计算全息技术在光学相关识别中的应用

Application of computer generated hologram technology in optical correlation recognition system

为了实现光相关匹配滤波系统的小型化、集成化,采用纯计算全息技术,构建了一个光学相关识别系统。理论分析和实验验证表明,用计算全息透镜代替傅里叶透镜制得的复数滤波器,集成了4f系统中第2个傅里叶变换透镜的作用,滤波器后面不再用傅里叶透镜。这样减少了光学元件,同时缩短了光路。结果表明,该系统和4f光学相关识别系统一样,能够进行相关识别且具有平移不变性。

In order to realize the miniaturization and integration of the optical correlation recognition system, an optical correlation recognition system was proposed with the help of computer generated hologram （CGH）. Theory analysis and experimental results show that complex filter made of CGH instead of Fourier lens, integrates the second Fourier lens in the 4f system. So there is no need of Fourier lens behind the complex filter. The system has reduced the optics component, simplified optical section at the same time. It also has the character of shift invariability as 4f optical correlation recognition system and can be used as optical correlation recognition system.