Monjur Mehjabin S, Tseng Shih, Fouda Mohamed F, Shahriar Selim M
Appl Opt. 2017 Apr 1;56(10):2754-2759. doi: 10.1364/AO.56.002754.
Optical target recognition using correlators is an important technique for fast verification and identification of images. The hybrid opto-electronic correlator (HOC) recently proposed by us bypasses the need for nonlinear materials such as photorefractive polymer films by using detectors instead, and the phase information is yet conserved by the interference of plane waves with the images. In this paper, we demonstrate experimentally the basic working principle of the HOC architecture using currently available technologies. For matched reference and query images, the output signal shows a sharp peak, indicating a match is found. For an unmatched case, a much lower peak value is observed, indicating no match. We also demonstrate the dependence of the output signal on the phases of the interfering plane waves and describe a technique using an interferometer and a servo for optimizing the output signal. As such, the work reported here paves the way for further development of the HOC for practical applications.
使用相关器进行光学目标识别是快速验证和识别图像的一项重要技术。我们最近提出的混合光电相关器（HOC）通过使用探测器取代了诸如光折变聚合物薄膜等非线性材料的需求，并且通过平面波与图像的干涉仍可保留相位信息。在本文中，我们利用现有技术通过实验证明了HOC架构的基本工作原理。对于匹配的参考图像和查询图像，输出信号显示出一个尖锐的峰值，表明找到了匹配项。对于不匹配的情况，则观察到一个低得多的峰值，表明没有匹配。我们还展示了输出信号对干涉平面波相位的依赖性，并描述了一种使用干涉仪和伺服系统来优化输出信号的技术。因此，本文所报道的工作为HOC在实际应用中的进一步发展铺平了道路。
