Patent ID: 8055063
Filing Date: 2011-11-08
Classification: H04N

Abstract:
1. An image color adjustment method, said method comprising: a) obtaining pixel color data for a plurality of pixels; b) estimating an estimated illuminant based on said color data, wherein said estimated illuminant is determined by: c) computing a color correction matrix based on said frequency distribution, said matrix approximating the mapping of a surface reflectance function from said estimated illuminant to a canonical illuminant, wherein said computing is performed by a computing device comprising a processor and memory; d) determining a likelihood that said estimated illuminant is an actual illuminant, which illuminated said plurality of pixels at the time of their creation; e) adjusting the color of said plurality of pixels when said likelihood satisfies a conditional parameter, wherein said adjusting is performed by an adjustment device comprising a processor, and where said conditional parameter reflects an attribute of a cumulative probability distribution of confidence values that respective pixels were illuminated by said estimated illuminant, based on the expression where t p is said conditional parameter, f(x) is a probability distribution, and where a and t p are empirically-determined values; f) attenuating said adjusting the color of said plurality of pixels when said likelihood does not satisfy said conditional parameter, wherein said attenuating is performed by said adjustment device comprising a processor.