HIGH-EFFICIENCY HYBRID JOINT TRANSFORM CORRELATOR WITH PRE-PROCESSED INPUT IMAGE AND REPLICATED BINARY SPECTRUM ARRAY

The performance of a hybrid joint transform correlator (JTC) is improv ed by the input image pre-processing method and our proposed spectrum binarizing and replicating technique. The input image pre-processing c an enhance the correlation discrimination ability of a JTC system, and the replication of the binary spectrum under an appropriate condition can further substantially increase the light efficiency, the maximum correlation peak intensity, the peak sharpness and the signal-to-noise ratio of the system at the same time by the mechanics of constructive interference. Theoretical analyses are presented. Both the computer s imulation and optical experiment verifying the effectiveness of this t echnique are also given.