Browse Prior Art Database

OPTICAL CHARACTER RECOGNITION BY HARMONIC ANALYSIS

IP.com Disclosure Number: IPCOM000022967D
Original Publication Date: 1976-May-31
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

A hand printed symbol1 such as the number 2~ is scanned optically by scanner 1 and a digitized image of the symbol is stored in storage device 2. Coordinates from each of two orthogonal axis to the symbol are traced and measured in device 3, which may comprise a digital computer appropriately programmed. Fourier analysis of the coordinate measurements provides harmonic outputs 4~ 5 and 6 which correspond to the amplitude and phase of the second, third and fourth harmonic1 respectively. The harmonics which comprise each symbol are unique to that symbol. The symbol is identified by comparing the measured harmonics thereof with a reference harmonic signal in comparator 7~ a signal output E0 being generated when the symbol harmonics are identical to the reference signal harmonics thereby identifying the symbol.