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Definition The purpose of illumination estimation is to determine the direction, intensity, and/or color of the lighting in a scene. In contrast to direct measurement of lighting, the illumination information is inferred from cues within the scene, without use of a special probe or color calibration chart. Definition An image decomposition is the result of a mathematical transformation of an image into a new set of images I 376 Image Enhancement and Restoration 6. Tappen MF, Adelson EH, Freemandoi:10.1007/978-0-387-31439-6_100030 fatcat:kfm7gu7zenb6tlz5qu26dvf3q4