Abstract

We describe an image processing scheme that employs the principles of two-beam coupling in BaTiO₃ and the selective erasure of the FT hologram. The use of the FT of an erase beam makes the system more versatile in performing different operations with a single setup. An experimental demonstration has been performed by using two schemes, one with a counterpropagating erasure and the other with a copropagating erasure, to perform edge enhancement, bandpass filtering, and character recognition. The present system is real-time operational, energy efficient, and cascadable.

© 1992 Optical Society of America