Rotational Invariance Based on Fourier Analysis in Polar and Spherical Coordinates. Wang, Q., Ronneberger, O., & Burkhardt, H. IEEE Trans. Pattern Anal. Mach. Intell. (PAMI), 31(9):1715-1722, 2009.  
Paper  bibtex   @article{ dblp3035415,
  title = {Rotational Invariance Based on Fourier Analysis in Polar and Spherical Coordinates},
  author = {Qing Wang and Olaf Ronneberger and Hans Burkhardt},
  author_short = {Wang, Q. and Ronneberger, O. and Burkhardt, H.},
  bibtype = {article},
  type = {article},
  year = {2009},
  key = {dblp3035415},
  id = {dblp3035415},
  biburl = {http://www.dblp.org/rec/bibtex/journals/pami/WangRB09},
  url = {http://doi.ieeecomputersociety.org/10.1109/TPAMI.2009.29},
  journal = {IEEE Trans. Pattern Anal. Mach. Intell. (PAMI)},
  pages = {1715-1722},
  number = {9},
  volume = {31},
  text = {IEEE Trans. Pattern Anal. Mach. Intell. (PAMI) 31(9):1715-1722 (2009)}
} 
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