An optimal sharped GOCI Imager for coastal water with MTF compensation

Abstract

The Geostationary Ocean Color Imager (GOCI) is the firstoptical sensor in the geostationary orbit for monitoring theocean environment around Korean peninsula. This paperdeals with on-orbit MTF estimation with the pulse sourcemethod and its compensation results for GOCI. Also, asanalyzing the relationship between MTF compensation effectand the secondary ocean product accuracy, we confirmedthe optimal MTF compensating parameter for enhancing theimage quality without variation of ocean product accuracy. Inthis study, MTF assessment was performed using a naturaltarget because of GOCI system characteristics having the500-m spatial resolution. For the MTF compensation by theWiener Filter, we fitted a point spread function (PSF) withthe Gaussian curve controlled by a standard deviation value(σ). After the parametric analysis of finding the optimaldegradation model, σ value is determined 0.4 as an optimalindicator. Finally, MTF value is enhanced from 0.1645 to0.2152 without degradation of ocean color product accuracy.and its compensation results for GOCI. Also, asanalyzing the relationship between MTF compensation effectand the secondary ocean product accuracy, we confirmedthe optimal MTF compensating parameter for enhancing theimage quality without variation of ocean product accuracy. Inthis study, MTF assessment was performed using a naturaltarget because of GOCI system characteristics having the500-m spatial resolution. For the MTF compensation by theWiener Filter, we fitted a point spread function (PSF) withthe Gaussian curve controlled by a standard deviation value(σ). After the parametric analysis of finding the optimaldegradation model, σ value is determined 0.4 as an optimalindicator. Finally, MTF value is enhanced from 0.1645 to0.2152 without degradation of ocean color product accuracy.