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READING APPARATUS

  • US 3,582,883 A
  • Filed: 10/13/1966
  • Issued: 06/01/1971
  • Est. Priority Date: 10/13/1966
  • Status: Expired due to Term
First Claim
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1. Apparatus for reading intelligence-bearing items comprising:

  • means for scanning the area of an item to be read along a plurality of scanning frames and producing current scan signals during each scanning frame characteristic of the item scanned, logic means for continuously performing over all scanning frames including and prior to the current scanning frame logical operations on the whole set of scan signals for each current scanning frame with a second set of signals applied thereto to produce a composite transformed scan signal set output comprising at least one signal element having no more than a single bit per signal element, said composite transformed signal set output being the logical sUm of the constituent signal elements of the whole sets of the scan signal from all of the scanning frames prior to and including each current scanning frame, storage means for delaying said composite transformed scan signal set output of the logic means during each scanning frame to form said second set of signals and applying the same during successive subsequent scanning frames to said logic means in frame coordinated relation with the whole set of current scan signals for such subsequent scanning frames whereby said composite transformed scan signal set output produced during each scanning frame comprises a set of transformed scan signals whose constituent signal elements are essentially horizontal projections of intercepted portions of the item corresponding to shadowlike horizontal projections of the item defining a configuration which is related to but distinguishable from the area of the item to be read, first detection means for detecting preselected intracharacter patterns from at least one of said composite signals, said one composite signal being sometimes utilized before that scanning frame which last intersects the item, and means for recognizing the item to be identified by employing said patterns for providing an output signal indicative of the item recognized.

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