<title>Access-control holographic system based on joint transform correlator and image encoding</title>

Abstract

ABSTRACT New lay-out for the access control system based on joint transform correlator (JTC) is presented. The carrier-key shouldconsists of several tested holograms. Each of the holograms stores a part of entire image, stored in the reference hologram.Image domain JTC is used to match the images retrieved from the holograms. Being recorded and retrieved, the imagesprovides correlation peaks with special positions, with a strict dependence on the tested and reference holograms mutualshifts. The optical signal transforming is considered by means of mathematical analysis. The experimental resultscorresponded with computer simulations are presented.Keywords: access control, joint transform correlator, image recognizing, image encoding, holographic security, securityverification. 1. INTRODUCTION The access control to rooms, objects and information resources is a serious problem now. Program and hardware solutionsfor it are actively explored and are developed. The main operation principle of such systems is the follows: a personrequesting for access, inlets a certain information into the system, (“the key”), where it is compared to other informationtermed usually as “the reference”. Depending on correspondence of the key and the reference the system produces a signal.An executive device interprets the signal as a command to accept or refuse from an access.This is the way for all the existing access control devices. The distinctions between them consist in a physical nature of usedsignals and information carriers, methods of encoding, decoding and matching of a key and reference and automation level.The systems with using of optical and electrical signals both realizing operations of encoding - decoding and matching withoptical correlators and Fourier processors, are actively explored now