Application Of Digital Holograph In The Field Of Secure Identification

Currently, most optical lock keys are different from each other in the shape of work, the use of light reflection and refraction principle, so that makes in key generic process, as long as to imitate the shape of the keys and the optical characteristics of the surface, can be obtained.Therefore, this paper, based on the principle of optical interference optical lock, the key is copied difficult, a new technology applied to the optical lock, but also to crack the technical challenges. Using digital holographic optical information recording key, and then store the hologram, when the key is inserted again for image matching, to determine whether the locks open. In order to solve the problem of the stability of the optical lock, a seamless integration of fixed, effectively improve the stability of the system, the process of image matching characteristic matrix positioning to pan the image, and then were different levels of security image matching processing, the low security level directly with the phase correlation method for processing a high security level will be identified in the image grid, small images will be obtained with the correlation calculation to the reference image, and then the obtained but also improve the results of the statistics, the statistical result with a threshold value, determine whether the locks open, so that effective use of the entire information of the hologram, instead of using part of the feature comparison identification and improve the accuracy of identification of the holographic the key is to imitate and copy of difficulty. Has been successfully completed in the laboratory the optical lock the entire optical process, to verify the feasibility of this scheme.