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http://dx.doi.org/10.5140/JASS.2013.30.4.321

A Modulation Transfer Function Compensation for the Geostationary Ocean Color Imager (GOCI) Based on the Wiener Filter  

Oh, Eunsong (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology)
Ahn, Ki-Beom (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology)
Cho, Seongick (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology)
Ryu, Joo-Hyung (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology)
Publication Information
Journal of Astronomy and Space Sciences / v.30, no.4, 2013 , pp. 321-326 More about this Journal
Abstract
The modulation transfer function (MTF) is a widely used indicator in assessments of remote-sensing image quality. This MTF method is also used to restore information to a standard value to compensate for image degradation caused by atmospheric or satellite jitter effects. In this study, we evaluated MTF values as an image quality indicator for the Geostationary Ocean Color Imager (GOCI). GOCI was launched in 2010 to monitor the ocean and coastal areas of the Korean peninsula. We evaluated in-orbit MTF value based on the GOCI image having a 500-m spatial resolution in the first time. The pulse method was selected to estimate a point spread function (PSF) with an optimal natural target such as a Seamangeum Seawall. Finally, image restoration was performed with a Wiener filter (WF) to calculate the PSF value required for the optimal regularization parameter. After application of the WF to the target image, MTF value is improved 35.06%, and the compensated image shows more sharpness comparing with the original image.
Keywords
modulation transfer function; MTF compensation; Wiener filter; geostationary ocean color imager (GOCI);
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Times Cited By KSCI : 3  (Citation Analysis)
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