Automatic illuminant estimation and white balance adjustment based on color gamut unions

摘要

A system for estimating an illuminant of a scene that was captured by an input image includes a control system that generates an input gamut that includes the input colors for the input image. Further, the control system compares the input gamut to an illuminant database that includes separate information from a gamut of observable colors for a plurality of possible illuminants to estimate the possible illuminant. Each illuminant can be represented by a separate illuminant gamut. Moreover, each gamut can be organized as a matrix. Additionally, the control system can combine the input gamut with each of the illuminant gamuts to generate a separate union gamut for each of the possible illuminants. The control system can compare the union gamut and the corresponding illuminant gamut for each possible illuminant to estimate the illuminant. After estimating the possible illuminant, the control system performs color correction on the input image.

主权项

1. A system for estimating an illuminant of a scene that was captured by an input image that includes a plurality of input colors, the system comprising:
a control system that generates an input gamut organized as a matrix having a plurality of rows and a plurality of columns that includes the input colors for the input image, the control system including an illuminant database having a separate illuminant gamut of the observable colors for each of a plurality of potential illuminants, each illuminant gamut being expressed as a matrix having a plurality of rows and a plurality of columns; and the control system compares the input gamut organized as the matrix with the plurality of rows and columns to the illuminant gamut organized as the matrix with the plurality of rows and columns for each of the potential illuminants, wherein the control system combines the input gamut with each of the illuminant gamuts to generate a separate union gamut for each of the possible illuminants, wherein each union gamut is organized as a matrix having a plurality of rows and a plurality of columns.