Abstract

Recently, many uses of liquid crystal television (LCTV) in real-time signal processing have been reported. The joint transform architecture is an alternative approach to optical pattern recognition. The joint transform method has proved suitable for adaptive programmable correlation because no matched spatial filter is required. The reference pattern may simply be generated by a computer and input to a low space-bandwidth product, electronically addressed spatial light modulator. Conversely, it is very difficult to generate a dynamic Fourier plane VanderLugt-type complex-matched spatial filter. A new implementation of the real-time joint transform correlator architecture using inexpensive LCTVs is discussed. A color LCTV consisting of three primary color pixels is also investigated to perform real-time color pattern recognition based on joint transform architecture.

© 1987 Optical Society of America