Title page for ETD etd-12252002-234735

Type of Document Master's Thesis
Author Qi, Ying
Author's Email Address yiqi@vt.edu
URN etd-12252002-234735
Title Novel Optical Technique for Real-Time Pattern/Image Recognition
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Poon, Ting-Chung Committee Chair
Indebetouw, Guy J. Committee Member
Stolen, Roger Hall Committee Member
  • JTC
  • SLM
  • two-pupil heterodyne
Date of Defense 2002-12-12
Availability unrestricted
We propose a novel real-time joint-Transform correlation (JTC) technique for

optical pattern recognition.

To replace the film recording aspect of performing optical correlation,

conventional real-time joint-Transform correlation (JTC) optical systems make use of a

spatial light modulator (SLM) located in the Fourier plane to record the interference

intensity to achieve real-time processing. However, the use of a SLM in the Fourier

plane, is a major drawback in these systems since SLMs are limited in resolution, phase

uniformity and contrast ratio. Thus, they are not desirable for robust applications. In this

thesis, we developed a hybrid (optical/electronic) processing technique to achieve real-time

joint-Transform correlation (JTC). The technique employs acousto-optic

heterodyning scanning. The proposed real-time JTC system does not require a SLM in

the Fourier plane as in conventional real-time JTC systems. This departure from the

conventional scheme is extremely important, as the proposed approach does not depend

on SLM issues. We have developed the theory of the technique and substantiated it with

optical experimental as well as computer simulation results.

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