In: Wagner W., Szekely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Vol. XXXVIII, Part 7B 
(b) 
| Figure 7 shows the Entropy of each band MS and fused images. 
The Entropy of Standard IHS is the highest in the five 
algorithms. The Entropy can reflect the average information 
included in the fused image, therefore, the Standard IHS-fused 
image has absorbed the high spatial frequency information most 
and thus shows crisper than the others. Entropy of PC is the 
further maximum and Entropy of Brovey is minimum, 
figure 8 shows the wavelet fusion result has the lowest of edge 
accordance whit panchromatic image in the five algorithms, that 
indicating worse spatial quality. 
% 
'(c) 
MS 
S. IHS 
Mod.lHS 
PC 
Brovey 
Wavelet 
I Band R(NIR) 
0.633 
0.855 
0.836 
0.876 
0.848 
0.665 
1 Band G(R) 
0.59 
0.859 
0.885 
0.965 
0.903 
0.65 
■ Band B(G) 
0.62 
0.816 
0.832 
0.936 
0.888 
0.642 
(d) 
Figure 5. Correlation coefficients between the high pass filtered 
panchromatic image and high pass filtered fusion results. 
(e) 
(f) 
(g) 
Figure 4. (a) original Pan image, (b) original MS image, (c) 
Standard IHS fused image, (d) modified IHS fused image, (e) 
PC fused image. (f)Wavelet fused image. (g)Brovey fused imge. 
I Band R(NIR) 
I Band G(R) 
I Band B(G) 
S. IHS 
6.257 
12.684 
11.434 
Mod.lHS 
1.924 
3.862 
3.861 
PC 
2.518 
6.667 
5.198 
Brovey 
1.222 
2.47 
2.304 
Wavelet 
1.62 
3.191 
2.952 
Figure 6. Average gradients of the fused images. 
I Band R(NIR) 
I Band G(R) 
MS 
4.861 
6.114 
S.IHS Mod.lHS 
6.732 
6.59 
4.922 
6.165 
Band B(G) 5.714 7.589 6.044 6.553 5.342 5.759 
PC 
5.528 
6.912 
Brovey Wavelet 
4.399 
5.558 
5.034 
6.14 
Figure 7. Entropy of the MS and fused images. 
207