Bayesian approach to estimation of the map of dark current in wavelet domain

J. Švihlík; M. Řeřábek; P. Páta

doi:10.1117/12.787805

15 July 2008 Bayesian approach to estimation of the map of dark current in wavelet domain

J. Švihlík, M. Řeřábek, P. Páta

Proceedings Volume 7019, Advanced Software and Control for Astronomy II; 701932 (2008) https://doi.org/10.1117/12.787805
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

This paper deals with advanced methods for elimination of the thermally generated charge in the astronomical images, which were acquired by Charged Coupled Device (CCD) sensor. There exist a number of light images acquired by telescope, which were not corrected by dark frame. The reason is simple the dark frame doesn't exists, because it was not acquired. This situation may for instance come when sufficient memory space is not available. There will be discussed the correction method based on the modeling of the light and dark image in the wavelet domain. As the model for the dark frame image and for the light image the generalized Laplacian was chosen. The models parameters were estimated using moment method, whereas an extensive measurement on astronomical camera were proposed and done. This measurement simplifies estimation of the dark frame model parameters. Finally a set of the astronomical testing images were corrected and then the objective criteria for an image quality evaluation based on the aperture photometry were applied.

Citation Download Citation

J. Švihlík, M. Řeřábek, and P. Páta "Bayesian approach to estimation of the map of dark current in wavelet domain", Proc. SPIE 7019, Advanced Software and Control for Astronomy II, 701932 (15 July 2008); https://doi.org/10.1117/12.787805

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