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
	Q AB/F	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
	Q AB/F	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