Optical ranked-order filtering using threshold decomposition

Allebach, Jan P; Ochoa, Ellen; Sweeney, Donald W

Title: Optical ranked-order filtering using threshold decomposition

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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:

Allebach, Jan P ^[1]; Ochoa, Ellen ^[2]; Sweeney, Donald W ^[3]

West Lafayette, IN
Pleasanton, CA
Alamo, CA

Issue Date:: 1990-01-01

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 G06K - RECOGNITION OF DATA

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G - PHYSICS G03 - PHOTOGRAPHY G03H - HOLOGRAPHIC PROCESSES OR APPARATUS
G03H1/0841 - {Encoding method mapping the synthesized field into a restricted set of values representative of the modulator parameters, e.g. detour phase coding}
G03H2001/0066 - {for wavefront matching wherein the hologram is arranged to convert a predetermined wavefront into a comprehensive wave, e.g. associative memory

G - PHYSICS G06 - COMPUTING G06K - RECOGNITION OF DATA
G06K9/58 - using optical means

G - PHYSICS G06 - COMPUTING G06E - OPTICAL COMPUTING DEVICES
G06E3/00 - Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data

G - PHYSICS G03 - PHOTOGRAPHY G03H - HOLOGRAPHIC PROCESSES OR APPARATUS
G03H1/0808 - {Methods of numerical synthesis, e.g. coherent ray tracing [CRT], diffraction specific}

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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/

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                    Allebach, Jan P, Ochoa, Ellen, and Sweeney, Donald W. Optical ranked-order filtering using threshold decomposition.  United States: N. p., 1990. 
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                    Allebach, Jan P, Ochoa, Ellen, & Sweeney, Donald W. Optical ranked-order filtering using threshold decomposition.  United States.

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                    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.

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@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         = {1990},

  month        = {1}

}

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