Improved methods of estimating shape from shading using the light source coordinate system
Artificial Intelligence
Acquiring the reflectance field of a human face
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
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The Free-form Light Stage captures the reflectance field of an object using a freely movable, hand-held light source. By photographing the object under different illumination conditions, we are able to render the object under any lighting condition, using a linear combination of basis images. Our technique builds on recent techniques, such as the Light Stage [Debevec et al. 2000], where light sources are placed at fixed and known positions (e.g. using a gantry). We remove this limitation, and put no restrictions on light source placement.