Computational approaches for solving the bas-relief ambiguity under orthographic projection

Abstract Bas-relief ambiguity exists in point correspondences of two views. We present two algorithms that compute the rotation angle from two and three views. In the two view case with known rotation axis, a statistically unbiased least square approach is derived to compute the rotation angle uniquely. In three views, a numerical method is used to recover the rotation axis based on the assumption of equal rotations.

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