Adaptive cross-correlation algorithm and experiment of extended scene Shack-Hartmann wavefront sensing

Erkin Sidick; Rhonda M. Morgan; Joseph J. Green; Catherine M. Ohara; David C. Redding

doi:10.1117/12.735030

20 September 2007 Adaptive cross-correlation algorithm and experiment of extended scene Shack-Hartmann wavefront sensing

Erkin Sidick, Rhonda M. Morgan, Joseph J. Green, Catherine M. Ohara, David C. Redding

Author Affiliations +

Proceedings Volume 6687, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III; 668710 (2007) https://doi.org/10.1117/12.735030
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

Citation Download Citation

Erkin Sidick, Rhonda M. Morgan, Joseph J. Green, Catherine M. Ohara, and 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); https://doi.org/10.1117/12.735030

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