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Approximating the Maximum Overlap of Polygons under Translation

Sariel Har-Peled and Subhro Roy.
Let $P$ and $Q$ be two simple polygons in the plane of total complexity $n$, each of which can be decomposed into at most $k$ convex parts. We present an $(1-\varepsilon)$-approximation algorithm, for finding the translation of $Q$, which maximizes its area of overlap with $P$. Our algorithm runs in $O( c n \log n)$ time, where $c$ is a constant that depends only on $k$ and $\varepsilon$. This suggest that for polygons that are ``close'' to being convex, the problem can be solved (approximately), in near linear time.
Last modified: Wed Jan 22 16:16:29 CST 2014