Real time phase diversity advanced image processing and wavefront sensing
2007
This paper will describe a state-of-the-art approach to real time wavefront sensing and image enhancement. It will
explore Boeing existing technology that realizes a 50 Hz frame rate (with a path to 1 KHz and higher). At this higher
rate, Phase diversity will be readily applicable to compensate for distortions of large dynamic bandwidth such as those of
the atmosphere. We will describe various challenges in aligning a two-camera phase diversity system. Such
configurations make it almost impossible to process the captured images without additional upgrade in the algorithm to
account for alignment errors. An example of an error is the relative misalignment of the two images, the "best-focus"
and the diversity image where it is extremely hard to maintain alignment to less than a fraction of one pixel. We will
show that the algorithm performance increases dramatically when we account for these errors in the phase diversity
estimation process. Preliminary evaluation has assessed a NIIRS increase of ~ 3 from the "best-focus" to the enhanced
image. Such a performance improvement would greatly increase the operating range (or, equivalently, decrease the
weight) of many optical systems.
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