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Two representations of the projection of 3D points reconstructed by VisualSFM: a) projection of the 3D points on a phase map of a scleral shell; b) projection of 3D points on the 3D model of a corneal shell illustrating the different surface coverage of the 3- (blue) and 4-tuples (red) of phase values that satisfy the matching function according to Eq. (5).
