Recognition by symmetry derivatives and the generalized structure tensor

  title={Recognition by symmetry derivatives and the generalized structure tensor},
  author={Josef Big{\"u}n and Tomas Bigun and Kenneth Nilsson},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence},
We suggest a set of complex differential operators that can be used to produce and filter dense orientation (tensor) fields for feature extraction, matching, and pattern recognition. We present results on the invariance properties of these operators, that we call symmetry derivatives. These show that, in contrast to ordinary derivatives, all orders of symmetry derivatives of Gaussians yield a remarkable invariance: they are obtained by replacing the original differential polynomial with the… CONTINUE READING
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