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5 February 1990 Ternary Phase-Amplitude Filters For Character Recognition
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Ternary phase-amplitude filters (TPAF, encoding the modulation states -1, 0, and 1) are being developed for correlation both in theory and in practice. They are attractive due to their few discrete modulation levels which facilitate efficient electronic storage for on-line systems and allow implementation in real time with available spatial light modulators (SLMs), as recently demonstrated using magneto-optic devices. Simulations have demonstrated that effective smart TPAFs can be formulated to address class discrimination goals. We report experimental demonstration of significant increases in correlation discrimination achieved with TPAFs designed with the transform ratio technique. Results are in substantial agreement with theory based on computer simulations, and verify the practical implementation of improved discrete-level filters using magneto-optic SLMs.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Scott D. Lindell and David L. Flannery "Ternary Phase-Amplitude Filters For Character Recognition", Proc. SPIE 1151, Optical Information Processing Systems and Architectures, (5 February 1990);

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