Decoding Color Structured Light Patterns with a Region Adjacency Graph

  • Authors:
  • Christoph Schmalz

  • Affiliations:
  • Siemens AG, CT PS 9, Munich, Germany 81739

  • Venue:
  • Proceedings of the 31st DAGM Symposium on Pattern Recognition
  • Year:
  • 2009

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Abstract

We present a new technique for decoding color stripe or color checkerboard patterns as often used for single-shot 3d range data acquisition with structured light. The key idea is to segment the camera image into superpixels with a watershed transform. We then describe a new algorithm that constructs a regions adjacency graph and uses it to solve the correspondence problem. This is an improvement over existing scanline based evaluation methods as the spatial coherence assumption can be relaxed. It allows to measure non-smooth objects that have so far posed problems for single-shot acquisition. The algorithm works in near real time even in uncontrolled environments. Experimental results are given.