Fast anisotropic gauss filtering

@InProceedings\{GSV2002,
  author       = "Jan-Mark Geusebroek and Arnold W.M. Smeulders and Joost van de Weijer",
  title        = "Fast anisotropic gauss filtering",
  booktitle    = "European Conference on Computer Vision (ECCV)",
  year         = "2002",
  address      = "Copenhagen, Denmark",
  url          = "http://cat.cvc.uab.es/Public/Publications/2002/GSV2002"
}