author= {Lehmann, Thomas M. and Goudarzi, Sascha and Linnenbr{"u}gger, Nick and Keysers, Daniel and Wein, Berthold},
title= {Automatic Localization and Delineation of Collimation Fields in Digital- and Film-based Radiographs},
booktitle= {International Society for Optical Engineering},
year= 2002,
pages= {1215-1223},
address= {San Diego, CA},
month= feb,
series= {Proc. SPIE},
pdf = {https://www-i6.informatik.rwth-aachen.de/publications/downloader.php?id=138&row=pdf}