The Nonsubsampled Contourlet Transform Based Statistical Medical Image Fusion Using Generalized Gaussian Density

Table 3

Objective evaluation results of the five metrics for MRI and SPECT images.

	Index	DWT	GP	IHS	NSST-2	NSST-3	NSCT-3	NSCT-4	Proposed
Figure 8	MI	2.167	2.028	2.255	2.399	2.688	2.376	2.520	2.695
	EN	4.424	3.973	4.105	4.870	4.507	3.533	4.499	4.531
	SF	31.89	29.57	35.06	35.28	40.17	34.79	39.78	41.20
		0.487	0.481	0.512	0.499	0.556	0.507	0.536	0.576
	UID	0.802	0.812	0.711	0.724	0.817	0.765	0.813	0.826
	Index	DWT	GP	IHS	ST	CT	NSST-4	NSCT	Proposed
Figure 9	MI	2.485	2.113	2.872	2.480	2.532	3.076	2.784	3.083
	EN	4.277	4.050	4.202	4.561	4.426	4.594	4.202	4.668
	SF	31.24	29.48	31.26	35.47	40.69	39.45	40.87	41.76
		0.518	0.506	0.502	0.537	0.536	0.538	0.519	0.540
	UID	0.793	0.679	0.714	0.783	0.799	0.806	0.801	0.817