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Coherent Optical Implementation Of Generalized Two-Dimensional Transforms
Home
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Coherent Optical Implementation Of Generalized Two-Dimensional Transforms
Coherent Optical Implementation Of Generalized Two-Dimensional Transforms
James R. Leger
James R. Leger
SL
Sing H. Lee
Sing H. Lee
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8 December 1978
proceedings article
Published by
SPIE-Intl Soc Optical Eng
Vol. 154
,
210-218
https://doi.org/10.1117/12.938257
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.© (1978) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Keywords
TRANSFORM THEORY
LASERS
HOLOGRAPHY
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Cited by 4 articles