Translator Disclaimer
25 September 2012 One-shot focusing using the entropy as a merit function
Author Affiliations +
We present a method for measuring focus aberrations on wide field telescopes based on an entropy analysis of a single image. First, we calibrate the system using the evolution of the entropy as a function of the position in the field and the focuser position. This gives us a model defining the tilt of the sensor and the field curvature. Then, using a single image at a given position of the focuser in which the mean defocus is unknown, we can compute the position where the focuser must be set in order to minimize the focus aberration over the whole field.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. Suc, S. Royo, A. Jordán, G. Bakos, and K. Penev "One-shot focusing using the entropy as a merit function", Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 844914 (25 September 2012);


Focus and alignment using out of focus stellar images at...
Proceedings of SPIE (September 16 2010)
Midas Package For The Reduction Of Echelle Spectra
Proceedings of SPIE (October 12 1986)
Fake fingerprint detection based on image analysis
Proceedings of SPIE (January 25 2010)
PIONIER: a status report
Proceedings of SPIE (September 11 2012)

Back to Top