20 September 2007 Adaptive cross-correlation algorithm and experiment of extended scene Shack-Hartmann wavefront sensing
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Abstract
We have developed a new, adaptive cross-correlation (ACC) algorithm to estimate with high accuracy the shift as large as several pixels in two extended-scene images captured by a Shack-Hartmann wavefront sensor (SH-WFS). It determines the positions of all extended-scene image cells relative to a reference cell using an FFT-based iterative image-shifting algorithm. It works with both point-source spot images as well as extended scene images. We have also set up a testbed for extended-scene SH-WFS, and tested the ACC algorithm with the measured data of both point-source and extended-scene images. In this paper we describe our algorithm and present our experimental results.
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Erkin Sidick, Erkin Sidick, Rhonda M. Morgan, Rhonda M. Morgan, Joseph J. Green, Joseph J. Green, Catherine M. Ohara, Catherine M. Ohara, David C. Redding, David C. Redding, } "Adaptive cross-correlation algorithm and experiment of extended scene Shack-Hartmann wavefront sensing", Proc. SPIE 6687, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III, 668710 (20 September 2007); doi: 10.1117/12.735030; https://doi.org/10.1117/12.735030
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