Abstract

White-light Fourier processing techniques allow to improve the signal-to-noise ratio, to use non-laser sources, and, of course, to deal with color input signals. Nevertheless, conventional optical processing operations performed with broadband illumination are severally limited due to the wavelength dependence of the diffraction phenomenon. In this way, the Fraunhofer diffraction pattern of the input transparency is chromatic dispersed, both axial and laterally and, furthermore, the insertion of spatial filters at the frequency plane produces additional chromatic effects at the output plane.

© 1996 Optical Society of America