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Novel Optical Technique for Real-Time Pattern/Image Recognition
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.