A method for contour recognition of completely or partly transparent objects (2), e.g. containers like glass or plastic bottles, the object being advanced through an illumination and detector station (3-13; 3, 4, 20, 21) and there being illuminated on at least part of its circumference. The light reflected...http://www.google.ca/patents/US4625107?utm_source=gb-gplus-sharePatent US4625107 - Method for contour recognition of totally or partly transparent objects, e.g., bottles
