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<p><it>Abstract</it>—We show that there is, in general, a unique solution for the relative orientation of three cameras simultaneously photographing four feature points on a fixed object. However, multiple solutions are possible, in rare cases, even when the four feature points are not coplanar.</p>
Motion estimation, computer vision, polynomial systems, algebraic geometry.
Arun N. Netravali, Robert J. Holt, "Uniqueness of Solutions to Three Perspective Views of Four Points", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 17, no. , pp. 303-307, March 1995, doi:10.1109/34.368195
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