Abstract

The so-called half-filter method for calibrating photographic plates is theoretically one of the most reliable among those published. Several numerical processes have been proposed to implement its practical realization. We have tested some of them and have found that they were not effective in certain cases. In our effort to avoid these failures we present in this paper two alternative numerical processes which have worked satisfactorily in all the cases essayed.

© 1984 Optical Society of America

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References

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  1. T. Tsubaki, O. Engvold, “An Analytical Representation for Photographic Characteristic Curves,” AAS Photo-Bull. 9, 17 (1975).
  2. K. Schwarzschild, “Aktinometrie der Sterne der BD bis zur Groesse 7.5 in der Zone 0° his + 20° Deklination,” in Abhandlungen der Koeniglichen Gesellschaftder Wissenschaften zu Göttingen, Vol. 6 (Weidmannsche Buchhandlung, Berlin, 1910). No. 6, pp. 12–17.
  3. H. Kienle, “Photographische Photometrie,” in Handbuch der Experimentalphysik, Vol. 26 (Akademische Verlargsgesellschaft, Leipzig, 1937), p. 649.
  4. I. Furenlid, “A Method for Calibration of Stellar Spectra,” AAS Photo-Bull. 1, 15 (1973).
  5. U. Grossmann-Doerth, “Interner Bericht des Fraunhofer Institutes,” Freiburg, G.F.R. (1976).
  6. U. Grossmann-Doerth, “Interner Bericht des Kiepenheuer Institutes,” Freiburg, G.F.R. (1980).
  7. J. Steiger, Diplomarbeit, U. Freiburg, G.F.R. (1977).
  8. C. de Boor, A Practical Guide to Splines (Springer, New York, 1978).
    [CrossRef]

1975 (1)

T. Tsubaki, O. Engvold, “An Analytical Representation for Photographic Characteristic Curves,” AAS Photo-Bull. 9, 17 (1975).

1973 (1)

I. Furenlid, “A Method for Calibration of Stellar Spectra,” AAS Photo-Bull. 1, 15 (1973).

de Boor, C.

C. de Boor, A Practical Guide to Splines (Springer, New York, 1978).
[CrossRef]

Engvold, O.

T. Tsubaki, O. Engvold, “An Analytical Representation for Photographic Characteristic Curves,” AAS Photo-Bull. 9, 17 (1975).

Furenlid, I.

I. Furenlid, “A Method for Calibration of Stellar Spectra,” AAS Photo-Bull. 1, 15 (1973).

Grossmann-Doerth, U.

U. Grossmann-Doerth, “Interner Bericht des Fraunhofer Institutes,” Freiburg, G.F.R. (1976).

U. Grossmann-Doerth, “Interner Bericht des Kiepenheuer Institutes,” Freiburg, G.F.R. (1980).

Kienle, H.

H. Kienle, “Photographische Photometrie,” in Handbuch der Experimentalphysik, Vol. 26 (Akademische Verlargsgesellschaft, Leipzig, 1937), p. 649.

Schwarzschild, K.

K. Schwarzschild, “Aktinometrie der Sterne der BD bis zur Groesse 7.5 in der Zone 0° his + 20° Deklination,” in Abhandlungen der Koeniglichen Gesellschaftder Wissenschaften zu Göttingen, Vol. 6 (Weidmannsche Buchhandlung, Berlin, 1910). No. 6, pp. 12–17.

Steiger, J.

J. Steiger, Diplomarbeit, U. Freiburg, G.F.R. (1977).

Tsubaki, T.

T. Tsubaki, O. Engvold, “An Analytical Representation for Photographic Characteristic Curves,” AAS Photo-Bull. 9, 17 (1975).

AAS Photo-Bull. (2)

I. Furenlid, “A Method for Calibration of Stellar Spectra,” AAS Photo-Bull. 1, 15 (1973).

T. Tsubaki, O. Engvold, “An Analytical Representation for Photographic Characteristic Curves,” AAS Photo-Bull. 9, 17 (1975).

Other (6)

K. Schwarzschild, “Aktinometrie der Sterne der BD bis zur Groesse 7.5 in der Zone 0° his + 20° Deklination,” in Abhandlungen der Koeniglichen Gesellschaftder Wissenschaften zu Göttingen, Vol. 6 (Weidmannsche Buchhandlung, Berlin, 1910). No. 6, pp. 12–17.

H. Kienle, “Photographische Photometrie,” in Handbuch der Experimentalphysik, Vol. 26 (Akademische Verlargsgesellschaft, Leipzig, 1937), p. 649.

U. Grossmann-Doerth, “Interner Bericht des Fraunhofer Institutes,” Freiburg, G.F.R. (1976).

U. Grossmann-Doerth, “Interner Bericht des Kiepenheuer Institutes,” Freiburg, G.F.R. (1980).

J. Steiger, Diplomarbeit, U. Freiburg, G.F.R. (1977).

C. de Boor, A Practical Guide to Splines (Springer, New York, 1978).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Densitometric wedge filter pattern used to calibrate the plates by the half-filter method.

Fig. 2
Fig. 2

First set of points of the characteristic curve obtained from the intermediate one.

Fig. 3
Fig. 3

Intermediate curve fitted to the experimental points by the splines method using third degree polynomials. These points have been obtained by measuring several step-wedge filter images which have been taken with similar exposures.

Fig. 4
Fig. 4

Characteristic curve corresponding to the intermediate one represented in Fig. 3. The points of the curve are represented here, joined together by straight lines, without any type of interpolation.

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