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Proceedings Paper

Intensity-To-Spatial Frequency Transformations In Optical Signal Processing
Author(s): A. A. Sawchuk; T. C. Strand; B. H. Soffer
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Paper Abstract

Abstract. Intensity-to-spatial frequency transformations can be exploited for a variety of useful optical information processing operations. Resolution elements of an image are encoded with a grating structure whose spatial frequency and/or orientation is a function of the local image intensity. Assuming that certain sampling requirements are met, each intensity level is assigned to a different point in Fourier space. Various schemes of spatial filtering can then be used to alter the relative intensity levels. The procedure can be used for nonlinear analog point transformations and for numerical processing using binary or residue arithmetic. Theta modulation and frequency modulation are special cases of the technique. Off-line methods for implementing intensity-to-spatial frequency transformations include halftoning and grating techniques; real-time methods include new electro-optical systems such as the variable-grating-mode (VGM) liquid crystal devices. Details of these devices and experimental results are presented.

Paper Details

Date Published: 27 February 1984
PDF: 8 pages
Proc. SPIE 0373, Transformations in Optical Signal Processing, (27 February 1984); doi: 10.1117/12.934536
Show Author Affiliations
A. A. Sawchuk, University of Southern California (United States)
T. C. Strand, University of Southern California (United States)
B. H. Soffer, Hughes Research Laboratories (United States)

Published in SPIE Proceedings Vol. 0373:
Transformations in Optical Signal Processing
William T. Rhodes; James R. Fienup; Bahaa Saleh, Editor(s)

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