A New Robust Adaptive Fusion Method for Double-Modality Medical Image PET/CT

Table 2

Objective evaluation index values of different match measures for image fusion.

Methods; ()	SD	AG	SF	PSNR	MI	IE
Histogram distance	52.3534	6.7850	17.0333	59.5880	4.7553	6.0011	0.5044
Gradient ratio	52.3496	6.7836	17.0158	59.4785	4.7404	6.0041	0.5041
Energy ratio	52.3507	6.7781	17.0177	59.4676	4.7356	6.0040	0.5042
Signal strength ratio	52.3500	6.7829	17.0092	59.5400	4.7355	6.0139	0.5047
Structural similarity	52.3435	6.7721	17.0290	59.5362	4.7543	6.0083	0.5043