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Extended object wavefront sensing based on the correlation spectrum phase

Knutsson, Per LU ; Owner-Petersen, Mette LU and Dainty, C (2005) In Optics Express 13(23). p.9527-9536
Abstract
In this paper we investigate the performance of a Fourier based algorithm for fast subpixel shift determination of two mutually shifted images subjected to noise. The algorithm will be used for Shack-Hartmann based adaptive optics correction of images of an extended object subjected to dynamical atmospheric fluctuations. The performance of the algorithm is investigated both analytically and by Monte Carlo simulations. Good agreement is achieved in relation to how the precision of the shift estimate depends on image parameters such as contrast, photon counts and readout noise, as well as the dependence on sampling format, zero-padding and field of view. Compared to the conventional method for extended object wavefront sensing, a reduction... (More)
In this paper we investigate the performance of a Fourier based algorithm for fast subpixel shift determination of two mutually shifted images subjected to noise. The algorithm will be used for Shack-Hartmann based adaptive optics correction of images of an extended object subjected to dynamical atmospheric fluctuations. The performance of the algorithm is investigated both analytically and by Monte Carlo simulations. Good agreement is achieved in relation to how the precision of the shift estimate depends on image parameters such as contrast, photon counts and readout noise, as well as the dependence on sampling format, zero-padding and field of view. Compared to the conventional method for extended object wavefront sensing, a reduction of the computational cost is gained at a marginal expense of precision. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
13
issue
23
pages
9527 - 9536
publisher
OSA
external identifiers
  • wos:000233334900044
  • scopus:27744522247
ISSN
1094-4087
language
English
LU publication?
yes
id
d5c75b47-e23d-47a7-86e4-a26739e046a2 (old id 212888)
date added to LUP
2007-08-10 13:57:03
date last changed
2017-01-01 06:51:58
@article{d5c75b47-e23d-47a7-86e4-a26739e046a2,
  abstract     = {In this paper we investigate the performance of a Fourier based algorithm for fast subpixel shift determination of two mutually shifted images subjected to noise. The algorithm will be used for Shack-Hartmann based adaptive optics correction of images of an extended object subjected to dynamical atmospheric fluctuations. The performance of the algorithm is investigated both analytically and by Monte Carlo simulations. Good agreement is achieved in relation to how the precision of the shift estimate depends on image parameters such as contrast, photon counts and readout noise, as well as the dependence on sampling format, zero-padding and field of view. Compared to the conventional method for extended object wavefront sensing, a reduction of the computational cost is gained at a marginal expense of precision.},
  author       = {Knutsson, Per and Owner-Petersen, Mette and Dainty, C},
  issn         = {1094-4087},
  language     = {eng},
  number       = {23},
  pages        = {9527--9536},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Extended object wavefront sensing based on the correlation spectrum phase},
  volume       = {13},
  year         = {2005},
}