Abstract

An image-processing technique based on temporal coherence differences in a scene is described. Resultant processed images are presented that demonstrate an increase in the signal-to-clutter ratio of the order of 102 for a He–Ne laser in a white-light background (FWHM 200 nm). Problems of processing speed, dynamic range, and image misalignment are addressed. Modifications in both the optical design and electronic signal processing are proposed. Comparison with nonimaging experiments indicates that signal-to-clutter gains approaching 108 are feasible.

© 1988 Optical Society of America

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References

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  1. E. V. Loewenstein, in Aspen International Conference on Fourier Spectroscopy, 1970, G. A. Vanasse, A. T. Stair, D. J. Baker, eds. (Air Force Cambridge Research Laboratory, Bedford, Mass., 1971), p. 3.
  2. D. Hickman, J. Phys. E 21, 187 (1988).
    [CrossRef]
  3. G. Shepherd, W. A. Gault, D. Miller, Z. Pasturczyk, S. Johnston, P. R. Kosteniuk, J. W. Haslett, D. J. Kendall, J. R. Wimperis, Appl. Opt. 24, 1571 (1985).
    [CrossRef] [PubMed]

1988

D. Hickman, J. Phys. E 21, 187 (1988).
[CrossRef]

1985

Gault, W. A.

Haslett, J. W.

Hickman, D.

D. Hickman, J. Phys. E 21, 187 (1988).
[CrossRef]

Johnston, S.

Kendall, D. J.

Kosteniuk, P. R.

Loewenstein, E. V.

E. V. Loewenstein, in Aspen International Conference on Fourier Spectroscopy, 1970, G. A. Vanasse, A. T. Stair, D. J. Baker, eds. (Air Force Cambridge Research Laboratory, Bedford, Mass., 1971), p. 3.

Miller, D.

Pasturczyk, Z.

Shepherd, G.

Wimperis, J. R.

Appl. Opt.

J. Phys. E

D. Hickman, J. Phys. E 21, 187 (1988).
[CrossRef]

Other

E. V. Loewenstein, in Aspen International Conference on Fourier Spectroscopy, 1970, G. A. Vanasse, A. T. Stair, D. J. Baker, eds. (Air Force Cambridge Research Laboratory, Bedford, Mass., 1971), p. 3.

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Figures (5)

Fig. 1
Fig. 1

The Twyman–Green interferometer.

Fig. 2
Fig. 2

Input image used in the evaluation. The overall scene was illuminated by a white-light source. A He–Ne laser signal was reflected off the tank in the foreground and is located at the coordinates (Sx, Sy).

Fig. 3
Fig. 3

The intensity plot of the input image.

Fig. 4
Fig. 4

Output from the temporal coherence processing system. The intensity of the image has been enhanced to highlight the image component.

Fig. 5
Fig. 5

The intensity plot of the processed image.

Equations (4)

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l B < x 0 < l S ,
S / C ( x ) = S / C ( 0 ) G m ( x ) F g R ( ν ) ,
G m ( x ) = M S ( x ) M B ( x ) .
g ( x ) = S / C ( x ) S / C ( 0 ) = G m ( x ) F g R ( ν ) .

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