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Definition
Geodesics are locally the shortest paths in some space. Equivalently, geodesics are curves for which small perturbation increases their length according to some measure. A minimal geodesic corresponds to the shortest geodesic connecting two points. In computer vision and pattern recognition, the way distance is measured and the resulting geodesics define the specific application, see [1] for a pedagogical introduction to the field of numerical geometry of images.
Background
Edge detectors can be defined from a variational perspective where an edge is a curve along which the image gradient aligns with the curve’s normal [2–6]. These types of edges are geodesics in the sense of integrating the inner product between the curve’s normal and the image gradient and by Green’s Theorem can be shown to be the Marr-Hildreth edge detectors [7], also known as...
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Kimmel, R. (2014). Geodesics, Distance Maps, and Curve Evolution. In: Ikeuchi, K. (eds) Computer Vision. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-31439-6_769
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DOI: https://doi.org/10.1007/978-0-387-31439-6_769
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