Optical Verification System Based on a Correlator Using Image Manipulations as Locks

Most of optical security systems have a fixed lock and multiple keys to validate whether special users are legal or illegal. but those systems will be failed under the situation when the right keys are stolen by illegal users. This problem can be solved by providing multiple locks for the different users who want to access the optical security system. Therefore, a novel optical verification system based on a 4-f correlator combining with a lock database is proposed in this paper to enhance the security capability. Those locks in the lock database are generated by using multiple parameters, such as the image of organization logo, image compression format, image scaling factor, and image interpolation method. Only the user that knows the correct parameters described above and owns the right key can retrieve the corresponding lock from the lock database and has the ability to pass the verification of the security system.