Abstract

In an effort to combine the advantages of optical information processing and the flexibility of digital computers, a real-time image subtraction system has been developed. A microcomputer is employed to control a Litton magnetooptic device (MOD) and also to interface the MOD to a video camera. The performance of the system in image subtraction is discussed in detail. An experimental demonstration of image subtraction is shown.

© 1986 Optical Society of America

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References

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  1. J. F. Ebersole, “Optical Image Subtraction,” Opt. Eng. 14, 436 (1975).
  2. S. H. Lee, S. K. Yao, A. G. Milnes, “Optical Image Synthesis (Complex Amplitude Addition and Subtraction) in Real Time by a Diffraction-Grating Interferometric Method,” J. Opt. Soc. Am. 60, 1037 (1970).
    [CrossRef]
  3. S. T. Wu, F. T. S. Yu, “Image Subtraction with Encoded Extended Incoherent Source,” Appl. Opt. 20, 4082 (1981).
    [CrossRef] [PubMed]
  4. F. T. S. Yu, Optical Information Processing (Wiley-Interscience, New York, 1983).
  5. W. E. Ross, D. Psaltis, R. H. Anderson, “Two-Dimensional Magneto-Optic Spatial Light Modulator for Signal Processing,” Opt. Eng. 22, 485 (1983).
    [CrossRef]

1983

W. E. Ross, D. Psaltis, R. H. Anderson, “Two-Dimensional Magneto-Optic Spatial Light Modulator for Signal Processing,” Opt. Eng. 22, 485 (1983).
[CrossRef]

1981

1975

J. F. Ebersole, “Optical Image Subtraction,” Opt. Eng. 14, 436 (1975).

1970

Anderson, R. H.

W. E. Ross, D. Psaltis, R. H. Anderson, “Two-Dimensional Magneto-Optic Spatial Light Modulator for Signal Processing,” Opt. Eng. 22, 485 (1983).
[CrossRef]

Ebersole, J. F.

J. F. Ebersole, “Optical Image Subtraction,” Opt. Eng. 14, 436 (1975).

Lee, S. H.

Milnes, A. G.

Psaltis, D.

W. E. Ross, D. Psaltis, R. H. Anderson, “Two-Dimensional Magneto-Optic Spatial Light Modulator for Signal Processing,” Opt. Eng. 22, 485 (1983).
[CrossRef]

Ross, W. E.

W. E. Ross, D. Psaltis, R. H. Anderson, “Two-Dimensional Magneto-Optic Spatial Light Modulator for Signal Processing,” Opt. Eng. 22, 485 (1983).
[CrossRef]

Wu, S. T.

Yao, S. K.

Yu, F. T. S.

Appl. Opt.

J. Opt. Soc. Am.

Opt. Eng.

J. F. Ebersole, “Optical Image Subtraction,” Opt. Eng. 14, 436 (1975).

W. E. Ross, D. Psaltis, R. H. Anderson, “Two-Dimensional Magneto-Optic Spatial Light Modulator for Signal Processing,” Opt. Eng. 22, 485 (1983).
[CrossRef]

Other

F. T. S. Yu, Optical Information Processing (Wiley-Interscience, New York, 1983).

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Figures (6)

Fig. 1
Fig. 1

Principle of real-time image subtraction using polarization-grating method.

Fig. 2
Fig. 2

Real-time programmable image subtractor.

Fig. 3
Fig. 3

Video data capture subsystem.

Fig. 4
Fig. 4

MOD drive interface.

Fig. 5
Fig. 5

System software: (a) flow chart of main program and (b) flow chart of subroutines.

Fig. 6
Fig. 6

Real-time subtracted results. Left- and right-hand images are the input object patterns; center parts are the subtracted images.

Equations (6)

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I 1 / I 0 = exp ( - α t ) K sin 2 ( 2 θ F t ) ,
I 2 / I 0 = exp ( - α t ) K sin 2 ( 2 θ F t + 90 ° ) .
F 1 = K 1 I 1 = K 1 ( I 2 + Δ I ) ,             0 I 1 1 ,
F 2 = K 1 ( 1 - I 2 ) ,             0 I 2 1 ,
ν = b / λ f ,
I = K 2 ( F 1 + F 2 ) = K 3 ( 1 + Δ I ) ,

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