Accession Number : AD0759220

Title :   Spatial Filtering Techniques for Word/Character Recognition.

Descriptive Note : Final rept. 1 Mar-31 Dec 72,

Corporate Author : HARRIS ELECTRO-OPTICS CENTER OF RADIATION ANN ARBOR MICH

Personal Author(s) : Rotz,F. B. ; Morrison,J. P.

Report Date : MAR 1973

Pagination or Media Count : 65

Abstract : INFORMATION THEORYOPTICAL SPATIAL FILTERS, DATA PROCESSING, OPTICAL DATA, OPTICAL CHARACTER RECOGNITION, PDP-8 COMPUTERS, FOURIER TRANSFORMATION, HOLOGRAPHY, SUBJECT INDEX TERMSAn experimental study was conducted to determine the feasibility of using optical spatial filtering techniques to search documents for the presence of key words. A breadboard model of the word detection system including an electronic readout subsystem was fabricated. The basic word detection system consists of an optical processor and a filter generator. The electronic readout subsystem consists of an image orthicon TV camera and monitor, an interface device, a PDP-8/e computer with teletype, and a graphics display unit. This system can efficiently collect, collate, and analyze experimental data. In the study filters were recorded on photographic plates and on photoplastic material. The effects of recording parameter changes on word discrimination were studied and software developed to write filters and read out data. (Author)

Descriptors :   (*INFORMATION RETRIEVAL, *CHARACTER RECOGNITION), (*DATA PROCESSING, ELECTROOPTICS), COHERENT RADIATION, LASERS, IMAGE ORTHICONS, DETECTORS, VOCABULARY, SEARCH THEORY, INFORMATION THEORY

Subject Categories : Information Science

Distribution Statement : APPROVED FOR PUBLIC RELEASE