An Automatic White Balance Algorithm Based on Pixel Luminance and Chromaticity.

Automatic white balance (AWB) is a crucially important part of digital still camera. It keeps constant color of an image by eliminating the color cast caused by non-canonical illuminant. A dynamic threshold is used to remove outliers in $$ C_{b} $$ and $$ C_{r} $$ components and detect the near-white region in an image. And we also describe a technique using both the internal illumination and all pixels in the near-white region to estimate the illuminant. The results show that the proposed technique is superior or comparable to the existing AWB algorithms. The algorithm is attractive for practical applications because of the low complexity.