Tiziani, Hans J.Beyeler, Bernhard H.Witz, Werner2011-02-212016-03-312011-02-212016-03-311970346470366http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-60482http://elib.uni-stuttgart.de/handle/11682/7500http://dx.doi.org/10.18419/opus-7483An opto-electronic technique for the classification of grains of photographic emulsions by shape is described. Fortunately, the shapes to be distinguished differ only in their two-dimensional rotational symmetry group. A special optical filtering procedure has been developed to take account of the implied positional and rotational invariance. The transfer from the optical to the electrical signal is obtained in a simple manner. The method works satisfactorily even for a rather complicated cluster. Some results are discussed.eninfo:eu-repo/semantics/openAccessOptoelektronik , Mustererkennung530article