A study of a correlation tracking method to improve imaging quality of ground-based solar telescopes

Details A study of a correlation tracking method to improve imaging quality of ground-based solar telescopes A study of a correlation tracking method to improve imaging quality of ground-based solar telescopes

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...119...85v&link_type=abstract

Astronomy and Astrophysics, vol. 119, no. 1, Mar. 1983, p. 85-94.

Astronomy and Astrophysics

Astrophysics

24

Cross Correlation, Image Motion Compensation, Optical Tracking, Solar Granulation, Solar Instruments, Telescopes, Atmospheric Effects, Fourier Transformation, Image Enhancement, Image Resolution, Scintillation, Time Series Analysis, Tracking Filters

Scientific paper

The measurement and correction of image motion introduced by the earth's atmosphere is undertaken, in order to improve solar imaging, by means of a correlation-tracking method designed to guide ground-based solar telescopes during the study of small scale, low contrast photospheric structures. A time series of digitized images was obtained with a two-dimensional CCD camera of 32 x 32 pixels. Image motion was determined from the locations of the cross-correlation function peaks of an arbitrarily chosen reference image, and the tracking method was simulated off-line by computer methods. Analysis results indicate that image motion may be suppressed to a residual rms value as low as 1/18th of the theoretical Rayleigh limit of telescopic resolution. The correlation method is found to work on arbitrary structures with rms constant values as low as a few percent under acceptable seeing conditions.

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