US 11,783,752 B2
Gamma lookup table compression
Hyunchul Kim, San Jose, CA (US); Sun-il Chang, San Jose, CA (US); Wonjae Choi, San Jose, CA (US); and Sang Young Youn, Cupertino, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Appl. No. 17/615,992
Filed by Google LLC, Mountain View, CA (US)
PCT Filed Dec. 17, 2019, PCT No. PCT/US2019/066859
§ 371(c)(1), (2) Date Dec. 2, 2021,
PCT Pub. No. WO2021/126169, PCT Pub. Date Jun. 24, 2021.
Prior Publication US 2022/0319382 A1, Oct. 6, 2022
Int. Cl. G09G 3/20 (2006.01); G09G 5/00 (2006.01)
CPC G09G 3/2074 (2013.01) [G09G 5/005 (2013.01); G09G 2320/0276 (2013.01); G09G 2320/0285 (2013.01); G09G 2320/0673 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a gamma value for a pixel of an image to be shown on a display;
determining a base gamma value based on a base lookup table that corresponds to a base display condition;
determining a delta gamma value based on a delta lookup table that corresponds to a current display condition for the pixel, wherein determining the delta gamma value based on the delta lookup table that corresponds to the current display condition for the pixel comprises:
determining the current display condition;
determining a set of delta gamma values based on delta lookup tables that each correspond to a different display condition; and
selecting the delta gamma value from the set of delta gamma values based on the current display condition;
determining a remapped gamma value for the pixel based on a combination of the base gamma value and the delta gamma value; and
providing the remapped gamma value to be shown on the display.