Improved Chaos-Based Cryptosystem for Medical Image Encryption and Decryption

Table 9

PSNR, SSIM, and NC results between the original and the corresponding decrypted image under different variance of Gaussian white noise.

Image	Noise	Gaussian white
	Variance	0.005	0.009	0.01	0.05	0.09	0.1	0.5
Lena; 512 × 512 × 3	PSNR	38.90	37.81	35.61	33.19	29.11	28.23	23.61
	SSIM	0.906	0.837	0.824	0.725	0.658	0.548	0.409
	NC	0.947	0.893	0.781	0.719	0.695	0.663	0.465
Peppers; 512 × 512 × 3	PSNR	38.75	12.72	12.54	10.21	9.56	9.45	8.17
	SSIM	0.932	0.882	0.832	0.754	0.622	0.541	0.415
	NC	0.954	0.889	0.847	0.783	0.637	0.515	0.457
Baboon; 512 × 512 × 3	PSNR	39.19	38.15	36.07	33.83	29.75	28.54	23.77
	SSIM	0.922	0.876	0.763	0.604	0.571	0.530	0.405
	NC	0.983	0.891	0.800	0.751	0.540	0.508	0.443
3D ultrasound baby; 2844 × 4044 × 3	PSNR	39.43	38.53	36.10	33.71	29.02	28.90	23.82
	SSIM	0.971	0.877	0.849	0.732	0.650	0.635	0.412
	NC	0.982	0.925	0.872	0.747	0.636	0.622	0.397
3D scanner ankle; 1080 × 1920 x 3	PSNR	39.72	38.13	37.81	32.76	29.15	27.42	23.85
	SSIM	0.981	0.893	0.867	0.759	0.673	0.648	0.415
	NC	0.996	0.953	0.891	0.756	0.647	0.631	0.421
3D chest radiography; 2400 × 2956 × 3	PSNR	39.86	38.57	36.22	33.72	29.33	28.94	24.03
	SSIM	0.981	0.895	0.862	0.743	0.659	0.643	0.425
	NC	0.993	0.936	0.895	0.786	0.671	0.655	0.443
3D X-ray; 3816 × 2832 × 3	PSNR	39.59	38.42	36.86	33.61	29.22	28.47	23.69
	SSIM	0.982	0.879	0.850	0.737	0.656	0.641	0.419
	NC	0.989	0.981	0.864	0.791	0.677	0.669	0.453
3D CT-scan; 800 × 600 × 3	PSNR	38.78	38.05	35.91	33.11	29.23	28.15	23.39
	SSIM	0.975	0.853	0.824	0.718	0.629	0.631	0.402
	NC	0.982	0.968	0.837	0.745	0.653	0.646	0.420
1D ultrasound; 1200 × 700	PSNR	39.14	38.42	35.98	33.47	28.87	27.97	23.52
	SSIM	0.972	0.846	0.815	0.698	0.609	0.522	0.389
	NC	0.980	0.959	0.828	0.719	0.627	0.569	0.390
MRI; 456 × 456 × 1	PSNR	38.72	37.85	35.21	32.71	28.18	27.46	23.31
	SSIM	0.973	0.851	0.809	0.692	0.589	0.519	0.382
	NC	0.986	0.965	0.829	0.714	0.631	0.573	0.387
Endoscopy; 634 × 549	PSNR	38.68	37.87	35.25	32.68	28.12	27.37	23.22
	SSIM	0.975	0.846	0.811	0.697	0.585	0.5116	0.379
	NC	0.984	0.960	0.826	0.705	0.629	0.569	0.386