Oriented projective geometry
A Theory of Multiscale, Curvature-Based Shape Representation for Planar Curves
IEEE Transactions on Pattern Analysis and Machine Intelligence
Planar object recognition using projective shape representation
International Journal of Computer Vision
Differential and Numerically Invariant Signature Curves Applied to Object Recognition
International Journal of Computer Vision
Numerically Invariant Signature Curves
International Journal of Computer Vision
Proceedings of the Second Joint European - US Workshop on Applications of Invariance in Computer Vision
The Local Projective Shape of Smooth Surfaces and Their Outlines
International Journal of Computer Vision
International Journal of Computer Vision
Combining Points and Tangents into Parabolic Polygons
Journal of Mathematical Imaging and Vision
Projective Estimators for Point/Tangent Representations of Planar Curves
SIBGRAPI '08 Proceedings of the 2008 XXI Brazilian Symposium on Computer Graphics and Image Processing
High-Order differential geometry of curves for multiview reconstruction and matching
EMMCVPR'05 Proceedings of the 5th international conference on Energy Minimization Methods in Computer Vision and Pattern Recognition
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Recognizing shapes in multiview imaging is still a challenging task, which usually relies on geometrical invariants estimations. However, very few geometric estimators that achieve projective invariance have been devised. This paper proposes a projective length and a projective curvature estimators for plane curves, when the curves are represented by points together with their tangent directions. In this context, the estimations can be performed with only three point-tangent samples for the projective length and five samples for the projective curvature. The proposed length and curvature estimator are based on projective splines built by fitting logarithmic spirals to the point-tangent samples. They are projective invariant and convergent.