G - Physics – 06 – K
Patent
G - Physics
06
K
354/65, 354/72
G06K 9/20 (2006.01) G06K 9/38 (2006.01)
Patent
CA 1066806
ABSTRACT A set of photoelectric transducers, optically scan- ning a line transverse to the direction of movement of a character-bearing document to be electronically read, is periodically actuated to pick up light from a multiplicity of elemental areas of that document and to generate electrical analog voltages commensurate with the brightness of these area The analog voltages are serially read out from one or more shift registers as a pulse train or several parallel pulse trains each undergoing digitization and subsequent storage in respective cells of an associated memory. A group of these cells contain, at a given instant, digital codes representative of the relative brightness of respective elemental areas otho- gonally arrayed in a square surface portion of the document divided into a middle zone and four diagonally adjoining peri- pheral zones, the middle zone being centered on the point cur- rently scanned. The relative brightness of that scanned point is weighted by an adaptive field function, based on the relative brightness of the peripheral areas, to yield a responsive para- meter whose joint evaluation with the relative brightness of the scanned point yields a binary output signal. A series of such output signals, derived from simultaneous readings of a corresponding number of adjoining transducers, is converted in- to a multibit word fed to a utilization circuit.
264576
Giuliano Ercole
Paita Orazio
Stringa Luigi
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