Shape, Albedo, and Illumination from a Single Image of an Unknown Object Supplementary Material
نویسندگان
چکیده
We will discretely approximate this using filter output. We would like to use 3× 3 filters so that gradient estimates are located on pixels, rather than between pixels. Naively we would do this using sobel filters, but that formulation has the property that ‖∇A‖x,y is not a function of Ax,y , because of the zeros in the filters being used. This often leads to undesirable artifacts in the output, where single isolated pixels of A are wrong. We will therefore use this formulation:
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