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Proceedings Paper

Ternary Phase-Amplitude Filters For Character Recognition
Author(s): Scott D. Lindell; David L. Flannery
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Paper Abstract

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.

Paper Details

Date Published: 5 February 1990
PDF: 9 pages
Proc. SPIE 1151, Optical Information Processing Systems and Architectures, (5 February 1990); doi: 10.1117/12.962217
Show Author Affiliations
Scott D. Lindell, The University of Dayton Research Institute (United States)
David L. Flannery, The University of Dayton Research Institute (United States)

Published in SPIE Proceedings Vol. 1151:
Optical Information Processing Systems and Architectures
Bahram Javidi, Editor(s)

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