A Method for Re-illuminating Faces from a Single Image
In this paper we propose a local-shape based method for correcting shape-from-shading information for raw surface height recovery of faces aiming to generate differently illuminated versions of a face. The underpinning idea comes from the observation that subtle changes in the elements of a gradient field can cause notable changes in its integrated surface. A new gradient field is calculated by modifying its orientations in accordance with critical points on the surface and local shape indicators. A raw height map is then calculated by integrating such field. Experiments show that altering the directions of a surface normal field of a face can be enough to generate differently illuminated fixed-pose versions of a face from a single image.
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