Abstract

An adaptive periodic-correlation (APC) algorithm was developed for use in extended-scene Shack–Hartmann wavefront sensors. It provides high accuracy even when the subimages in a frame captured by a Shack–Hartmann camera are not only shifted but also distorted relative to each other. Recently we found that the shift estimate error of the APC algorithm has a component that depends on the content of the extended scene. In this paper, we assess the amount of that error and propose a method to minimize it.

© 2013 Optical Society of America

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