Describe the relationship between 'shape from shading' and the position of the light source.

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Describe the relationship between 'shape from shading' and the position of the light source.



Shape can be recovered from a single image by human visual system based on the shading
information. To estimate the shape from a single image, some assumptions have to be made, e.g. constant albedo (surface color). This technique is very useful for reconstructing surfaces of planets from photographs acquired by spacecrafts. For example, the concave/convex ambiguity

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