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Optics Letters

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  • Vol. 26, Iss. 23 — Dec. 1, 2001
  • pp: 1831–1833

Effective noise in thresholded intensity distribution: influence on centroid statistics

J. Ares and J. Arines  »View Author Affiliations


Optics Letters, Vol. 26, Issue 23, pp. 1831-1833 (2001)
http://dx.doi.org/10.1364/OL.26.001831


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Abstract

It is usual to preprocess data before reduction, but it is not so common to study how this operation affects the final results. Determination of the centroid is a relevant task for many optical measurement devices, and the centroid is very often calculated over thresholded data. The influence of preprocessing thresholding algorithms on the statistical properties of intensity data affected by additive Gaussian noise is described as a different effective additive signal perturbation. Theoretical, simulated, and experimental analyses of the model of the effective noise were performed, and good agreement among the analyses was obtained. Direct extension of the analyses from the influence of preprocessing to centroid determination is also presented.

© 2001 Optical Society of America

OCIS Codes
(030.4280) Coherence and statistical optics : Noise in imaging systems
(100.2960) Image processing : Image analysis
(120.4640) Instrumentation, measurement, and metrology : Optical instruments

Citation
J. Ares and J. Arines, "Effective noise in thresholded intensity distribution: influence on centroid statistics," Opt. Lett. 26, 1831-1833 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-23-1831


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References

  1. S. V. Plotnikov, “Comparison of the methods of signal processing in triangulation measurement systems,” J. Opt. Instrum. Data Proc. 6, 55–60 (1995).
  2. R. Irwan R. G. Lane, “Analysis of optimal centroid estimation applied to SH sensing,” Appl. Opt. 38, 6737–6743 (1999).
  3. G. Cao X. Yu, “Accuracy analysis of HS wavefront sensor operated with a faint object,” Opt. Eng. 33, 2331–2335 (1994).

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