Thinning algorithms based on quadtree and octree representations

  • Authors:
  • Wai-Tak Wong;Frank Y. Shih;Te-Feng Su

  • Affiliations:
  • Department of Information Management, Chung-Hua University, No. 707, Sec. 2, Wu Fu Road, Hsin Chu, Taiwan, ROC;Computer Vision Laboratory, College of Computing Sciences, New Jersey Institute of Technology, Newark, NJ 07102, USA;Department of Information Management, Chung-Hua University, No. 707, Sec. 2, Wu Fu Road, Hsin Chu, Taiwan, ROC

  • Venue:
  • Information Sciences: an International Journal
  • Year:
  • 2006

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Abstract

Thinning is a critical pre-processing step to obtain skeletons for pattern analysis. Quadtree and octree are hierarchical data representations in image processing and computer graphics. In this paper, we present new 2-D area-based and 3-D surface-based thinning algorithms for directly converting quadtree and octree representations to skeletons. The computational complexity of our thinning algorithm for a 2-D or a 3-D image with each length N is respectively O(N^2) or O(N^3), which is more efficient than the existing algorithms of O(N^3) or O(N^4). Furthermore, our thinning algorithms can lessen boundary noise spurs and are suited for parallel implementation.