<title>Implementation of ID card system using optodigital information hiding scheme</title>

Abstract

In this paper, a new ID card system based-on the digital information hiding and optical extraction technique is suggested and implemented. In the information-hiding process, stego keys are digitally generated by using 2-D PRS and used to hide some specific data related to the card holders into their digital photo-image (cover image) in order to verify the ID cards. To extract the hidden data from the photo-image (stego image) in real-time, a matched filter-based optical correlator system is introduced. Optical correlation between the input stego image and the stego keys in the matched filter bank makes the sharp correlation peaks in the correlation plane only if the stego key hidden in the stego image is identically same with the stego key stored in the matched filter bank. This correlation peak signals and its position data can be used for verification of the ID card. In the experiment, a cover image of Lena is divided into 10 x 7 blocks and then, the stego key consisting of 64 x 64 pixels selected from 50 valid stego keys is embedded into the 3 different blocks of the cover image. Through the optical correlation between the Lena stego image and its valid stego key, resultant three correlation outputs and their position data are finally used for authentication. From these experimental results, a possibility of implementing a new ID card verification system using opto-digital information hiding and extraction scheme is suggested.© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.