SGER: Photo Polymer Based Optical Pattern Recognition for Security Verification

信用卡诈骗是许多银行、企业和消费者面临的一个严重问题。此外，诸如电脑芯片、光盘和名牌时装等假冒产品正大量涌入我国。随着计算机、CCD技术、图像处理硬件和软件、打印机、扫描仪和复印机的迅速发展，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防止复制的安全措施。但是，技术已经发展到可以很容易地从信用卡上获取全息图像的地步，并且可以使用市售的光学元件或全息图生产设备合成新的全息图。我们提出了一种新的信用卡、护照和其他身份证件的安全验证系统，使它们不能轻易被复制。该系统采用了一种复杂相位/振幅模式的新方案，这种模式不能被强度敏感探测器（如CCD相机）看到和复制。其基本思想是将随机相位掩码永久且不可挽回地绑定到主要识别模式（如指纹、面部照片或签名）上。为了增加安全性，主模式也可以进行相位编码，从而使系统非常安全。在光学系统中，随机相位掩模和主模都是可识别的。* * *

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. ***