Remove dc term and false alarms in fringe-adjusted joint transform correlator by using binary random phase mask

In this paper, we proposed a new architecture, called nonzero-order fringe-adjusted joint transform correlator (FJTC) using a binary random phase mask, for near real time pattern recognition applications. The binary random phase mask encodes the reference image by two equal probability phases before it is introduced in the joint input image. The joint power spectrum is then multiplied by the same phase mask to remove the zero-order term and false alarms that may be generated in the correlation plane due to the presence of multiple identical target or non-target objects in the input scene. The criteria used for measuring the performance of nonzero order fringe-adjusted JTC include correlation peak, intensity, peak-to-correlation energy, peak-to-sidelobe ratio are used in this paper. Detailed analysis for the proposed nonzero-order FJTC using binary random phase mask is presented. Simulation results verify the effectiveness of the proposed technique. (C) 2004 Elsevier B.V. All rights reserved.