Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..975z&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
Solar Disk: Imaging
Scientific paper
The paper presents techniques developed for an automated image standardisation including limb fitting, removal of geometrical distortion, size standardisation and intensity normalisation. The limb fitting starts with an initial estimate of the solar centre using raw 12-bit image data and then applies a Canny edge-detection routine. Candidate edge points for the limb are selected using a voting method and the chosen points fitted to a quadratic function by minimising the algebraic distance using SVD. The corrected images are generated using nearest neighbour, bilinear or bicubic interpolation. Because of a limb darkening and variation in the atmosphere visibility over the solar disc the image intensity renormalisation is also required. This is achieved by fitting a background function in polar coordinates to a set of sample points having the median intensities and by standardising the average brightness. The research is done for the European Grid of Solar Observations (EGSO) project.
Abourdarham J.
Benkhalil Ali K.
Ipson Stanley S.
Zharkov Sergey I.
Zharkova Valentin
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