New Method of Character Reading by Optical Correlation Technique

概要

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A new method of code transformation and character recognition technique is proposed. The essential aspect of the method is to obtain the optical correlation between an input character and a specially designed reference pattern which are juxtaposed in the input plane of a Fourier transforming optical system. If the input character matches the reference pattern, the output is obtained as a coded bit pattern. The method has the following advantages : (1) Severe accuracy of filter setting as in Vander Lugt method is not required. (2) Auto-correlation peaks of characters in the reference pattern are produced at the same time and are used as discrimination standards. (3) Output signals are easily processed by a digital computer.
社団法人応用物理学会の論文
1974-06-05