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- W833712997 abstract "Pattern recognition is a rapidly expanding area of research, with applications rangingfrom character recognition and component inspection to robotic guidance and militaryreconnaissance. The basic principle of image recognition is that of comparing theunknown image with many known reference images or 'filters', until a match is found.By comparing the unknown image with a large data bank of filters, the diversity of theapplication can be extended. The work presented in this thesis details the practicaldevelopment of an optical disk based memory system as applied in various opticalcorrelators for pattern recognition purposes.The characteristics of the holographic optical disk as a storage medium areinvestigated in terms of information capacity and signal to noise ratio, where a fullyautomated opto-mechanical system has been developed for the control of the opticaldisk and the processing of the information recorded. A liquid crystal television hasbeen used as a Spatial Light Modulator for inputting the image data, and as such, thedevice characteristics have been considered with regard to processing both amplitudeand phase information. Three main configurations of optical correlator have beenapplied, specifically an image plane correlator, a VanderLugt correlator, and anAnamorphic correlator. Character recognition has been used to demonstrate correlatorperformance, where simple matched filtering has been applied, subsequent to which,an improvement in class discrimination has been demonstrated with the application ofthe Minimum Average Correlation Energy filter. The information processing rateobtained as a result of applying 2D parallel processing has been shown to be manyorders of magnitude larger than that available with comparable serial based digitalsystems." @default.
- W833712997 created "2016-06-24" @default.
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- W833712997 date "1997-01-01" @default.
- W833712997 modified "2023-09-27" @default.
- W833712997 title "Development of a parallel access optical disk system for high speed pattern recognition" @default.
- W833712997 hasPublicationYear "1997" @default.
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