Planar Ultrametric Rounding for Image Segmentation

9 Jul 2015  ·  Julian Yarkony, Charless C. Fowlkes ·

We study the problem of hierarchical clustering on planar graphs. We formulate this in terms of an LP relaxation of ultrametric rounding. To solve this LP efficiently we introduce a dual cutting plane scheme that uses minimum cost perfect matching as a subroutine in order to efficiently explore the space of planar partitions. We apply our algorithm to the problem of hierarchical image segmentation.

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