2D In Situ Method for Measuring Plant Leaf Area with Camera Correction and Background Color Calibration

Table 1

Measurement results for green standard rectangular gauge blocks of known area in the leaf area measuring instrument.

Gauge block size (mm)	True area (mm^2)	Measurement area (mm^2)		Absolute errors (mm^2)		Relative errors (%)
		BCC	LAS	BCC	LAS	BCC	LAS
10 × 10	100	100.6049	100.7245	0.6049	0.7245	0.60%	0.72%
10 × 30	300	299.8115	300.7694	−0.1885	0.7694	−0.063%	0.26%
10 × 50	500	499.9739	498.9632	−0.0261	−1.0368	−0.01%	−0.21%
10 × 70	700	704.8353	704.6375	4.8353	4.6375	0.69%	0.66%
20 × 20	400	402.8942	403.2312	2.8942	3.2312	0.72%	0.81%
20 × 40	800	799.1554	800.3269	−0.8446	0.3269	−0.11%	0.04%
20 × 60	1200	1179.5257	1178.3601	−20.4743	−21.6399	−1.71	−1.80%
20 × 80	1600	1580.0575	1579.3269	−19.9425	−20.6731	−1.25%	−1.29%
30 × 30	900	912.4805	913.3562	12.4805	13.3562	1.39%	1.48%
30 × 50	1500	1529.1216	1528.3687	29.1216	28.3687	1.94%	1.89%
30 × 70	2100	2101.2611	2098.6356	1.2611	−1.3644	0.06%	−0.06%
30 × 90	2700	2693.7398	2694.3265	−6.2602	−5.6735	−0.23%	−0.21%
40 × 40	1600	1630.4814	1631.2569	30.4814	31.2569	1.91%	1.95%
40 × 60	2400	2392.2876	2390.3265	−7.7124	−9.6735	−0.32%	−0.40%
40 × 80	3200	3195.1911	3195.3621	−4.8089	−4.6379	−0.15%	−0.14%
40 × 100	4000	4026.2894	4036.4693	26.2894	36.4693	0.66%	0.91%
50 × 50	2500	2497.2611	2496.3643	−2.7389	−3.6357	−0.11%	−0.15%
50 × 90	4500	4505.1212	4498.3657	5.1212	−1.6343	0.11%	−0.04%