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4 January 2008 Application of JTC in recognition and real-time tracking of moving targets
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Traditional matched filter-based correlator needs to make matched filter in advance, which has many disadvantages, such as large calculation and slow speed. The more important thing is that it is not suitable for real-time processing and recognition precision is also very low. In this paper, the method of optical joint transform correlation (JTC) is presented, which can recognize targets in real time with higher precision. In JTC, Electricity Addressed Liquid Crystal Display (EALCD) is adopted as spatial light modulator, which has the feature of high resolution. It can record not only objects and images of optical system, but also joint image of target and template stored in computer beforehand. In the experimental system, EALCD is the key device to realize optical correlation. Two area array CCD are used to record the joint transform spectrum (JTS) and correlation peaks image respectively. By the coordinate of correlation peaks, the position of the target can be determined. Comparatively, stationary targets can be detected and recognized easily by JTC. When targets get moving, the intensity of the correlation peaks of joint image turns weak. Sometimes we even can't get them. Thus, an effective method is needed to solve the problem. In this paper, dynamic templates are applied to realize tracking the targets. Temporal state of targets will be used as new templates. According to the experiments, good tracking results are achieved.
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Yu Chen, Hua Miao, Wensheng Wang, and Qunxian Zhu "Application of JTC in recognition and real-time tracking of moving targets", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 683708 (4 January 2008);

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