Abstract

Character recognition experiments, carried out with reflection matched filters, are described. The reflection filters are obtained by means of volume holograms, recorded in photographic emulsion and suitably processed. These filters allow a good discrimination among similar characters and exhibit large positioning tolerances. They turn out to be well comparable with transmission hologram filters. An advantage of reflection filters is that the filtering operation can be performed with one-lens processor, thus reducing by one-half the size and the cost of the processor.

© 1974 Optical Society of America

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References

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  1. J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968).
  2. G. Groh, in Optical and Acoustical Holography, E. Camatini, Ed. (Plenum Press, New York, 1972), pp. 71–110.
    [CrossRef]
  3. G. W. Stroke, in Optical and Acoustical Holography, E. Camatini, Ed. (Plenum Press, New York, 1972), pp. 411–426.
    [CrossRef]
  4. W. T. Cathey, J. Opt. Soc. Am. 55, 457 (1965).
    [CrossRef]
  5. C. B. Burckhardt, J. Opt. Soc. Am. 58, 1551 (1968).
  6. J. Upatnieks, C. Leonard, Appl. Opt. 8, 85 (1969).
    [CrossRef] [PubMed]
  7. K. S. Pennington, J. S. Harper, Appl. Opt. 9, 1643 (1970).
    [CrossRef] [PubMed]
  8. G. C. Righini, V. Russo, S. Sottini, Appl. Opt. 11, 951 (1972).
    [CrossRef] [PubMed]
  9. Yu.N. Denisyuk, I. R. Protas, Opt. Spectrosc. 14, 381 (1963).
  10. L. H. Lin, C. V. LoBianco, Appl. Opt. 6, 1255 (1967).
    [CrossRef] [PubMed]
  11. N. Nishida, Appl. Opt. 9, 239 (1970).
    [CrossRef]
  12. R. J. Collier, C. B. Burckhardt, L. H. Lin, Optical Holography (Academic Press, London, 1971), Chap. 9.
  13. A. Vander Lugt, Appl. Opt. 6, 1221 (1967).
    [CrossRef]
  14. J. Bulabois, A. Caron, J. C. Vienot, Opt. Tech. 1, 191 (1969).
    [CrossRef]
  15. O. Bryngdahl, A. L. Lohmann, Appl. Opt. 9, 231 (1970).
    [CrossRef] [PubMed]

1972 (1)

1970 (3)

1969 (2)

J. Upatnieks, C. Leonard, Appl. Opt. 8, 85 (1969).
[CrossRef] [PubMed]

J. Bulabois, A. Caron, J. C. Vienot, Opt. Tech. 1, 191 (1969).
[CrossRef]

1968 (1)

C. B. Burckhardt, J. Opt. Soc. Am. 58, 1551 (1968).

1967 (2)

1965 (1)

1963 (1)

Yu.N. Denisyuk, I. R. Protas, Opt. Spectrosc. 14, 381 (1963).

Bryngdahl, O.

Bulabois, J.

J. Bulabois, A. Caron, J. C. Vienot, Opt. Tech. 1, 191 (1969).
[CrossRef]

Burckhardt, C. B.

C. B. Burckhardt, J. Opt. Soc. Am. 58, 1551 (1968).

R. J. Collier, C. B. Burckhardt, L. H. Lin, Optical Holography (Academic Press, London, 1971), Chap. 9.

Caron, A.

J. Bulabois, A. Caron, J. C. Vienot, Opt. Tech. 1, 191 (1969).
[CrossRef]

Cathey, W. T.

Collier, R. J.

R. J. Collier, C. B. Burckhardt, L. H. Lin, Optical Holography (Academic Press, London, 1971), Chap. 9.

Denisyuk, Yu.N.

Yu.N. Denisyuk, I. R. Protas, Opt. Spectrosc. 14, 381 (1963).

Goodman, J. W.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968).

Groh, G.

G. Groh, in Optical and Acoustical Holography, E. Camatini, Ed. (Plenum Press, New York, 1972), pp. 71–110.
[CrossRef]

Harper, J. S.

Leonard, C.

Lin, L. H.

L. H. Lin, C. V. LoBianco, Appl. Opt. 6, 1255 (1967).
[CrossRef] [PubMed]

R. J. Collier, C. B. Burckhardt, L. H. Lin, Optical Holography (Academic Press, London, 1971), Chap. 9.

LoBianco, C. V.

Lohmann, A. L.

Nishida, N.

N. Nishida, Appl. Opt. 9, 239 (1970).
[CrossRef]

Pennington, K. S.

Protas, I. R.

Yu.N. Denisyuk, I. R. Protas, Opt. Spectrosc. 14, 381 (1963).

Righini, G. C.

Russo, V.

Sottini, S.

Stroke, G. W.

G. W. Stroke, in Optical and Acoustical Holography, E. Camatini, Ed. (Plenum Press, New York, 1972), pp. 411–426.
[CrossRef]

Upatnieks, J.

Vander Lugt, A.

Vienot, J. C.

J. Bulabois, A. Caron, J. C. Vienot, Opt. Tech. 1, 191 (1969).
[CrossRef]

Appl. Opt. (7)

J. Opt. Soc. Am. (2)

W. T. Cathey, J. Opt. Soc. Am. 55, 457 (1965).
[CrossRef]

C. B. Burckhardt, J. Opt. Soc. Am. 58, 1551 (1968).

Opt. Spectrosc. (1)

Yu.N. Denisyuk, I. R. Protas, Opt. Spectrosc. 14, 381 (1963).

Opt. Tech. (1)

J. Bulabois, A. Caron, J. C. Vienot, Opt. Tech. 1, 191 (1969).
[CrossRef]

Other (4)

R. J. Collier, C. B. Burckhardt, L. H. Lin, Optical Holography (Academic Press, London, 1971), Chap. 9.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968).

G. Groh, in Optical and Acoustical Holography, E. Camatini, Ed. (Plenum Press, New York, 1972), pp. 71–110.
[CrossRef]

G. W. Stroke, in Optical and Acoustical Holography, E. Camatini, Ed. (Plenum Press, New York, 1972), pp. 411–426.
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Diffraction efficiency vs optical density, for bleached-plus-darkened and shrinkage-corrected volume holograms.

Fig. 2
Fig. 2

Compact processing system which utilizes reflection filters.

Fig. 3
Fig. 3

Input transparency. Character R is the signal to be recognized.

Fig. 4
Fig. 4

Correlation response of the reflection filter matched to character R and illuminated by the input pattern of Fig. 3.

Fig. 5
Fig. 5

Microphotometer sections taken from the photographic negative of the correlation plane. (a) Intensity of the correlation response of Fig. 4 (filter in its optimum position). (b) Correlations intensity for a 0.3-mm lateral displacement of the filter.

Tables (1)

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Table I Photographic Processing for Kodak 649F Plates

Equations (1)

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I = I 0 sin c 2 ( L Δ ξ / λ f ) ,

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