Table 1 Subjective grading on binarized images obtained before and after shadow compensation. Notation: WOSR – Without shadow compensation; WSR – With shadow compensation; SD – Standard deviation.

	Grader	Data	Attempt	Mean (µ) (%)	SD (σ) (%)	Min (%)	Max (%)
Image-1	A	WOSR	1	57.59	10.59	30	70
		WOSR	2	59.44	10.22	40	75
		WSR	1	85.37	5.53	70	95
		WSR	2	83.89	3.20	75	90
	B	WOSR	1	46.66	17.54	20	80
		WOSR	2	54.07	16.41	30	75
		WSR	1	75.93	14.87	30	95
		WSR	2	82.96	9.22	60	90
Image-2	A	WOSR	1	49.81	10.60	30	65
		WOSR	2	54.44	10.68	30	75
		WSR	1	84.81	5.27	70	95
		WSR	2	83.70	4.29	75	90
	B	WOSR	1	41.11	17.83	20	70
		WOSR	2	45.00	18.86	20	70
		WSR	1	72.22	17.88	30	95
		WSR	2	80.92	9.91	60	90
Image-3	A	WOSR	1	47.22	10.59	30	65
		WOSR	2	51.29	11.23	30	75
		WSR	1	83.70	6.14	70	95
		WSR	2	83.33	4.80	70	90
	B	WOSR	1	38.33	17.15	20	70
		WOSR	2	43.33	17.15	20	75
		WSR	1	70.74	19.05	20	95
		WSR	2	81.29	8.50	60	90
Image-4	A	WOSR	1	52.96	9.83	35	70
		WOSR	2	54.07	9.51	35	70
		WSR	1	85.18	4.04	75	95
		WSR	2	84.44	4.45	75	90
	B	WOSR	1	42.22	14.82	15	80
		WOSR	2	46.29	14.97	30	80
		WSR	1	73.14	17.65	40	95
		WSR	2	83.89	5.43	70	90
Image-5	A	WOSR	1	53.89	10.12	35	70
		WOSR	2	53.37	9.39	40	65
		WSR	1	85.00	5.88	70	95
		WSR	2	83.89	5.43	65	90
	B	WOSR	1	46.29	17.51	10	80
		WOSR	2	50.00	13.87	20	80
		WSR	1	75.93	19.56	0	90
		WSR	2	83.33	15.50	10	90
Overall	A	WOSR	1	55.37	9.19	35	70
		WOSR	2	57.22	9.54	40	70
		WSR	1	85.74	3.85	80	95
		WSR	2	84.07	4.39	75	90
	B	WOSR	1	44.81	13.83	20	75
		WOSR	2	48.88	13.68	30	75
		WSR	1	75.00	10.93	45	95
		WSR	2	83.33	6.93	65	95

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