## A Parallel Method for Earth Mover's DistanceWuchen Li, Ernest K. Ryu, Stanley Osher, Wotao Yin, and Wilfrid Gangbo Published in Journal of Scientific Computing ## OverviewThis paper presents a new, parallel algorithm to approximate the Earth Mover's distance (EMD). By the theory of optimal transport, EMD can be reformulated as a familiar L1 type minimization. We use a regularization that gives us a unique solution for this L1 type problem. The new regularized minimization is very similar to problems which have been solved in the fields of compressed sensing and image processing, where several fast methods are available. In this paper, we adopt a primal-dual algorithm designed there, which uses very simple updates at each iteration and is shown to converge very rapidly. Several numerical examples are provided.
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