Optical ranked-order filtering using threshold decomposition
Abstract
A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed.
- Inventors:
-
- West Lafayette, IN
- Pleasanton, CA
- Alamo, CA
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 867499
- Patent Number(s):
- 4949389
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G03 - PHOTOGRAPHY G03H - HOLOGRAPHIC PROCESSES OR APPARATUS
G - PHYSICS G06 - COMPUTING G06E - OPTICAL COMPUTING DEVICES
- DOE Contract Number:
- AC04-76
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- optical; ranked-order; filtering; threshold; decomposition; hybrid; electronic; performs; median; related; operations; encode; image; transforms; nonlinear; neighborhood; ranking; operation; linear; space-invariant; step; followed; point-to-point; comparison; spatial; multiplexing; allows; parallel; processing; components; recombination; incoherent; correlation; magneto-optic; light; modulator; input; device; computer-generated; hologram; filter; plane; thresholding; electronically; adjusting; value; architecture; perform; minimum; maximum; images; totally; disclosed; light modulator; parallel processing; threshold decomposition; input device; coherent optical; hybrid optical; parallel process; linear filter; /382/359/
Citation Formats
Allebach, Jan P, Ochoa, Ellen, and Sweeney, Donald W. Optical ranked-order filtering using threshold decomposition. United States: N. p., 1990.
Web.
Allebach, Jan P, Ochoa, Ellen, & Sweeney, Donald W. Optical ranked-order filtering using threshold decomposition. United States.
Allebach, Jan P, Ochoa, Ellen, and Sweeney, Donald W. Mon .
"Optical ranked-order filtering using threshold decomposition". United States. https://www.osti.gov/servlets/purl/867499.
@article{osti_867499,
title = {Optical ranked-order filtering using threshold decomposition},
author = {Allebach, Jan P and Ochoa, Ellen and Sweeney, Donald W},
abstractNote = {A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}