Table 7. Grand average PSNR (dB) of estimated denoised images under zero-mean additive Laplacian noise exploiting patch-based sparse and redundant representations.

σ	OMP	GOMP	CMP	Cauchy	Fair	Huber	Tukey	Welsch
5	36.27	36.25	35.64	36.59	36.56	36.56	36.21	36.30
10	32.22	32.19	31.03	32.44	32.20	32.38	32.15	32.15
15	30.09	30.05	28.97	30.20	29.83	30.15	29.95	29.90
20	28.63	28.58	27.88	28.70	28.33	28.66	28.50	28.45
25	27.51	27.45	27.14	27.60	27.30	27.58	27.45	27.41