Fourier plane processing for the joint transform correlator: windows and time modulation

Thomas J. Grycewicz

doi:10.1117/12.187284

29 September 1994 Fourier plane processing for the joint transform correlator: windows and time modulation

Thomas J. Grycewicz

Proceedings Volume 2297, Photonics for Processors, Neural Networks, and Memories II; (1994) https://doi.org/10.1117/12.187284
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

With recent advances in the state-of-the-art in spatial light modulators, the optical joint transform correlator and binary joint transform correlator are becoming practical signal processing systems. However, the performance of these devices is severely limited because of the dominance of the reference and scene autocorrelation signals in the output plane. Two major problems caused by this are false correlations between multiple targets and low correlation peak amplitudes. Two recently proposed techniques which reduced or eliminate the autocorrelation signals are Fourier plane windowing and time modulation (or frame subtraction). This paper shows how these techniques can be used separately or together to improve binary joint transform correlator performance. In simulation, the two techniques provided peak to noise improvements of 2.5 and 5.5 dB over binarization based on using a uniform threshold. The improvement gained by combining the techniques was 6.6 dB.

Citation Download Citation

Thomas J. Grycewicz "Fourier plane processing for the joint transform correlator: windows and time modulation", Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); https://doi.org/10.1117/12.187284

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