Patent ID: 9118880
Filing Date: 2015-08-25
Classification: H04N

Abstract:
1. An image apparatus for determining an estimated illuminant of a scene, the image apparatus comprising: a capturing system including an image sensor that captures an input image of the scene, the input image including a plurality of input colors, including a first input color and a second input color; a storage system that includes a memory that stores an illuminant database that includes a one-dimensional chromatic subspace for a first illuminant and a one-dimensional chromatic subspace for a second illuminant that is different from the first illuminant; and a control system including a processor that accesses the illuminant database from the storage system to estimate the estimated illuminant of the scene, wherein the control system (i) compares the first input color to the one-dimensional chromatic subspace for the first illuminant to compute a first, first separation distance that represents how far or close the first input color is to the one-dimensional chromatic subspace for the first illuminant; and (ii) compares the first input color to the one-dimensional chromatic subspace for the second illuminant to compute a first, second separation distance that represents how far or close the first input color is to the one-dimensional chromatic subspace for the second illuminant.