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Matching point sets with respect to the Earth Mover's Distance
Cabello, Sergio ...
The Earth Mover's Distance (EMD) between two weighted point sets (point distributions) is a distance measure commonly used in computer vision for color-based image retrieval and shape matching. It ...measures the minimum amount of work needed to transform one set into the other one by weight transportation. We study the following shape matching problem: Given two weighted point sets ▫$A$▫ and ▫$B$▫ in the plane, compute a rigid motion of ▫$A$▫ that minimizes its Earth Mover's Distance to ▫$B$▫. No algorithm is known that computes an exact solution to this problem. We present simple FPTAS and polynomial-time ▫$(2+\epsilon)$▫-approximation algorithms for the minimum Euclidean EMD between ▫$A$▫ and ▫$B$▫ under translations and rigid motions.
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