Table 2.

Grain length and grain width measured manually versus automatically (sample size = 50)

No.	Grain length (mm)				Grain width (mm)
	Automatic measurement	Manual measurement	Absolute error	Relative error	Automatic measurement	Manual measurement	Absolute error	Relative error
1	7.34	7.31	0.03	0.46%	3.43	3.37	0.06	1.82%
2	7.32	7.35	0.03	0.36%	3.31	3.41	0.10	2.85%
3	7.23	7.10	0.13	1.88%	3.33	3.21	0.12	3.85%
4	7.43	7.31	0.12	1.65%	3.43	3.27	0.16	4.91%
5	7.19	7.14	0.05	0.66%	3.19	3.23	0.04	1.25%
6	7.45	7.19	0.27	3.69%	3.29	3.23	0.06	1.91%
7	7.31	7.26	0.06	0.76%	3.19	3.24	0.05	1.54%
8	7.12	7.09	0.03	0.38%	3.22	3.32	0.10	2.94%
9	7.38	7.29	0.08	1.14%	3.32	3.29	0.03	0.84%
10	7.39	7.31	0.08	1.14%	3.30	3.33	0.03	0.81%
11	7.41	7.20	0.21	2.97%	3.24	3.28	0.04	1.23%
12	7.40	7.21	0.19	2.62%	3.29	3.22	0.07	2.15%
13	7.25	7.13	0.12	1.61%	3.29	3.33	0.04	1.11%
14	7.16	7.13	0.03	0.46%	3.29	3.23	0.07	2.07%
15	7.39	7.23	0.15	2.14%	3.26	3.32	0.06	1.86%
16	7.51	7.31	0.20	2.76%	3.28	3.33	0.05	1.39%
17	7.19	7.13	0.06	0.91%	3.26	3.28	0.02	0.52%
18	7.46	7.29	0.16	2.25%	3.37	3.40	0.03	0.79%
19	7.27	7.28	0.01	0.14%	3.30	3.30	0.00	0.02%
20	7.29	7.20	0.09	1.28%	3.32	3.36	0.04	1.33%
21	7.32	7.23	0.09	1.29%	3.24	3.33	0.09	2.57%
22	7.33	7.25	0.07	0.98%	3.29	3.36	0.07	2.15%
23	7.52	7.37	0.15	2.09%	3.24	3.39	0.15	4.48%
24	7.38	7.32	0.06	0.85%	3.28	3.37	0.08	2.48%
25	7.33	7.33	0.00	0.01%	3.32	3.43	0.11	3.07%
26	7.36	7.22	0.14	1.94%	3.29	3.31	0.02	0.65%
27	7.36	7.19	0.17	2.39%	3.33	3.29	0.04	1.09%
28	7.28	7.29	0.01	0.14%	3.31	3.29	0.02	0.67%
29	7.24	7.18	0.06	0.81%	3.27	3.29	0.02	0.60%
30	7.42	7.28	0.15	2.00%	3.48	3.41	0.07	2.05%
31	7.33	7.27	0.06	0.82%	3.24	3.33	0.09	2.71%
32	7.29	7.11	0.19	2.61%	3.36	3.27	0.10	2.94%
33	7.47	7.35	0.12	1.68%	3.31	3.31	0.00	0.03%
34	7.26	7.24	0.02	0.21%	3.41	3.41	0.00	0.00%
35	7.59	7.42	0.17	2.22%	3.42	3.39	0.03	0.92%
36	7.31	7.18	0.13	1.80%	3.26	3.21	0.05	1.41%
37	7.36	7.20	0.16	2.16%	3.35	3.33	0.02	0.47%
38	7.50	7.26	0.23	3.22%	3.34	3.30	0.05	1.42%
39	7.36	7.28	0.08	1.09%	3.36	3.35	0.01	0.28%
40	7.12	7.13	0.02	0.26%	3.14	3.17	0.03	0.80%
41	7.34	7.15	0.19	2.67%	3.32	3.31	0.01	0.24%
42	7.21	7.26	0.05	0.69%	3.24	3.31	0.08	2.29%
43	7.39	7.20	0.19	2.64%	3.36	3.38	0.02	0.46%
44	7.37	7.24	0.13	1.75%	3.35	3.37	0.02	0.48%
45	7.38	7.32	0.06	0.78%	3.32	3.38	0.06	1.74%
46	7.24	7.20	0.03	0.46%	3.37	3.35	0.02	0.59%
47	7.42	7.26	0.16	2.23%	3.30	3.34	0.05	1.41%
48	7.59	7.39	0.21	2.79%	3.35	3.36	0.01	0.21%
49	7.38	7.32	0.05	0.73%	3.37	3.39	0.02	0.63%
50	7.28	7.23	0.05	0.68%	3.30	3.30	0.00	0.10%
Mean value	7.34	7.24	0.11	1.47%	3.31	3.32	0.04	1.31%