Systems and methods for illuminant estimation

Details Systems and methods for illuminant estimation Systems and methods for illuminant estimation

2008-03-14

2009-11-10

Ge, Yuzhen (Department: 2624)

Image analysis

Color image processing

Reexamination Certificate

active

07616810

ABSTRACT:
Aspects of the present invention comprise systems and methods for image illuminant estimation. Some aspects relate to computing an image histogram comprising data relating the frequency of image element color values to color values found under said candidate illuminants, determining match scores for the plurality of candidate illuminants, determining a minimum match score of the match scores and determining minimum match score chromaticity coordinates. Some aspects relate to fitting a surface to the match scores wherein the surface represents illuminant parameter values other than the candidate illuminants, solving for an extremum of the surface and determining chromaticity coordinates of the extremum. Some aspects relate to selecting estimated image illuminant coordinates based on the relative location of the coordinates of one of the candidate illuminants, the coordinates of the extremum and/or the minimum match score chromaticity coordinates.

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