Table 4.

Average and variance of peak signal-to-noise ratio (PSNR) (unit: db) and mean structural similarity (MSSIM) of ten test images corrupted by Cirrus system noise. The MSSIM is between 0 and 1 with a score of 1 being given only if the denoised image is exactly equivalent to the original image

Method		Noisy image	Bilateral filtering	PM model	RPPM model	TV model	ATV model
PSNR	Average	30.43	33.73	33.54	33.67	33.72	33.93
	Variance	0.13	0.34	0.82	0.87	0.83	0.61
MSSIM	Average	0.73	0.86	0.83	0.84	0.84	0.85
	Variance (×10−4)	4.3	8.7	26.7	23.4	10.8	7.0
Method		Complex diffusion	NL-means	HS method	BM3D	Proposed method
PSNR	Average	33.90	33.95	33.70	34.27	33.72
	Variance	0.70	0.79	0.63	1.29	1.32
MSSIM	average	0.85	0.84	0.84	0.84	0.83
	Variance (×10−4)	10.7	22.8	22.4	29.7	31.0