The invariant representations of a quadric cone and a twisted cubic

Authors:
Y. H. Wu;Z. Y. Hu
Affiliations:
Nat. Lab. of Pattern Recognition, Inst. of Autom. Chinese Acad. of Sci., Beijing, China;-
Venue:
IEEE Transactions on Pattern Analysis and Machine Intelligence
Year:
2003

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Abstract

Up to now, the shortest invariant representation of a quadric has 138 summands and there has been no invariant representation of a twisted cubic in 3D projective space, which limit to some extent the applications of invariants in 3D space. We give a very short invariant representation of a quadric cone, a special quadric, which has only two summands similar to the invariant representation of a planar conic, and give a short invariant representation of a twisted cubic. Then, a completely linear algorithm for generating the parametric equations of a twisted cubic is provided also. Finally, we exemplify some applications of our proposed invariant representations in the fields of computer vision and automated geometric theorem proving.