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Evaluation of invariant models for dolphin photo-identification

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4 Author(s)
Araabi, B.N. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Kehtarnavaz, N. ; Hillman, G. ; Wursig, B.

Individual identification of dolphins is of much interest to marine mammologists. Natural markings and notches on the trailing edge of the dorsal fin provide an almost unique signature within a study population for individual recognition. The dorsal fin is an almost rigid, planar object, and, as a result, the problem boils down to planar curve matching. Invariants under three groups of similarity, affine and projective transformations are examined in this paper. Three families of differential, algebraic and semi-differential invariants are studied and evaluated for their applicability and performance in dolphin identification from photographs. It is observed that, under practical conditions, for smooth quasi-rigid curves like the trailing edge of the dorsal fin, curvature-based matching methods outperform almost all of the other techniques which offer a higher level of invariance

Published in:

Computer-Based Medical Systems, 2001. CBMS 2001. Proceedings. 14th IEEE Symposium on

Date of Conference:

2001

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