Nonlinear Electromagnetic Inverse Scattering Imaging Based on IN-LSQR

Table 2

Comparison of IN-LW and IN-LSQR methods in terms of computation time and contrast error at .

Experiment	Method	Iteration		Iteration		Iteration		Iteration
		Time (s)		Time (s)		Time (s)		Time (s)
dielTM in Figure 2(a)	IN-LW	427.950	0.971	3.725 × 10^3	0.893	9.784 × 10^3	0.823	1.098 × 10^4	0.768
	IN-LSQR	35.236	0.898	164.792	0.668	319.208	0.609	470.326	0.570
twodielTM in Figure 2(b)	IN-LW	445.85	0.962	3.824 × 10^3	0.876	9.809 × 10^3	0.801	1.177 × 10^4	0.758
	IN-LSQR	35.558	0.915	169.672	0.693	330.833	0.644	488.199	0.611