JUNE 2022 IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE 303 PAN Image Feature LRMS Image PAN Image Feature Generator PAN Image HRMS Image Generator HRMS Image HRMS Image PAN Image HRMS Image Discriminator (a) HRMS Sample Gray Scale LRMSPAN Generator HRMS Discriminator Discriminator (d) (e) (f) FIGURE 9. The (a) PSGAN [54], (b) HPGAN [55], (c) Pan-GAN [56], (d) PanColorization GAN (PanColorGAN) [57], (e) perceptual pan-sharpening (PercepPan) [58], and (f) residual encoder-decoder conditional GAN (RED-CGAN) [59]. HRMS Image Generator Reconstructor PAN Image PAN Image LRMS Image Discriminator HRMS Image HRMS Image PAN Image PAN Image Discriminator (b) LRMS Image PAN Image Generator Feature Feature LRMS Image (c) SRF Spatial Discriminator Generator Spectral Discriminator LRMS Image LRMS Image