Image Denoising Algorithm Combined with SGK Dictionary Learning and Principal Component Analysis Noise Estimation

Table 2

Denoising indicators on SGK combined with five noise estimation algorithms.

	Algorithms				Time/s	PSNR/dB	MSE
σ = 2	PCA + SGK	2.733	+0.733	0.733	1.799	43.385	2.983
	Kurtosis + SGK	2.841	+0.841	0.841	4.699	43.378	2.987
	Mode + SGK	2.768	+0.768	0.768	0.070	43.222	3.010
	Med + SGK	4.063	+2.063	2.063	0.051	41.811	4.286
	Min + SGK	0.496	−1.504	1.504	0.037	42.119	3.993
= 5	PCA + SGK	5.510	+0.510	0.510	1.829	38.383	9.436
	Kurtosis + SGK	5.166	+0.166	0.166	5.865	38.302	9.614
	Mode + SGK	4.480	−0.520	0.520	0.091	38.139	9.981
	Med + SGK	6.194	+1.194	1.194	0.047	38.251	9.727
	Min + SGK	0.674	−4.326	4.326	0.035	34.175	24.865
= 10	PCA + SGK	10.342	+0.342	0.342	1.604	35.177	19.201
	Kurtosis + SGK	9.576	+0.424	0.424	4.848	34.795	21.559
	Mode + SGK	8.809	+1.191	1.191	0.090	34.074	25.447
	Med + SGK	10.463	+0.463	0.463	0.051	35.149	19.869
	Min + SGK	1.640	−18.360	18.360	0.037	28.244	97.417
= 15	PCA + SGK	15.153	+0.147	0.147	1.995	34.269	30.632
	Kurtosis + SGK	14.196	+0.804	0.804	5.208	33.899	30.760
	Mode + SGK	12.494	+2.506	2.506	0.084	31.381	47.311
	Med + SGK	14.838	−0.162	0.162	0.082	33.221	30.971
	Min + SGK	1.807	−13.193	13.193	0.029	28.274	96.766
= 20	PCA + SGK	20.071	+0.071	0.071	1.618	31.911	41.876
	Kurtosis + SGK	18.943	−1.057	1.057	4.818	31.574	45.256
	Mode + SGK	17.038	−2.963	2.963	0.094	30.186	62.300
	Med + SGK	19.319	−0.681	0.681	0.055	31.777	43.193
	Min + SGK	1.877	−18.123	18.123	0.028	22.152	396.153
= 30	PCA+SGK	29.672	−0.328	0.328	1.393	29.917	66.286
	Kurtosis + SGK	28.480	−1.520	1.520	5.126	29.724	69.292
	Mode + SGK	23.356	−6.644	6.644	0.084	29.044	161.709
	Med + SGK	28.199	−1.801	1.801	0.054	29.614	71.074
	Min + SGK	3.292	−26.708	26.708	0.029	18.675	882.180
= 40	PCA + SGK	39.546	−0.454	0.454	1.865	28.371	94.630
	Kurtosis + SGK	38.238	−1.762	1.762	5.134	28.305	96.062
	Mode + SGK	33.463	−6.537	6.537	0.087	25.813	170.526
	Med + SGK	37.068	−2.932	2.932	0.053	27.910	105.212
	Min + SGK	5.385	−34.615	34.615	0.034	16.222	1152.049