1. Generalizing the Hough transform to detect arbitrary shapes;Ballard;Pattern Recognit.,1981
2. Central symmetry modelling;Bigu¨n,1986
3. Optimal orientation detection of linear symmetry;Bigu¨n,1987
4. Recognition of local symmetries in gray value images by harmonic functions;Bigu¨n,1988
5. Teragon Context AB,1987