Shape from shading Pentland approach

Pentland used the linear approximation of the reflectance function in terms of the surface gradient, and applied a Fourier transform to the linear function to get a closed form solution for the depth at each point. (Pentland takes the Fourier transform of both sides of the equation). (Pentland, A., “Shape Information From Shading: A Theory About Human Perception,” Computer Vision., Second International Conference on , vol., no., pp.404-413, 5-8 Dec 1988.)

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