US 12,010,298 B2
Model parameter derivation of local illumination compensation in the luma mapping with chroma scaling-mapped domain in video coding
Chun-Chi Chen, San Diego, CA (US); Han Huang, San Diego, CA (US); Vadim Seregin, San Diego, CA (US); and Marta Karczewicz, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on May 30, 2023, as Appl. No. 18/325,738.
Application 18/325,738 is a continuation of application No. 17/356,153, filed on Jun. 23, 2021, abandoned.
Claims priority of provisional application 63/043,619, filed on Jun. 24, 2020.
Prior Publication US 2023/0308642 A1, Sep. 28, 2023
Int. Cl. H04N 7/12 (2006.01); G06T 9/00 (2006.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/189 (2014.01); H04N 19/51 (2014.01)
CPC H04N 19/105 (2014.11) [G06T 9/004 (2013.01); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/189 (2014.11); H04N 19/51 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of decoding video data, the method comprising:
reshaping a pixel domain reference template block using a forward mapping function into a mapped domain reference template block, wherein the forward mapping function comprises:
FwdMap(Y_pred)=((b2−b1)/(a2−a1))*(Y_pred−a1)+b1,
where Y_pred is a luma prediction signal, i is a piece index, a1 is an input pivot point of i, a2 is an input pivot point of i+1, b1 is a mapped pivot point of i, and b2 is a mapped pivot point of i+1;
deriving local illumination compensation (LIC) model parameters from the mapped domain reference template block and a mapped domain neighboring reconstruction template block;
applying the LIC model parameters to motion-compensated prediction signals; and
decoding the video data based on the application of the LIC model parameters.