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Title: 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}
}