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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 72, Iss. 6 — Jun. 1, 1982
  • pp: 775–779

Transfer-function approach to random microdensitometer positioning errors

Peter G. Engeldrum  »View Author Affiliations

JOSA, Vol. 72, Issue 6, pp. 775-779 (1982)

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An analysis is conducted to determine the effect of random microdensitometer positioning errors on the computed Fourier transform (FT) of measured data. Three statistical measures of the FT are derived: the first two moments and the mean-square error (MSE). Results show that the expected FT is multiplied by the conjugate of the characteristic function of the position errors, whereas the variance and the MSE are multiplied by linear combinations of the same function. Working relationships are developed for both the continuous and discrete cases. The continuous errors were Gaussian and uniformly distributed. A simple model of a counter was used to develop expressions for the discrete case. These simple equations relate the error probability density function, or counter parameters to the relative root-mean-square error of the measured FT. An example drawn from reflection micro-densitometry suggests that continuous position error tolerances should be about the order of 0.5 µm, with counter failure probabilities less than 9 × 10-9, for a 10% relative rms error in the FT.

© 1982 Optical Society of America

Peter G. Engeldrum, "Transfer-function approach to random microdensitometer positioning errors," J. Opt. Soc. Am. 72, 775-779 (1982)

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  1. E. S. Blackman, "Effects of noise on the determination of photographic system modulation transfer function," Photog. Sci. Eng. 12, 244–250 (1968).
  2. D. Dutton, "Noise and other artifacts of OTF derived from image scanning," Appl. Opt. 14, 513–521 (1975).
  3. M. Takeda and T. Ose, "Influence of noise on the measurement of optical transfer functions by the digital Fourier transform method," J. Opt. Soc. Am. 65, 502 (1975).
  4. S. S. Wilks, Mathematical Statistics (Wiley, New York, 1962).

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