US 12,033,358 B2
Luminance distribution determination
Bianca Maria Irma Van Der Zande, Heeze (NL); Johan-Paul Marie Gerard Linnartz, Eindhoven (NL); Thijs Kruisselbrink, Eindhoven (NL); Alexander Rosemann, Eindhoven (NL); and Rajendra Dangol, Eindhoven (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 17/606,135
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Apr. 28, 2020, PCT No. PCT/EP2020/061737
§ 371(c)(1), (2) Date Oct. 25, 2021,
PCT Pub. No. WO2020/221731, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 19171830 (EP), filed on Apr. 30, 2019.
Prior Publication US 2022/0207777 A1, Jun. 30, 2022
Int. Cl. G06T 7/90 (2017.01); G06T 5/50 (2006.01); G06T 5/92 (2024.01)
CPC G06T 7/90 (2017.01) [G06T 5/50 (2013.01); G06T 5/92 (2024.01); G06T 2207/10024 (2013.01); G06T 2207/20208 (2013.01); G06T 2207/20212 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of determining a spatial luminance distribution over at least one image of a scene illuminated by at least one illuminant, the image comprising RGB values for each pixel, the method comprising:
forming a combination of the RGB values to determine the luminance distribution, the combination having a set of coefficients comprising a respective coefficient for each of the RGB values;
wherein the coefficients are determined by:
identifying a spectral power distribution, SPD, of the at least one illuminant; and
determining values of the set of coefficients that minimize a spectral mismatch between: a) the identified SPD weighted by the combination; and b) the identified SPD weighted by a luminosity function.