Abstract
Simple grating filters such as rectangular and triangular ones are used in a two non-conventional real-time joint-transform correlation (JTC) architectures to eliminate the spatial light modulators (SLM) at the Fourier planes of a conventional JTC. In the first one, the grating filter is used along with a heterodyning and one-dimensional optical scanning techniques to capture the cross-correlation functions of the input images without major processing. This significantly reduces the time processing needed for real-time applications by eliminating the drawbacks of the non-ideal characteristics of the SLMs. In the second technique, the one-dimensional optical scanning is eliminated to achieve a faster (but a little bit more complicated) processing.