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

Table 7

Experimental results under rotation distortion attack.

	Distortion quantity (%)	10	30	50	70	90
Medical image A	PSNR (dB)	13.8738	13.2751	12.8138	12.5202	12.2938
	NC	1.0	1.0	1.0	1.0	0.94054
Medical image B	PSNR (dB)	21.5541	16.336	14.1869	12.7102	11.5936
	NC	0.93883	0.81049	0.87509	0.62698	0.62927
Medical image C	PSNR (dB)	23.2593	16.2611	14.4212	13.6166	13.1196
	NC	0.93626	0.93626	0.93626	0.93626	0.5621
Medical image D	PSNR (dB)	23.6471	17.9937	16.1955	15.1909	14.7219
	NC	0.94054	0.94054	0.90682	0.90682	0.90682
Medical image E	PSNR (dB)	32.9927	27.8346	25.4521	23.7641	22.4491
	NC	0.9394	0.9394	0.87823	0.87823	0.8182