Abstract

A pattern recognition system that uses incoherent spatial filtering to recognize images directly from a narrowband phosphor television monitor is described. Images of real objects are captured with a television camera. These images are then edge-enhanced electronically and displayed on the TV monitor. The monitor output is used directly as the input to a holographic correlator. An optical multichannel analyzer at the correlation plane is used to analyze the shape of the correlation function and to determine the position of its peak. Experimental results agree well with theory. Concepts for handling rotation, aspect angle, and scale variations of the input are discussed.

© 1983 Optical Society of America

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References

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  1. J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, 1968), p. 141.
  2. B. Guenther, C. R. Christensen, J. Upatnieks, IEEE J. Quantum Electron. QE-15, 1348 (1979).
    [CrossRef]
  3. P. M. Duffieux, in Principles of Optics, G. Born, E. Wolf, Eds. (Pergamon, New York, 1964), p. 485.
  4. J. D. Armitage, A. W. Lohmann, Appl. Opt. 4, 461 (1965).
    [CrossRef]
  5. A. W. Lohmann, Appl. Opt. 7, 561 (1968).
    [CrossRef]
  6. S. Lowenthal, A. Wertz, C. R. Acad. Sci. Ser. B 266, 542 (1968).
  7. A. W. Lohmann, W. H. Werlich, Appl. Opt. 10, 670 (1971).
    [CrossRef] [PubMed]
  8. W. T. Maloney, Appl. Opt. 10, 2554 (1971).
    [CrossRef] [PubMed]
  9. G. M. Morris, N. George, Opt. Lett. 5, 202 (1980).
    [CrossRef] [PubMed]
  10. G. M. Morris, N. George, Opt. Lett. 5, 446 (1980).
    [CrossRef] [PubMed]
  11. J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, 1968), p. 113.

1980 (2)

1979 (1)

B. Guenther, C. R. Christensen, J. Upatnieks, IEEE J. Quantum Electron. QE-15, 1348 (1979).
[CrossRef]

1971 (2)

1968 (2)

A. W. Lohmann, Appl. Opt. 7, 561 (1968).
[CrossRef]

S. Lowenthal, A. Wertz, C. R. Acad. Sci. Ser. B 266, 542 (1968).

1965 (1)

Armitage, J. D.

Christensen, C. R.

B. Guenther, C. R. Christensen, J. Upatnieks, IEEE J. Quantum Electron. QE-15, 1348 (1979).
[CrossRef]

Duffieux, P. M.

P. M. Duffieux, in Principles of Optics, G. Born, E. Wolf, Eds. (Pergamon, New York, 1964), p. 485.

George, N.

Goodman, J. W.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, 1968), p. 113.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, 1968), p. 141.

Guenther, B.

B. Guenther, C. R. Christensen, J. Upatnieks, IEEE J. Quantum Electron. QE-15, 1348 (1979).
[CrossRef]

Lohmann, A. W.

Lowenthal, S.

S. Lowenthal, A. Wertz, C. R. Acad. Sci. Ser. B 266, 542 (1968).

Maloney, W. T.

Morris, G. M.

Upatnieks, J.

B. Guenther, C. R. Christensen, J. Upatnieks, IEEE J. Quantum Electron. QE-15, 1348 (1979).
[CrossRef]

Werlich, W. H.

Wertz, A.

S. Lowenthal, A. Wertz, C. R. Acad. Sci. Ser. B 266, 542 (1968).

Appl. Opt. (4)

C. R. Acad. Sci. Ser. B (1)

S. Lowenthal, A. Wertz, C. R. Acad. Sci. Ser. B 266, 542 (1968).

IEEE J. Quantum Electron. (1)

B. Guenther, C. R. Christensen, J. Upatnieks, IEEE J. Quantum Electron. QE-15, 1348 (1979).
[CrossRef]

Opt. Lett. (2)

Other (3)

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, 1968), p. 113.

P. M. Duffieux, in Principles of Optics, G. Born, E. Wolf, Eds. (Pergamon, New York, 1964), p. 485.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, San Francisco, 1968), p. 141.

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Figures (9)

Fig. 1
Fig. 1

VanderLugt Filter System.

Fig. 2
Fig. 2

An incoherent system.

Fig. 3
Fig. 3

Theoretical plot comparing intensity autocorrelation produced by incoherent system with the intensity response of a coherent system (for identical images).

Fig. 4
Fig. 4

Optical system layout for making spatial filters.

Fig. 5
Fig. 5

Comparison of theoretical and experimental (using laser light that has been passed through a rotating diffuser) correlation functions.

Fig. 6
Fig. 6

Comparison of theoretical and experimental (using TV image as input) correlation functions.

Fig. 7
Fig. 7

Autocorrelation and cross correlations superimposed.

Fig. 8
Fig. 8

Tracking ability of correlation peak with object location.

Fig. 9
Fig. 9

Hybrid incoherent optical pattern recognition system.

Equations (4)

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g ( x , y ) = h ( x , y ) * f ( x , y ) ,
G ( u , υ ) = H ( u , υ ) F ( u , υ ) ,
| g ( x , y ) | 2 = k | h ( x , y ) | 2 * | f ( x , y ) | 2
g ( x , y ) = k h ( x , y ) * f ( x , y ) .

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