US 11,818,394 B2
Sphere projected motion estimation/compensation and mode decision
Jae Hoon Kim, San Jose, CA (US); Xiaosong Zhou, Campbell, CA (US); Dazhong Zhang, Milpitas, CA (US); Hang Yuan, San Jose, CA (US); Jiefu Zhai, San Jose, CA (US); Chris Y. Chung, Sunnyvale, CA (US); and Hsi-Jung Wu, San Jose, CA (US)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Mar. 19, 2021, as Appl. No. 17/207,267.
Application 17/207,267 is a continuation of application No. 15/390,202, filed on Dec. 23, 2016, granted, now 10,999,602.
Prior Publication US 2021/0321133 A1, Oct. 14, 2021
Int. Cl. H04N 19/176 (2014.01); H04N 19/105 (2014.01); H04N 19/597 (2014.01); H04N 19/547 (2014.01)
CPC H04N 19/597 (2014.11) [H04N 19/105 (2014.11); H04N 19/176 (2014.11); H04N 19/547 (2014.11)] 21 Claims
OG exemplary drawing
 
1. A video decoding method, comprising:
decoding a reference frame in a source-domain from a coded video sequence;
decoding a spherical-domain motion vector for a pixel block of a current frame from the coded video sequence, the motion vector indicates a change in radii between a first radius of a first spherical domain projection of the reference frame and a second radius of a second spherical domain projection of the current frame, wherein the first radius and second radius are not the same;
transforming the reference frame from the source-domain to a spherical-domain;
generate a spherical-domain prediction of the pixel block from the transformed spherical-domain reference frame and the spherical-domain motion vector, the generating based on the change in the radius of the spherical-domain projection;
transforming the spherical-domain prediction into a source-domain prediction of the pixel block; and
generating a decoded current frame in the source-domain based on the source-domain prediction of the pixel block.