A digital bar code slot reader provides low first bar error rates and a wide scan speed range for bar codes on laminated badges and tags, and is also capable of reading bar codes on paper. The reflectance waveform from the bar code is differentiated in order to find the regions of high slope. The differentiated...http://www.google.es/patents/US4740675?utm_source=gb-gplus-sharePatente US4740675 - Digital bar code slot reader with threshold comparison of the differentiated bar code signal
Digital bar code slot reader with threshold comparison of the differentiated ...
