An Experimental Investigation of the Vander Lugt Matched Filter System

摘要

Vander Lugt invented a method of optical matched filtering which combined the concept of the electrical matched filter and holographic recording of phase and amplitude of an object wave. This method of optical matched filtering lends itself to optical character recognition. This report describes the fabrication of a low cost Vander Lugt Matched Filter System which was built at the Quantum Electronics Research Laboratory at The University of Texas at Austin. The system is theoretically described, and then the actual system is described in detail. The effect of rotation of the input character with respect to the original recorded letter on the correlation spot is presented. Also, a method of controlling this effect is presented and experimentally demonstrated. Finally, a system evaluation and an improved method of the Vander Lugt Matched Filter System is presented. (Author)