US 12,267,506 B2
Smoothed directional and DC intra prediction
Mei Guo, San Jose, CA (US); Jun Xin, San Jose, CA (US); Hsi-Jung Wu, San Jose, CA (US); Alexandros Tourapis, Los Gatos, CA (US); and Krishnakanth Rapaka, San Jose, CA (US)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 10, 2022, as Appl. No. 17/837,846.
Application 17/837,846 is a division of application No. 16/834,693, filed on Mar. 30, 2020, granted, now 11,388,419.
Claims priority of provisional application 62/970,359, filed on Feb. 5, 2020.
Prior Publication US 2022/0303554 A1, Sep. 22, 2022
Int. Cl. H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/182 (2014.01)
CPC H04N 19/159 (2014.11) [H04N 19/176 (2014.11); H04N 19/182 (2014.11)] 21 Claims
OG exemplary drawing
 
1. An image coding method, comprising:
deriving a prediction pixel block for use in predictive coding in which:
a value for a first pixel location in the prediction pixel block is derived with a first technique from a blend of a predicted DC value of the prediction pixel block and at least one source pixel selected from a region of previously-decoded pixel data closest to the first pixel location, wherein the first pixel location is less than a threshold distance from the at least one source pixel, and the predicted DC value of the prediction pixel block is based on a DC value of a previously decoded rectangular pixel block and a value for a second pixel location in the prediction pixel block greater than the threshold distance from the at least one source pixel is derived with an alternate technique different from the first technique; and
coding an input pixel block differentially with reference to the prediction pixel block.