US 12,244,938 B2
Brightness based chromaticity weighting for improved illuminant color estimation for auto white balancing
Douglas Taylor, Santa Clara, CA (US); and Animesh Khemka, Fremont, CA (US)
Assigned to NVIDIA Corporation, Santa Clara, CA (US)
Filed by NVIDIA Corporation, Santa Clara, CA (US)
Filed on Dec. 9, 2022, as Appl. No. 18/078,667.
Prior Publication US 2024/0196104 A1, Jun. 13, 2024
Int. Cl. H04N 23/88 (2023.01); G06T 7/90 (2017.01); H04N 9/77 (2006.01); H04N 23/71 (2023.01); H04N 23/76 (2023.01)
CPC H04N 23/88 (2023.01) [G06T 7/90 (2017.01); H04N 9/77 (2013.01); H04N 23/71 (2023.01); H04N 23/76 (2023.01); G06T 2207/10024 (2013.01); G06T 2207/20021 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
estimating a scene brightness of a scene depicted in an image, the estimated scene brightness being based at least on a measure of one or more color components of the image;
determining a chromaticity weighting function to apply to the image based at least on the estimated scene brightness of the scene depicted in the image;
estimating at least one illuminant color corresponding to the scene by applying the chromaticity weighting function to adjust a contribution of one or more portions of the image; and
adjusting one or more values corresponding to the image based at least on the at least one illuminant color.