Abstract

It has been found experimentally that a correlation exists between visually determined resolution limits using four-bar patterns recorded on film and the measured intensity of laser light diffracted from a grating pattern recorded on the film near the four-bar patterns. This correlation has been established for one-lens type and film combination. A practical device has been constructed that reads resolution and is suitable for a production test of a lens–film system.

© 1971 Optical Society of America

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References

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  1. F. H. Perrin, Photogr. Sci. Eng. 69, 151 (1960).
  2. T. J. Lauroesch et al., Appl. Opt. 9, 875 (1970).
    [CrossRef] [PubMed]
  3. J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968), p. 57ff.
  4. Background density is defined here as the density on the film negative produced by the image of a large white card in the original scene.

1970

1960

F. H. Perrin, Photogr. Sci. Eng. 69, 151 (1960).

Goodman, J. W.

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968), p. 57ff.

Lauroesch, T. J.

Perrin, F. H.

F. H. Perrin, Photogr. Sci. Eng. 69, 151 (1960).

Appl. Opt.

Photogr. Sci. Eng.

F. H. Perrin, Photogr. Sci. Eng. 69, 151 (1960).

Other

J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968), p. 57ff.

Background density is defined here as the density on the film negative produced by the image of a large white card in the original scene.

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Figures (8)

Fig. 1
Fig. 1

Schematic diagram of diffraction technique for resolution prediction.

Fig. 2
Fig. 2

Family of hypothetical transfer functions corresponding to lens systems of differing quality.

Fig. 3
Fig. 3

Schematic of experimental resolution measurement system.

Fig. 4
Fig. 4

Photodetector signal as a function of focus; □, ○, and × denote different exposure series.

Fig. 5
Fig. 5

Visually determined resolution as a function of focus; □, ○, and × denote different exposure series.

Fig. 6
Fig. 6

Correlation between photodetector and visually determined resolution for the two extremes in negative background density used.

Fig. 7
Fig. 7

Geometrical slope of correlation curves (as in Fig. 6) as a function of background density.

Fig. 8
Fig. 8

Segmented straight line approximation of characteristic curve of the film used in the experiment.

Tables (1)

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Table I Summary of Numerical Data

Equations (8)

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E ( x ) = E 0 ( 1 + m cos ω x ) ,
T ( x ) = T a ( 1 + m cos ω x ) γ ; D a = log 1 T a ,
t ( x ) = [ T ( x ) ] 1 2 ,
t ( x ) 1 + n = 1 α n cos n ω x .
I n = I L K α 2 n 4 ,
I n = I L T a 1 + j = 1 α 2 j 2 × α 2 n 4 .
1 + j = 1 α j 2 / 2 1
I n I L m 2 γ 2 T a ,

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