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Approximating the Frechet Distance for Realistic Curves in Near Linear Time

Anne Driemel, Sariel Har-Peled, and Carola Wenk.

We introduce a new realistic family of curves, which we call c-packed curves. Interestingly, this family is closed under simplification, a property that makes it especially useful. Next, we present the first near linear time approximation algorithm for the Frechet distance for polygonal c-packed curves in Rd. The algorithm also works in near linear time for low-density curves in the plane. In higher dimensions, one can approximate the Frechet distance of low-density curves in subquadratic time.


Last modified: Tue Jan 26 04:59:05 CST 2010