Abstract

Test objects that vary sinusoidally in transmittance have been made by photographing variable-width sinusoidal test objects with cylindrical optics and printing the negative in such a way that the over-all gamma of the negative-positive combination is approximately unity. A gray scale is included with the test-object array and serves to calibrate the various levels carried through the systems that are tested. Methods of use are described and a practical example is given.

© 1963 Optical Society of America

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References

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  1. E. W. H. Selwyn, Phot. J. 88B, 46 (1948).
  2. N. S. Kapany, J. N. Pike, J. Opt. Soc. Am. 46, 867 (1956).
    [CrossRef]
  3. N. S. Kapany, J. A. Eyer, R. R. Shannon, J. Opt. Soc. Am. 47, 103 (1957).
    [CrossRef]
  4. D. H. Kelly, M. E. Lynch, D. S. Ross, J. Opt. Soc. Am. 48, 858 (1958).
    [CrossRef]
  5. P. Lindberg, Optica Acta 1, 80 (1954).
    [CrossRef]
  6. R. L. Lamberts, J. Opt. Soc. Am. 51, 982 (1961).
    [CrossRef]
  7. R. L. Lamberts, J. Opt. Soc. Am. 49, 425 (1959).
    [CrossRef]
  8. R. Desprez, J. Pollet, Compt. rend. 251, 674 (1960).
  9. O. Schade, J. Soc. Motion Picture Television Engrs. 67, 561 (1958).

1961 (1)

1960 (1)

R. Desprez, J. Pollet, Compt. rend. 251, 674 (1960).

1959 (1)

1958 (2)

D. H. Kelly, M. E. Lynch, D. S. Ross, J. Opt. Soc. Am. 48, 858 (1958).
[CrossRef]

O. Schade, J. Soc. Motion Picture Television Engrs. 67, 561 (1958).

1957 (1)

1956 (1)

1954 (1)

P. Lindberg, Optica Acta 1, 80 (1954).
[CrossRef]

1948 (1)

E. W. H. Selwyn, Phot. J. 88B, 46 (1948).

Compt. rend. (1)

R. Desprez, J. Pollet, Compt. rend. 251, 674 (1960).

J. Opt. Soc. Am. (5)

J. Soc. Motion Picture Television Engrs. (1)

O. Schade, J. Soc. Motion Picture Television Engrs. 67, 561 (1958).

Optica Acta (1)

P. Lindberg, Optica Acta 1, 80 (1954).
[CrossRef]

Phot. J. (1)

E. W. H. Selwyn, Phot. J. 88B, 46 (1948).

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Figures (3)

Fig. 1
Fig. 1

Sinusoidal test object made as described in the text. The patterns constituting the inner rows are sinusoidal; the outer patterns are of uniform density to furnish sensitometric calibration data.

Fig. 2
Fig. 2

Scheme of test object shown in Fig. 1. The figures for the sinusoidal patterns indicate spatial frequency in cycles per millimeter; those for the gray scales indicate density above base and fog.

Fig. 3
Fig. 3

Evaluation of 50-mm Kodak Enlarging Ektar Lens working at f/8. ○—results obtained by using technique described in the text; Δ—results obtained by direct measurement with individual variable-area test objects and cylindrical lens.

Equations (7)

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D = γ log E + constant ,
T = E - γ · constant .
T p = E N γ N γ P · constant ,
Δ D = log T min - log T max = log ( T min / T max ) ,
Modulation = T max - T min T max + T min = 1 - ( T min / T max ) 1 + ( T min / T max ) .
Δ log E = log E max - log E min = log ( E max / E min )
Modulation = E max - E min E max + E min = ( E max / E min ) - 1 ( E max / E min ) + 1 .

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