Target tracking using nonlinear reference phase-encoded joint transform correlation

Mohammed Nazrul Islam; Vijayan K. Asari; Mohammad A. Karim; Mohammad S. Alam

doi:10.1117/12.919786

23 April 2012 Target tracking using nonlinear reference phase-encoded joint transform correlation

Mohammed Nazrul Islam, Vijayan K. Asari, Mohammad A. Karim, Mohammad S. Alam

Proceedings Volume 8398, Optical Pattern Recognition XXIII; 83980B (2012) https://doi.org/10.1117/12.919786
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

Optical joint transform correlation (JTC) has been proven to be an efficient pattern recognition tool, especially, for real-time applications. However, the classical JTC suffers from a lot of limitations such as broad correlation peaks, large side lobes, duplicate correlation peaks and low discrimination between target and non-target objects. This paper proposes a nonlinear JTC based target detection and tracking technique, where the reference image is phase-shifted and phase-encoded and then fed to two parallel processing channels. Each channel introduces the unknown input scene and performs Fourier transformations to obtain the joint power spectra signals, which are then combined and phase-encoded. Then a nonlinear operation is performed on the modified power spectrum followed by the application of fringe-adjusted filtering operation. A subsequent inverse Fourier transform operation yields the correlation output containing a highly distinct peak corresponding to each target present in the input scene. The reference image phase-encoding process removes any overlapping issue among the input scene objects, which is a drawback of classical JTC technique. An updated decision criterion is developed for the correlation plane so that it can accurately identify the location of the target. The proposed pattern recognition technique offers an excellent alternative for target tracking in an unknown video sequence.

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Mohammed Nazrul Islam, Vijayan K. Asari, Mohammad A. Karim, and Mohammad S. Alam "Target tracking using nonlinear reference phase-encoded joint transform correlation", Proc. SPIE 8398, Optical Pattern Recognition XXIII, 83980B (23 April 2012); https://doi.org/10.1117/12.919786

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KEYWORDS

Target detection

Joint transforms

Fourier transforms

Nonlinear filtering

Image processing

Optical filters

Nonlinear optics

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