Journal of Cloud Computing

Advances, Systems and Applications

Table 7 Results of rotation attacks

From: A robust encryption watermarking algorithm for medical images based on ridgelet-DCT and THM double chaos

Sense of rotation	Clockwise		Contrarotate
Rotation angles	PSNR	NC	PSNR	NC
5	16.19	1.00	16.19	1.00
10	13.49	1.00	13.49	0.91
15	12.70	0.91	12.70	0.91
20	12.38	0.77	12.38	0.83
25	12.16	0.77	12.16	0.83
30	11.90	0.77	11.90	0.83
35	11.58	0.77	11.58	0.75
40	11.25	0.77	11.25	0.67
45	10.95	0.69	10.95	0.60

Back to article page