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. 3 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Sandia National Labs., Albuquerque, NM (USA)
- OSTI Identifier:
- 6866284
- Patent Number(s):
- -US-A6106295
- Assignee:
- SNL; EDB-88-179306
- DOE Contract Number:
- AC04-76DP00789
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; OPTICAL FILTERS; DESIGN; DIGITAL FILTERS; FOURIER TRANSFORMATION; IMAGE PROCESSING; INVENTIONS; FILTERS; INTEGRAL TRANSFORMATIONS; PROCESSING; TRANSFORMATIONS 440300* -- Miscellaneous Instruments-- (-1989)
Citation Formats
Allebach, J.P., Ochoa, E., and Sweeney, D.W. Optical ranked-order filtering using threshold decomposition. United States: N. p., 1987.
Web.
Allebach, J.P., Ochoa, E., & Sweeney, D.W. Optical ranked-order filtering using threshold decomposition. United States.
Allebach, J.P., Ochoa, E., and Sweeney, D.W. Fri .
"Optical ranked-order filtering using threshold decomposition". United States.
@article{osti_6866284,
title = {Optical ranked-order filtering using threshold decomposition},
author = {Allebach, J.P. and Ochoa, E. and Sweeney, D.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. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {10}
}