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19 July 1999 Use of image quality metrics for correction of noncommon path errors in the ELECTRA adaptive optics system
Nathan P. Doble, Gordon D. Love, David F. Buscher, Richard M. Myers, Alan Purvis
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Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.355014
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States
Abstract
The technique of image sharpening was first proposed by Muller and Buffington'in 1974. This work was furthered by O'Meara2 and more recently by Brigantic3. The technique is very simple and lends itself to the correction of slowly varying or static aberrations. The basic methodology is as follows;
    1) Measure the system PSF or the aberrated image.
    2) Characterise the image by means of an image metric. This metric will give one figure, which describes the 'quality' of the image.
    3) Apply a trial correction to the wavefront corrector.
    4) Reassess the image quality metric.
    5) If the metric increases apply more of the same correction, if not stop and move on. Repeat until best image is achieved.
A problem lies in how do we define the 'quality' of an image through the use of a metric. There are two general requirements:
    .
An image metric takes on the maximum value when the system is aberration free.
• The image metric needs to be calculated in a time period that is shorter than any temporal evolution of the aberration.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Nathan P. Doble, Gordon D. Love, David F. Buscher, Richard M. Myers, and Alan Purvis "Use of image quality metrics for correction of noncommon path errors in the ELECTRA adaptive optics system", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.355014
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KEYWORDS
Image quality
Adaptive optics
CCD cameras
Image processing algorithms and systems
Phase measurement
Point spread functions
Roads
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