A 3D isotropic quadrature filter for motion estimation problems
 @InProceedings{krause05vcip,
  author = 	 {M. Krause and G. Sommer},
  title = 	 {A 3D isotropic quadrature filter for motion estimation problems},
  booktitle = 	 {Proc. Visual Communications and Image Processing, Beijing, China},
Publisher = {The International Society for Optical Engineering, Bellingham},
editors = {S. Li and F. Pereira and H.-Y. Shum and A.G. Tescher},
serie = {SPIE},
volume = {5960},
pages = {1295-1306},
year =	 2005,
}