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Proceedings Paper

Coherent Optical Implementation Of Generalized Two-Dimensional Transforms
Author(s): James R. Leger; Sing H. Lee
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Paper Abstract

A coherent optical method capable of performing arbitrary two-dimensional linear transformations has recently been studied, in which transform coefficients are given by two-dimensional inner products of the input image and a set of basis functions. Since the inner product of two functions is equal to the value of their correlation when there is zero shift between the functions, it is possible to use an optical correlator to solve for the coefficients of the transform. By using random phase masks in the input and the filter planes of the correlator, we have been able to pack many coefficients close together in the output plane, and thus take better advantage of the space-bandwidth product of the optical system. Both the input random phase mask and the spatial filter are computer-generated holographic elements, created by a computer-controlled laser beam scanner. The system can be "programmed" to perform arbitrary two-dimensional linear transformations. For demonstration, the set of two-dimensional Walsh functions was chosen as a transform basis. When the resolution of the Walsh functions was limited to 128 x 128, up to 256 transform coefficients were obtained in parallel. The signal-to-noise and accuracy of the transform coefficients were compared to the theory.

Paper Details

Date Published: 8 December 1978
PDF: 9 pages
Proc. SPIE 0154, Real-Time Signal Processing I, (8 December 1978);
Show Author Affiliations
James R. Leger, University of California (United States)
Sing H. Lee, University of California (United States)

Published in SPIE Proceedings Vol. 0154:
Real-Time Signal Processing I
T. F. Tao, Editor(s)

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