| Autor: |
Yilmaz, Ozgur, Turk, Fethi, Selimoglu, Ozgur |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 9/6/2012, Vol. 1476 Issue 1, p365-369, 5p, 2 Black and White Photographs, 2 Charts, 1 Graph |
| Abstrakt: |
Radiometric calibration of an imaging telescope is usually made using a uniform illumination sphere in a laboratory. In this study, we used the open-sky images taken during bright day conditions to calibrate our telescope. We found a dark signal offset value and a linear response coefficient value for each pixel by using three different algorithms. Then we applied these coefficients to the taken images, and considerably lowered the image non-uniformity. Calibration can be repeated during the operation of telescope with an object that has better uniformity than open-sky. Also SNR (Signal to Noise Ratio) of each pixel was calculated from the open-sky images using the temporal mean and standard deviations. It is found that SNR is greater than 80 for all pixels even at low light levels. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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