Hierarchical local symmetries

@article{Cho1991HierarchicalLS,
  title={Hierarchical local symmetries},
  author={Kyugon Cho and Stanley M. Dunn},
  journal={Pattern Recognition Letters},
  year={1991},
  volume={12},
  pages={343-347}
}
We present a new 2D shape representation technique called hierarchical local symmetries (HLS) which eliminates redundant information in the Brady's smoothed local symmetries and organizes the axis information by the tangent difference between two boundary points forming a local symmetry. 

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Computational Aspects of Pattern Characterization - Continuous Symmetry

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Computational Symmetry in Computer Vision and Computer Graphics

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Symmetry Sensitivities of Derivative-of-Gaussian Filters

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