OPTICAL WAVELET FEATURE-EXTRACTION USING A MULTIPLE-INPUT PHASE-ONLY ENCODED JOINT-TRANSFORM CORRELATOR

We describe an optical joint-transform correlator (JTC) that uses phas e-only encoded inputs for multi-scale wavelet feature extraction. The analysis of the JTC is extended to multiple phase-only encoded inputs which allowed combinations of cross-correlations between input images to produce a multi-scale wavelet transform under certain conditions. L n addition, we compare the results of phase-encoding to that of amplit ude-encoding. Using multiple-input phase encoding allows feature extra ction to be performed with wavelets described in the spatial domain. ( C) 1998 Elsevier Science B.V. All rights reserved.