Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 22, 2008
0Patent Application Number
102132930
Date Filed
August 6, 2002
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An apparatus and method for estimating the power spectral density of an unknown illuminant that does not require direct spectral measurements. The apparatus and method allows calibration of color images taken with commercially available digital cameras in arbitrary illumination. Besides an imaging system, a digital computer, a means for transferring image information from the imaging system to the digital computer, and software to carry out the method, the only additional equipment a photographer needs is a set of color standards.
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