Free-Shape Polygonal Object Localization

  • Xiaolu Sun
  • C. Mario Christoudias
  • Pascal Fua
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8694)

Abstract

Polygonal objects are prevalent in man-made scenes. Early approaches to detecting them relied mainly on geometry while subsequent ones also incorporated appearance-based cues. It has recently been shown that this could be done fast by searching for cycles in graphs of line-fragments, provided that the cycle scoring function can be expressed as additive terms attached to individual fragments. In this paper, we propose an approach that eliminates this restriction. Given a weighted line-fragment graph, we use its cyclomatic number to partition the graph into managebly-sized sub-graphs that preserve nodes and edges with a high weight and are most likely to contain object contours. Object contours are then detected as maximally scoring elementary circuits enumerated in each sub-graph. Our approach can be used with any cycle scoring function and multiple candidates that share line fragments can be found. This is unlike in other approaches that rely on a greedy approach to finding candidates. We demonstrate that our approach significantly outperforms the state-of-the-art for the detection of building rooftops in aerial images and polygonal object categories from ImageNet.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Xiaolu Sun
    • 1
  • C. Mario Christoudias
    • 1
  • Pascal Fua
    • 1
  1. 1.CVLab, EPFLLausanneSwitzerland

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