An Alternating Direction Method for Mixed Gaussian Plus Impulse Noise Removal

Table 2

The PSNR (dB) and computing time (seconds) for the restoration results by MNID-ADMM, Cai-TP, and HADMM for blurred Lena contaminated by Gaussian noise (𝜎=5) plus impulse noise. The blurring kernel is the out-of-focus kernel of radius 3.

Type	Level	MNID-ADMM		Cai-TP		HADMM
		PSNR	Time	PSNR	Time	PSNR	Time
Gaussian + salt and pepper	30%	27.7	9.3	27.2	22.1	27.5	3.3
	50%	27.4	9.8	26.9	21.5	27.2	4.1
	70%	26.9	10.4	26.4	21.0	26.6	5.4
	90%	25.5	12.4	24.9	27.7	25.2	12.5
Gaussian + random valued	25%	27.8	8.7	27.0	198.6	27.6	3.3
	40%	27.6	9.6	26.7	195.3	27.4	3.6
	55%	27.3	9.7	25.7	204.3	27.0	4.1
	70%	26.9	9.8	23.0	227.7	26.6	5.4