A non zero-order joint transform correlator using random phase function in the input plane

We propose a new technique to eliminate zero order in a joint transform correlator(JTC). In the proposed technique, the input target and reference images in a JTC are modulated by identical random phase functions. I;This results in a sharpening of the zero order as well as the correlation peak in the correlation plane. The zero order can be eliminated by subtracting a constant value from the joint power spectrum. The proposed non-zero order JTC. (NZJTC) has better discrimination ability than a conventional JTC(CJTC). A computer simulation study is presented to support the proposed technique.