US 11,909,965 B2
Method and apparatus for non-linear adaptive loop filtering in video coding
Chen-Yen Lai, Hsinchu (TW); Ching-Yeh Chen, Hsinchu (TW); Tzu-Der Chuang, Hsinchu (TW); and Yu-Wen Huang, Hsinchu (TW)
Assigned to HFI INNOVATION INC., Zhubei (TW)
Filed by HFI Innovation Inc., Zhubei (TW)
Filed on Aug. 12, 2022, as Appl. No. 17/819,362.
Application 17/819,362 is a continuation of application No. 17/424,656, previously published as PCT/CN2020/073567, filed on Jan. 21, 2020.
Claims priority of provisional application 62/832,349, filed on Apr. 11, 2019.
Claims priority of provisional application 62/796,608, filed on Jan. 25, 2019.
Prior Publication US 2022/0394246 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/117 (2014.01); H04N 19/82 (2014.01); H04N 19/176 (2014.01); H04N 19/159 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/159 (2014.11); H04N 19/82 (2014.11); H04N 19/176 (2014.11)] 8 Claims
OG exemplary drawing
 
1. A method for Adaptive Loop Filter (ALF) processing of reconstructed video, the method comprising:
receiving reconstructed pixels, wherein the reconstructed pixels comprise a current block;
determining one or more clipping values for the ALF processing, wherein a target clipping value is always signaled at an encoder side or parsed at a decoder side even if the target clipping value is zero;
deriving a current ALF output for the current block, wherein the current ALF output comprises a weighted sum of clipped differences of original differences and each of the original differences is calculated between a first reconstructed pixel at a non-center filter location and a center reconstructed pixel at a center filter location, and wherein each of the original differences is clipped according to a corresponding clipping value to form one clipped difference; and
providing filtered-reconstructed pixels, wherein the filtered-reconstructed pixels comprise the current ALF output.