Abstract

An autofocusing mechanism based on the concept of autocorrelation is described. The method may be performed optically with ring detectors in the Fourier domain or electronically with a special computing chip or software.

© 1994 Optical Society of America

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References

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  1. R. E. Jacobson, S. F. Ray, G. G. Attridge, The Manual of Photography, 8th ed. (Focal, London, 1988), pp. 113–117.
  2. N. Goldberg, Camera Technology (Academic, Boston, Mass., 1992), Chap. 1, pp. 1–50.
  3. F. T. S. Yu, S. Jutamulia, Optical Signal Processing, Computing, and Neural Networks (Wiley, New York, 1992), Chap. 5, pp. 160–202.
  4. C. S. Weaver, J. W. Goodman, “A technique for optically convolving two functions,” Appl. Opt. 5, 1248–1249 (1966).
    [CrossRef] [PubMed]
  5. S. Jutamulia, “Joint transform correlators and their applications,” in Optical Computing and Neural Networks, K.-Y. Hsu, H.-K. Liu, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1812, 233–243 (1992).
  6. G. G. Lendaris, G. L. Stanley, “Diffraction-pattern sampling for automatic pattern recognition,” Proc. IEEE 58, 198–216 (1970).
    [CrossRef]
  7. H. L. Kasdan, “Industrial applications of diffraction pattern sampling,” Opt. Eng. 18, 496–503 (1979).

1979 (1)

H. L. Kasdan, “Industrial applications of diffraction pattern sampling,” Opt. Eng. 18, 496–503 (1979).

1970 (1)

G. G. Lendaris, G. L. Stanley, “Diffraction-pattern sampling for automatic pattern recognition,” Proc. IEEE 58, 198–216 (1970).
[CrossRef]

1966 (1)

Attridge, G. G.

R. E. Jacobson, S. F. Ray, G. G. Attridge, The Manual of Photography, 8th ed. (Focal, London, 1988), pp. 113–117.

Goldberg, N.

N. Goldberg, Camera Technology (Academic, Boston, Mass., 1992), Chap. 1, pp. 1–50.

Goodman, J. W.

Jacobson, R. E.

R. E. Jacobson, S. F. Ray, G. G. Attridge, The Manual of Photography, 8th ed. (Focal, London, 1988), pp. 113–117.

Jutamulia, S.

F. T. S. Yu, S. Jutamulia, Optical Signal Processing, Computing, and Neural Networks (Wiley, New York, 1992), Chap. 5, pp. 160–202.

S. Jutamulia, “Joint transform correlators and their applications,” in Optical Computing and Neural Networks, K.-Y. Hsu, H.-K. Liu, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1812, 233–243 (1992).

Kasdan, H. L.

H. L. Kasdan, “Industrial applications of diffraction pattern sampling,” Opt. Eng. 18, 496–503 (1979).

Lendaris, G. G.

G. G. Lendaris, G. L. Stanley, “Diffraction-pattern sampling for automatic pattern recognition,” Proc. IEEE 58, 198–216 (1970).
[CrossRef]

Ray, S. F.

R. E. Jacobson, S. F. Ray, G. G. Attridge, The Manual of Photography, 8th ed. (Focal, London, 1988), pp. 113–117.

Stanley, G. L.

G. G. Lendaris, G. L. Stanley, “Diffraction-pattern sampling for automatic pattern recognition,” Proc. IEEE 58, 198–216 (1970).
[CrossRef]

Weaver, C. S.

Yu, F. T. S.

F. T. S. Yu, S. Jutamulia, Optical Signal Processing, Computing, and Neural Networks (Wiley, New York, 1992), Chap. 5, pp. 160–202.

Appl. Opt. (1)

Opt. Eng. (1)

H. L. Kasdan, “Industrial applications of diffraction pattern sampling,” Opt. Eng. 18, 496–503 (1979).

Proc. IEEE (1)

G. G. Lendaris, G. L. Stanley, “Diffraction-pattern sampling for automatic pattern recognition,” Proc. IEEE 58, 198–216 (1970).
[CrossRef]

Other (4)

R. E. Jacobson, S. F. Ray, G. G. Attridge, The Manual of Photography, 8th ed. (Focal, London, 1988), pp. 113–117.

N. Goldberg, Camera Technology (Academic, Boston, Mass., 1992), Chap. 1, pp. 1–50.

F. T. S. Yu, S. Jutamulia, Optical Signal Processing, Computing, and Neural Networks (Wiley, New York, 1992), Chap. 5, pp. 160–202.

S. Jutamulia, “Joint transform correlators and their applications,” in Optical Computing and Neural Networks, K.-Y. Hsu, H.-K. Liu, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1812, 233–243 (1992).

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Figures (4)

Fig. 1
Fig. 1

Schematic diagram of an optical autocorrelator.

Fig. 2
Fig. 2

Autocorrelation based on a joint transform correlator.

Fig. 3
Fig. 3

Schematic diagram of ring detectors. r 1 is the ring detector with the smallest radius.

Fig. 4
Fig. 4

(a) Well-focused image of a fingerprint, (b) the power spectra of (a), (c) a blurred image of the fingerprint, (d) the power spectra of (c).

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