of the current block;
based on the size of the current picture and the size of the reference picture, resampling a sample location in the reference picture indicated by the motion vector and resampling sample locations in a reference block which is positioned at the sample location in the reference picture; and
predicting the current block using samples which correspond to the sample locations in the reference picture.