EURASIP Journal on Image and Video Processing

Table 4 Alternative filtering quality measures for grayscale color image “clock” (IEF, SSIM, and EPI)

From: BM3D filter in salt-and-pepper noise removal

	20 %	40 %	60 %	80 %	90 %	95 %	97.5 %
IEF	128.57	91.87	73.80	61.95	46.19	33.81	27.59
	396.87	244.12	156.46	107.60	66.77	42.51	32.21
	497.86	358.55	254.93	158.33	88.00	52.42	37.76
SSIM	0.98	0.94	0.89	0.83	0.78	0.72	0.67
	0.99	0.97	0.93	0.89	0.84	0.77	0.72
	0.99	0.97	0.94	0.90	0.84	0.78	0.74
EPI	0.90	0.74	0.60	0.47	0.42	0.40	0.54
	0.97	0.90	0.81	0.67	0.61	0.56	0.54
	0.97	0.94	0.88	0.77	0.69	0.64	0.61

Upper row - decision-based/adaptive median filters; middle row - proposed scheme after single iteration by BM3D filter; bottom row - proposed scheme after five iterations by BM3D filter

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