Q2n Index 0 MARCH 2021 0.3 (c) 0.25 0.2 0.15 0.1 0.05 (e) IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE 1 0.5 0.5 0 0 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN SAM 2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN 1 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN 2.5 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN D_λ ERGAS 1.5 QNR PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN D_S 3 3.5 3 2.5 1.5 2 (a) (b) (d) (f) FIGURE 6. The experiment results based on the Ikonos data set. (a)-(c) The results with the ERGAS, SAM, and Q2 n index, respectively, in the reduced-resolution experiment. (d)-(f) The results with Dm , Ds , and the QNR, respectively, in the full-resolution experiment. SFIM: smoothing filter-based intensity modulation. 29