Neural Network Model for the Cortical Representation of Surface Curvature from Images of Shaded Surfaces

1. Introduction As is well known to artists, the continuous gradations of shading within an image can be used to convey information about the three-dimensional shape of a surface. One of the problems with using shading information, however, is that the pattern of light and dark formed by light reflected from the surface depends on the direction of illumination as well as surface shape (Ikeuchi and Horn, 1981). Nevertheless,

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