Text Extraction from Historical Document Images by the Combination of Several Thresholding Techniques

Table 2

Average results obtained on the test dataset.

		Execution time (ms)	-measure; (%)	PSNR	NRM; (10^−2)	MPM; (10^−3)	DRD
Global	Otsu [6]	458,75	80,565	15,716	8.83	2.961	26.208
	Kapur et al. [8]	520,828	81,921	15,692	8.109	2.059	23.104
	IGT	309,543	76,556	14,307	10.11	2.778	28.73
Local	Niblack [11]	78504.1	66.88	7.78	11.47	18.239	43.42
	Sauvola and Pietikäinen [3]	73914.2	85.68	18.62	7.95	1.254	6.13
	Nick	72480.9	82.22	19.047	9.31	2.201	5.27
Hybrid	Improved IGT	487,943	78,039	14,728	12.05	3.72	22.78
	Gangamma and Srikanta [14]	73999,157	69,187	13,469	21.71	15.43	38.81
	Background Subtraction thresholding	1122,057	68,907	13,432	22.34	17.75	40.97
	Tabatabaei and Bohlool [16]	75875	85.82	26.69	8.2	1.183	3.439
	Proposed Approche	1417.86	87.44	27.97	6.74	1.025	3.161