Imaging quality analysis of multi-channel scanning radiometer

Hong Fan; Wujun Xu; Chengliang Wang

doi:10.1117/12.791224

19 February 2008 Imaging quality analysis of multi-channel scanning radiometer

Hong Fan, Wujun Xu, Chengliang Wang

Proceedings Volume 6625, International Symposium on Photoelectronic Detection and Imaging 2007: Related Technologies and Applications; 66251M (2008) https://doi.org/10.1117/12.791224
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

Multi-channel scanning radiometer, on boarding FY-2 geostationary meteorological satellite, plays a key role in remote sensing because of its wide field of view and continuous multi-spectral images acquirements. It is significant to evaluate image quality after performance parameters of the imaging system are validated. Several methods of evaluating imaging quality are discussed. Of these methods, the most fundamental is the MTF. The MTF of photoelectric scanning remote instrument, in the scanning direction, is the multiplication of optics transfer function (OTF), detector transfer function (DTF) and electronics transfer function (ETF). For image motion compensation, moving speed of scanning mirror should be considered. The optical MTF measurement is performed in both the EAST/WEST and NORTH/SOUTH direction, whose values are used for alignment purposes and are used to determine the general health of the instrument during integration and testing. Imaging systems cannot perfectly reproduce what they see and end up "blurring" the image. Many parts of the imaging system can cause blurring. Among these are the optical elements, the sampling of the detector itself, post-processing, or the earth's atmosphere for systems that image through it. Through theory calculation and actual measurement, it is proved that DTF and ETF are the main factors of system MTF and the imaging quality can satisfy the requirement of instrument design.

Citation Download Citation

Hong Fan, Wujun Xu, and Chengliang Wang "Imaging quality analysis of multi-channel scanning radiometer", Proc. SPIE 6625, International Symposium on Photoelectronic Detection and Imaging 2007: Related Technologies and Applications, 66251M (19 February 2008); https://doi.org/10.1117/12.791224

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KEYWORDS

Modulation transfer functions

Imaging systems

Optical transfer functions

Sensors

Radiometry

Image quality

Point spread functions

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