Zero-Watermarking Algorithm for Medical Image Based on VGG19 Deep Convolution Neural Network

Table 5

Experimental results under spherical distortion attack.

	Distortion quantity (%)	10	30	50	70	90
Medical image A	PSNR (dB)	12.8585	11.4917	11.1459	11.3035	11.3435
	NC	1.0	1.0	0.87166	0.87166	0.87166
Medical image B	PSNR (dB)	18.4985	14.4427	13.0098	11.7524	10.5874
	NC	0.93654	0.87366	0.81221	0.81221	0.74704
Medical image C	PSNR (dB)	27.259	19.872	16.6028	14.5081	13.0453
	NC	0.93512	1.0	1.0	1.0	0.93997
Medical image D	PSNR (dB)	23.9151	17.1131	14.5852	13.2542	12.4597
	NC	1	1	1	1	0.93769
Medical image E	PSNR (dB)	30.64	25.4487	22.91	20.9156	19.2908
	NC	0.9394	1	1	0.81763	0.62984