White point estimation using color by convolution
AssigneeHewlett-Packard Development Company, L.P.
InventorsPaul M. Hubel, Graham D. Finlayson, Steven D. Hordley
Life of this patent
Estimating the term…
Abstract
The probability of a chromaticity being a white point of image scene illumination is estimated by convolving a chromaticity histogram with a function of log probability distribution of chromaticities under an illuminant.
Claims36
A method of estimating the probability of a chromaticity being a white point of image scene illumination, the method comprising determining H(x, y){circle over (x)}Qx0,y0(x,y).
A method of determining a white point of scene illumination, the method comprising determining a log likelihood by convolving a chromaticity histogram with a function of log probability distribution of chromaticities under an illuminant.
Apparatus comprising a processor for computing at least one log likelihood probability of a chromaticity being a white point of image scene illumination in a digital image, each probability computed by convolving a chromaticity histogram with a function of log probability distribution of chromaticities under an illuminant.
A program for causing a processor to estimate a probability of a chromaticity being a white point of image scene illumination in a digital image by determining H(x,y){circle over (x)}Qx0,y0(x,y).
Dependencies are inferred from the claim text.