Table 1.

The quantitative comparisons presented in Fig. 3.

Metric	Method	Fig. 3(a)	Fig. 3(b)	Fig. 3(c)	Fig. 3(d)	Fig. 3(e)
ABE	Tikhonov	$4.35\times {10}^{-4}$	$8.52\times {10}^{-4}$	$8.70\times {10}^{-4}$	$1.69\times {10}^{-3}$	$2.50\times {10}^{-3}$
	BPNN	$8.51\times {10}^{-5}$	$1.00\times {10}^{-4}$	$1.77\times {10}^{-4}$	$4.38\times {10}^{-4}$	$8.60\times {10}^{-4}$
MSE	Tikhonov	$3.75\times {10}^{-7}$	$1.62\times {10}^{-6}$	$3.35\times {10}^{-6}$	$2.06\times {10}^{-5}$	$6.19\times {10}^{-5}$
	BPNN	$1.45\times {10}^{-7}$	$2.30\times {10}^{-7}$	$9.78\times {10}^{-7}$	$5.63\times {10}^{-6}$	$1.90\times {10}^{-5}$
PSNR (dB)	Tikhonov	27.37	23.43	26.10	24.44	21.58
	BPNN	31.75	32.40	29.64	26.47	25.28
SSIM	Tikhonov	0.17	0.20	0.45	0.75	0.84
	BPNN	0.89	0.97	0.96	0.96	0.96