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Har-Peled, Sariel; Raichel, Benjamin
ACM transactions on algorithms, 01/2014, Letnik: 10, Številka: 1Journal Article
Given two simplicial complexes in R d and start and end vertices in each complex, we show how to compute curves (in each complex) between these vertices, such that the weak Fréchet distance between these curves is minimized. As a polygonal curve is a complex, this generalizes the regular notion of weak Fréchet distance between curves. We also generalize the algorithm to handle an input of k simplicial complexes. Using this new algorithm, we can solve a slew of new problems, from computing a mean curve for a given collection of curves to various motion planning problems. Additionally, we show that for the mean curve problem, when the k input curves are c -packed, one can (1+ε-approximate the mean curve in near-linear time, for fixed k and ε. Additionally, we present an algorithm for computing the strong Fréchet distance between two curves, which is simpler than previous algorithms and avoids using parametric search.
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