Parallel Encryption of Noisy Images Based on Sequence Generator and Chaotic Measurement Matrix

Table 6

Structural similarity between original image and cipher image.

SSIM (cipher image)		Compression ratio
		0.3	0.4	0.5	0.6	0.7	0.8	0.9
Impulse noise	I = 0.02	0.0042	0.0044	0.0064	0.0085	0.0071	0.0067	0.0074
	I = 0.05	0.0024	0.0018	0.0049	0.0036	0.0041	0.0047	0.0052
	I = 0.1	0.0020	0.0026	0.0020	0.0035	0.0074	0.0066	0.0076
Gaussian noise	M = 0, V = 0.01	0.0.017	0.0024	0.0031	0.0054	0.0053	0.0113	0.0104
	M = 0, V = 0.02	0.0022	0.0020	0.0041	0.0031	0.0051	0.0063	0.0120
	M = 0.2, V = 0.01	0.0023	0.0022	0.0039	0.0068	0.0089	0.0112	0.0063