FIGURE 8 Qualitative evaluation of our SSN-CAEþIE with nine state-of-the-art methods. Each row denotes an image subset, Set-1: CT&MR-T1; Set2: CT&MR-T2; Set-3: MR-T1&MR-T2; Set-4: MR-T2&MR-GAD; Set-5: MR-T2&MR-PD. Each column denotes the source images and fused image of different methods. All images had already been registered and presented. FIGURE 9 Qualitative evaluation of our SSN-CAEþIE with five state-of-the-art methods. Each row denotes an image subset, Set-6: MR-T2&PET; Set7: MR-T2&SPECT_Tc; Set-8: MR-T2&SPECT_Ti. Each column denotes the source images and fused image of different methods. All images had already been registered and presented. FIGURE 10 Quantitative evaluation of our SSN-CAEþIE with 10 state-of-the-art methods in the displayed Sets images. The scale of horizontal axis denotes the corresponding set of displayed images and the scale of vertical axis denotes the value of the metrics. 76 IEEE COMPUTATIONAL INTELLIGENCE MAGAZINE | FEBRUARY 2023