Wavelet-modified fringe-adjusted joint transform correlator

Alpana Bhagatji; Naveen K. Nishchal; Arun K. Gupta; B. P. Tyagi

doi:10.1117/12.697891

22 December 2006 Wavelet-modified fringe-adjusted joint transform correlator

Alpana Bhagatji, Naveen K. Nishchal, Arun K. Gupta, B. P. Tyagi

Proceedings Volume 6405, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications; 640513 (2006) https://doi.org/10.1117/12.697891
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

Abstract

In this paper, we implement a wavelet-modified fringe-adjusted joint transform correlator (JTC) for real-time target recognition applications. In real-time situation the input scene is captured using a CCD/thermal camera. The obtained joint power spectrum is multiplied with a pre-synthesized fringe-adjusted filter and the resultant function is processed with an appropriately scaled wavelet filter. The wavelet-modified fringe-adjusted JTC has been found to yield better results in comparison to the conventional fringe-adjusted JTC. To suppress the undesired strong dc, the resultant function is differentiated. Differential processing the wavelet-modified fringe-adjusted joint power spectrum removes the zero-order spectra and hence improves the detection efficiency. To focus the correlation terms in different planes in order to capture one of the desired autocorrelation peaks and discard the strong dc and another autocorrelation peak, chirp-encoding technique has also been applied. Computer simulation and experimental results are presented.

Citation Download Citation

Alpana Bhagatji, Naveen K. Nishchal, Arun K. Gupta, and B. P. Tyagi "Wavelet-modified fringe-adjusted joint transform correlator", Proc. SPIE 6405, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications, 640513 (22 December 2006); https://doi.org/10.1117/12.697891

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KEYWORDS

Wavelets

Target detection

Fourier transforms

Optical correlators

Joint transforms

Optical filters

CCD cameras

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