Method for determining the color of a scene illuminant from a co

Details Method for determining the color of a scene illuminant from a co Method for determining the color of a scene illuminant from a co

1985-03-18

1987-08-04

Chin, Gary

Boots, shoes, and leggings

354430, 355 38, G01J 100

Patent

active

046850716

ABSTRACT:
A method of determining the color of light employed to illuminate the scene in a color image from the image itself, relies upon detecting the color of the specularly reflected light in the image. In a preferred mode of practicing the invention, the color of specularly reflected light is detected by detecting a plurality of sets of points having constant hue and varying saturation on a plurality of differently colored surfaces in the scene, and determining the locus of the intersection of straight lines fit through the color values of the sets of points. The locus of the intersection of the straight lines indicates the color of the scene illuminant. In an application of the method in a color printer, the determined illuminant color is employed as the aim point in the photographic printing process.

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patent: 4406538 (1983-09-01), Buhler

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