A bar code detector or acquisition arrangement for detecting the presence and location of a bar code pattern in a field of view. The bar code pattern detector is not designed to decode a bar code pattern, but merely to be sensitive to and detect the presence of a bar code pattern or patterns so that...http://www.google.es/patents/US5196683?utm_source=gb-gplus-sharePatente US5196683 - Bar code acquisition utilizing moire patterns
