Optimal Computation of 3-D Rotation under Inhomogeneous Anisotropic Noise
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概要
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We present a new method for optimally computing the 3-D rotation from two sets of 3-D data.Unlike 2-D data, the noise in 3-D data is inherently inhomogeneous and anisotropic, reflecting the characteristics of the 3-D sensing used. To cope with this, Ohta and Kanatani introduced a technique called “renormalization”. Following them, we represent a 3-D rotation in terms of a quaternion and compute an exact maximum likelihood solution using the FNS of Chojnacki etal. As an example, we consider 3-D data obtained by stereo vision and optimally compute the 3-D rotation by analyzing the noise characteristics of stereo reconstruction. We show that the widely used method is not suitable for 3-D data. We confirm that the renormalization of Ohta andKanatani indeed computes almost an optimal solution and that, although the difference is small, the proposed method can compute an even better solution.
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