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Title: Radiometric calibration and SNR calculation of a SWIR imaging telescope

Abstract

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.

Authors:
; ;  [1]
  1. Tubitak Uzay (Space Technologies Research Institute) ODTU Campus 06531 Ankara (Turkey)
Publication Date:
OSTI Identifier:
22069207
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1476; Journal Issue: 1; Conference: 2. international advances in applied physics and materials science congress, Antalya (Turkey), 26-29 Apr 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALGORITHMS; CALIBRATION; ILLUMINANCE; IMAGE PROCESSING; IMAGES; OPERATION; RADIOMETERS; SIGNALS; SIGNAL-TO-NOISE RATIO; TELESCOPES; VISIBLE RADIATION

Citation Formats

Yilmaz, Ozgur, Turk, Fethi, and Selimoglu, Ozgur. Radiometric calibration and SNR calculation of a SWIR imaging telescope. United States: N. p., 2012. Web. doi:10.1063/1.4751629.
Yilmaz, Ozgur, Turk, Fethi, & Selimoglu, Ozgur. Radiometric calibration and SNR calculation of a SWIR imaging telescope. United States. https://doi.org/10.1063/1.4751629
Yilmaz, Ozgur, Turk, Fethi, and Selimoglu, Ozgur. 2012. "Radiometric calibration and SNR calculation of a SWIR imaging telescope". United States. https://doi.org/10.1063/1.4751629.
@article{osti_22069207,
title = {Radiometric calibration and SNR calculation of a SWIR imaging telescope},
author = {Yilmaz, Ozgur and Turk, Fethi and Selimoglu, Ozgur},
abstractNote = {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.},
doi = {10.1063/1.4751629},
url = {https://www.osti.gov/biblio/22069207}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1476,
place = {United States},
year = {Thu Sep 06 00:00:00 EDT 2012},
month = {Thu Sep 06 00:00:00 EDT 2012}
}