Multiscale Hybrid Nonlocal Means Filtering Using Modified Similarity Measure

Table 1

PSNR comparison of the proposed and various state-of-the-art algorithms for gray-scale images.

Image		BM3D [25]	NL-Bayes [35]	GSM [18]	NLM [19]	KSVD [23]	BNLM [22]	MHNLM
Lena	10	35.93	35.88	35.61	34.35	35.47	35.25	35.40
	15	34.27	34.02	33.90	32.10	33.70	33.68	33.93
	20	33.05	32.88	32.66	31.56	32.38	32.63	32.75
	25	32.05	31.89	31.69	30.44	31.32	31.55	31.76
	50	28.86	28.83	28.61	27.35	27.79	27.51	28.47
Barbara	10	34.98	34.95	34.03	33.18	34.42	33.83	33.80
	15	33.11	32.70	31.86	30.77	32.37	32.21	32.35
	20	31.78	31.55	30.32	30.27	30.83	30.88	31.13
	25	30.72	30.39	29.13	29.01	29.60	29.77	30.07
	50	27.17	26.84	25.48	25.62	25.47	24.91	26.41
Boats	10	33.92	33.93	33.58	32.93	33.64	33.18	32.94
	15	32.14	31.93	31.70	30.70	31.73	31.45	31.52
	20	30.88	30.71	30.38	29.73	30.36	30.16	30.42
	25	29.91	29.68	29.37	28.56	29.28	29.11	29.43
	50	26.64	26.40	26.38	25.25	25.95	25.13	26.22
Peppers	10	34.68	34.77	33.77	33.51	34.28	33.87	33.53
	15	32.70	32.53	31.74	31.07	32.22	32.06	32.03
	20	31.29	31.31	30.31	30.04	30.82	30.75	30.82
	25	30.16	30.16	29.21	28.68	29.73	29.77	29.78
	50	26.41	26.49	25.90	24.17	26.13	23.84	26.28
House	10	36.71	36.18	35.35	34.91	35.98	35.67	35.78
	15	34.94	34.33	33.64	32.70	34.32	34.23	34.23
	20	33.77	33.33	32.39	32.43	33.20	33.24	33.11
	25	32.86	32.48	31.40	31.18	32.15	32.30	32.15
	50	29.37	29.04	28.26	27.62	27.95	27.64	28.38