## 4 Experiments and Analysis
### Experimental Results and Analysis
The BDSD-PC method can obtain the second best value on the SID index and the third best values on the CC and RASE indices. The PRACS method can obtain the third best value on the SID index. Thus, from the analysis of the objective evaluation results in Table 2, the proposed method has superior spatial detail retention characteristics and spectral retention characteristics, and the overall effect is better. In Figure 11, compared with the reference MS image, the BL and GFD methods appear spectral distortion with different degrees. In particular, in the local magnification region, for the BL method, the light gray part becomes dark gray. For the GFD method, the yellowish part becomes pink. Moreover, the WTSR and GFD methods have severe spatial detail distortion. The fused images obtained by the MOD, PRACS, VLGC, and BDSD-PC methods have a higher spectral resolution and retain the spectral information contained in the MS images. However, compared with these methods, the spatial details of the proposed method are more defined, especially in the local magnification region. In Figure 9, from the analysis of subjective vision, the proposed method has clearer spatial details and higher spectral resolution, which means that the proposed method improves spatial details while more spectral information contained in the MS images is retained. In Table 3, the proposed method can obtain the best values on all six quantitative indices. Besides, the VLGC method can obtain the second best values on the ERGAS and QNR indices, and the third best values on the CC, SID, and RASE indices. The MOD method can obtain the second best values on the CC, SID, and RASE indices, and the third best values on the ERGAS and QNR indices. Thus, from the analysis of the objective evaluation results in Table 3, the proposed method has superior spatial detail retention characteristics and spectral retention characteristics, and the overall effect is better. In Figure 12, compared with the reference MS image, the BL, AGS, IHST, and MPCA methods show spectral distortion with different degrees in the overall region. In particular, in the local magnification region, for the BL and IHST methods, the pink part becomes dark red and the dark green part becomes light blue. For the AGS and MPCA methods, the pink part became dark green and the dark green part became light pink. Moreover, the WTSR and GFD methods have spatial detail distortion with different degrees. The fused images obtained by the MOD, PRACS, VLGC, and BDSD-PC methods have higher spectral resolution and retained the spectral information contained in the MS images. However, compared with these methods, the spatial details of the proposed method are more defined,especially in the local magnification region. In Figure 10, from the analysis of subjective vision, the proposed method has clearer spatial details and higher spectral resolution, which means that the proposed method improves spatial details while more spectral information contained in the MS images is retained. In Table 4, the proposed method can obtain the best values on all six quantitative indices. In addition, the VLGC method can obtain the second best values on the ERGAS and CC indices, and the third best values on the SID, QNR and RASE indices. The MOD method can obtain the second best values on the QNR, SID and RASE indices, and the third best values on the ERGAS and CC indices. The BDSD-PC method can obtain the second best value on the SID index. The PRACS method can obtain the third best values on the CC and SID indices. The PRACS method can obtain the third best value on the CC index. Thus, from the objective evaluation results in Table 4, the proposed method has superior spatial detail retention characteristics and spectral retention characteristics, and the overall effect is better. From the perspective of subjective vision, the fusion results obtained from the proposed method have clearer spatial details and higher spectral resolution.