A Modulation Transfer Function Compensation for the Geostationary Ocean Color Imager (GOCI) Based on the Wiener Filter
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 evaluat...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2013-12-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n4/OJOOBS_2013_v30n4_321.pdf |
| Summary: | 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. |
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| ISSN: | 2093-5587 2093-1409 |