A process and an apparatus for treatment of an analog electric signal, in particular the image signal of bar codes, for obtaining a parametrable binary signal, the process comprising storing certain non-linear filtering parameters (MP) and, after having converted the analog signal into a digital signal...http://www.google.de/patents/US5097263?utm_source=gb-gplus-sharePatent US5097263 - Process and apparatus for treatment of an analog electric signal for obtaining a parametrable binary signal representative of its significant component
