SPATIAL ENVELOP-FREE NONLINEAR JOINT TRANSFORM CORRELATION

We present a simple procedure for removing the spatial envelop from th e joint power spectrum in a joint transform correlator. By using this procedure, an improvement in recognition capability is obtained. The m ain advantages of removing the spatial-envelop are the absence of redu ndant peaks, which occur when the joint power spectrum is binarized, a nd the simplicity of its implementation in comparison with spatial fil tering methods. Simulation and experimental results are provided.