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Phos is a dataset for evaluating illumination invariance: 15 scenes, 14 types of illumination (with shadows) + Ground Truth. It is a color image database of 15 scenes captured under different illumination conditions. More particularly, every scene of the database contains 15 different images: 9 images captured under various strengths of uniform illumination, and 6 images under different degrees of non-uniform illumination. The images contain objects of different shape, color and texture and can be used for illumination invariant feature detection and selection.