Abstract
In many applications, one is interested in the shape of an object, like the contour of a bone or the trajectory of joints of a tennis player, irrespective of the way these shapes are parameterized. However for analysis of these shape spaces, it is sometimes useful to have a parameterization at hand, in particular if one is interested in deforming shapes. The purpose of the paper is to examine three different methods that one can follow to endow shape spaces with a Riemannian metric that is measuring deformations in a parameterization independent way. The first is via Riemannian submersion on a quotient; the second is via isometric immersion on a particular slice; and the third is an alternative method that allows for an arbitrarily chosen complement to the vertical space and a metric degenerate along the fibers, which we call the gauge-invariant metric. This allows some additional flexibility in applications, as we describe.
Supported by FWF grant I 5015-N, Institut CNRS Pauli and University of Lille.
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Tumpach, A.B., Preston, S.C. (2023). Three Methods to Put a Riemannian Metric on Shape Space. In: Nielsen, F., Barbaresco, F. (eds) Geometric Science of Information. GSI 2023. Lecture Notes in Computer Science, vol 14071. Springer, Cham. https://doi.org/10.1007/978-3-031-38271-0_1
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DOI: https://doi.org/10.1007/978-3-031-38271-0_1
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