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Centroid Detection by Gaussian Pattern Matching In Adaptive Optics

by Akondi Vyas, B R Prasad, M B Roopashree
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International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Volume 1 - Number 26
Year of Publication: 2010
Authors: Akondi Vyas, B R Prasad, M B Roopashree
10.5120/483-793

Akondi Vyas, B R Prasad, M B Roopashree . Centroid Detection by Gaussian Pattern Matching In Adaptive Optics. International Journal of Computer Applications. 1, 26 ( February 2010), 30-35. DOI=10.5120/483-793

@article{ 10.5120/483-793,
author = { Akondi Vyas, B R Prasad, M B Roopashree },
title = { Centroid Detection by Gaussian Pattern Matching In Adaptive Optics },
journal = { International Journal of Computer Applications },
issue_date = { February 2010 },
volume = { 1 },
number = { 26 },
month = { February },
year = { 2010 },
issn = { 0975-8887 },
pages = { 30-35 },
numpages = {9},
url = { https://ijcaonline.org/archives/volume1/number26/483-793/ },
doi = { 10.5120/483-793 },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Journal Article
%1 2024-02-06T19:48:48.407567+05:30
%A Akondi Vyas
%A B R Prasad
%A M B Roopashree
%T Centroid Detection by Gaussian Pattern Matching In Adaptive Optics
%J International Journal of Computer Applications
%@ 0975-8887
%V 1
%N 26
%P 30-35
%D 2010
%I Foundation of Computer Science (FCS), NY, USA
Abstract

Shack Hartmann wavefront sensor is a two dimensional array of lenslets which is used to detect the incoming phase distorted wavefront through local tilt measurements made by recording the spot pattern near the focal plane. Wavefront reconstruction is performed in two stages - (a) image centroiding to calculate local slopes, (b) formation of the wavefront shape from local slope measurement. Centroiding accuracy contributes to most of the wavefront reconstruction error in Shack Hartmann sensor based adaptive optics system with readout and background noise. It becomes even more difficult in atmospheric adaptive optics case, where scintillation effects may also occur. In this paper we used a denoising technique based on thresholded Zernike reconstructor to minimize the effects due to readout and background noise. At low signal to noise ratio, this denoising technique can be improved further by taking the advantage of the shape of the spot. Assuming a Gaussian pattern for individual spots, it is shown that the centroiding accuracy can be improved in the presence of strong scintillations and background.

References
  1. J. W. Hardy, Adaptive Optics for Astronomical Telescopes, Oxford University Press, New York, (1998).
  2. David R. Williams and Jason Porter, in Adaptive Optics for Vision Science: Principles, Practices, Design, and Applications, (ed: J. Porter, et al.) (John Wiley & Sons, New Jersey, In Press) 3, 1 (2006).
  3. T. Weyrauch and M. A. Vorontsov, in Free-Space Laser Communications Principles and Advances Series: Optical and Fiber Communications Reports, (ed: A. K. Majumdar and J. C. Ricklin) (Springer) Vol. 2, 247 (2008).
  4. R. K. Tyson, Principles of Adaptive Optics. Academic Press, New York, 1998.
  5. McGuire, P. C., Sandler, D. G., Hart, M. L., Rhoadarmer, T. A., Adaptive Optics: Neural Network Wavefront Sensing, Reconstruction, and Prediction, Scienti?c Applications of Neural Nets, Proceedings of the 194th W. E. Heracus Seminar, 1998. Clark, J. W., Lindenau, T., Ristig, M. L., Springer-Verlag Publishers, pp. 97, (1999).
  6. A. Vyas, M. B. Roopashree, B. R. Prasad, in Proceedings of the National Conference on Innovative Computational Intelligence & Security Systems, Sona College of Technology, Salem. Apr 3-4, 2009. pp 400-405.
  7. S. Thomas, T. Fusco, A. Tokovinin,M. Nicolle, V. Michau, and G. Rousset, "Comparison of centroid computation algorithms in a Shack-Hartmann sensor," Monthly Notices of the Royal Astronomical Society 371, 323-336 (2006).
  8. K. L. Baker and M. M. Moallem, "Iteratively weighted centroiding for Shack- Hartmann wave-front sensors," Opt. Express 15, 5147-5159 (2007).
  9. L. A. Poyneer, D. W. Palmer, K. N. LaFortune, and B. Bauman, "Experimental results for correlation-based wave-front sensing," SPIE 5894, 58940N (2005).
  10. A. Vyas, M. B. Roopashree, B. R. Prasad, "Performance of centroiding algorithms at low light level conditions in adaptive optics" to appear in the Proceedings of the International Conference on Advances in Recent Technologies in Communication and Computing, 2009.
  11. W.H. Southwell, "Wave-front estimation from wave-front slope measurements," J. Opt. Soc. Am. 70, 998 (1980).
  12. Walter J. Wild, Edward J. Kibblewhite, and Rodolphe Vuilleumier, "Sparse matrix wave-front estimators for adaptive-optics systems for large ground-based telescopes," Opt. Lett. 20, 955-957 (1995).
  13. B. C. Platt and R. Shack, "History and principles of shack-hartmann wavefront sensing." Journal of refractive surgery (Thorofare, N.J. : 1995), 17, 5, 2001.
  14. Lawton H. Lee, Gary J. Baker, and Robert S. Benson, "Correctability limitations imposed by plane-wave scintillation in multiconjugate adaptive optics," J. Opt. Soc. Am. A 23, 2602-2612 (2006).
  15. V. V. Voitsekhovich, L. J. Sanchez, and V. G. Orlov, "Effect of scintillation on adaptive optic systems " Revista Mexicana de Astronomia y Astrofisica, 38, 193-198 (2002).
  16. A. Vyas, M. B. Roopashree, B. R. Prasad, in Proceedings of the International Conference on Advanced Computing, (ed: Gopinath Ganapathy) (Mac Millan) 303, (2009). arXiv:0909.0701v1
  17. A. Vyas, M. B. Roopashree, B. R. Prasad, in Proceedings of the International Conference on Advanced Computing, (ed: Gopinath Ganapathy) (Mac Millan) 208, (2009). arXiv:0909.0711v1
  18. K. M. Hosny, "Fast computation of accurate Zernike moments," Journal of Real-Time Image Processing 3, 97, 2008.
Index Terms

Computer Science
Information Sciences

Keywords

Adaptive Optics Shack Hartmann Sensor Wavefront Reconstruction Centroiding

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