Table 6. Qualitative results based on precision, sensitivity, F-measure, specificity, accuracy and PSNR for Method 2: Enhance grayscale images using contrast enhancement technique.

Type of cells	Precision	Sensitivity	Specificity	Accuracy	PSNR
Normal columnar	0.69	96.19	5.39	66.89	4.92
Normal intermediate	0.67	94.31	2.86	64.82	4.58
Normal superficial	0.51	96.59	0.82	49.92	3.00
Mild dysplastic	0.80	94.71	7.38	77.04	6.40
Moderate dysplastic	0.98	95.82	69.92	94.07	12.48
Severe dysplastic	1.00	95.33	99.95	95.41	14.80
Carcinoma in situ	0.94	95.25	39.21	89.51	10.19
Average	0.80	95.46	32.22	76.81	8.05