Image colors are biased by the color of the prevailing illumination. Illuminant estimation algorithms attempt to infer the color of the light incident in a scene and then a color cast removal step discounts the color bias due to illumination. However, despite sustained research beginning over 50 years ago, progress has been modest. The best algorithms -now often built on top of expensive feature extraction and machine learning - are only about twice as good as the simplest approaches.
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