Abstract

We report on experiments using a slightly modified low-cost 128 × 128 pixel liquid-crystal television (LCTV) as a spatial light modulator (SLM) in the Fourier plane of an optical correlator. The LCTV usually displays a binary phase-only filter. A recently proposed holographic coding method enables the efficient coding of a complex 64 × 64 pixel filter on a 128 × 128 pixel SLM or LCTV. Translation- and rotation-invariant pattern recognition can be obtained by coding a circular harmonic filter by this method. Theoretical and experimental results will be shown.

© 1990 Optical Society of America