SGER: Photo Polymer Based Optical Pattern Recognition for Security Verification

9523759 Javidi信用卡诈骗是许多银行、企业和消费者面临的严重问题。此外，计算机芯片、光盘和名牌时装等假冒产品正大量涌入我们的海岸。随着计算机、CCD技术、图像处理硬件和软件、打印机、扫描仪和复印机的快速发展，复制图片、标志、符号、纸币或图案变得越来越容易。信用卡和护照目前使用全息图作为一种安全措施，以阻止复制。但技术已经进步到了可以很容易地从信用卡上获得全息图像的地步--以及使用商业上可获得的光学元件或全息图生产设备合成的新全息图。我们提出了一种新的系统，用于对信用卡、护照和其他身份证进行安全验证，从而使它们不易被复制。该系统使用了一种新的复杂相位/幅度模式，这种模式不能被强度敏感探测器(如ccd相机)看到，也不能复制。基本思想是将随机相位掩模永久且不可挽回地绑定到主要识别图案，例如指纹、脸部照片或签名。为了获得更高的安全性，还可以对主图案进行相位编码，从而形成非常安全的系统。在光学系统中可以识别随机位相掩模和主图案两者。***

9523759 Javidi Credit card fraud is a serious problem facing many banks, businesses, and consumers. In addition, counterfeit products such as computer chips, compact discs, and designer fashions, are arriving on our shores in great numbers. With the rapid advances in computers, CCD technology, image processing hardware and software, printers, scanners, and copiers, it is becoming increasingly easy to reproduce pictures, logos, symbols, paper currency, or patterns. Credit cards and passports currently use holograms as a security measure to thwart copying. But technology has advanced to the point where the holographic image can be easily acquired from a credit card - and a new hologram synthesized using commercially available optical components or hologram-producing equipment. We propose a novel system for security verification of credit cards, passports, and other IDs so that they cannot easily be reproduced. The system uses a new scheme of complex phase/amplitude patterns that cannot be seen and cannot be copied by an intensity-sensitive detector such as a CCD camera. The basic idea is to permanently and irretrievably bond a random phase mask to a primary identification pattern such as a fingerprint, a picture of a face, or a signature. For additional security, the primary pattern could also be phase encoded which results in a very secure system. Both the random phase mask and the primary pattern are identifiable in an optical system. ***