Calibration of Linear Camera for Online Measurement of Lithium Battery Coating

Table 1. Camera calibration results
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Table 1. Camera calibration results
Calibration parameter Left camera Right camera
g_x 20.3687 20.3627
t_x 1970.5537 101.457
T_x -104.3465 -196.16979
Calibration error 0.6428 1.4497

Table 2. Camera calibration results
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Table 2. Camera calibration results
Calibration parameter Left camera Right camera
k₁ -2.0786×10^-10 -4.2328×10^-11
k₂ 2.9220×10^-17 1.5027×10^-18
u₀ 5181.8 6302
Coordinate errorafter correction 0.1794 0.3985

Table 3. Characteristic point u-direction coordinates

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Table 3. Characteristic point u-direction coordinates

Number	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
X_w /mm	0	10	20	30	40	50	60	70	80	90	100	110	120	130	140
u /pixel	10	242	474	706	938	1170	1403	1636	1868	2103	2337	2570	2804	3038	3272
Number	16	17	18	19	20	21	22	23	24	25	26	27	28	29
X_w /mm	150	160	170	180	190	200	210	220	230	240	250	260	270	280
u /pixel	3507	3741	3977	4211	4447	4681	4917	5152	5388	5623	5859	6094	6330	6566

Table 4. Field test datamm

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Table 4. Field test datamm

Section No.	Item	B₁	B₂	B₃	B₄	B₅	B₆	B₇
1	Actual value	15.036	172.358	28.742	172.768	30.197	171.92	15.154
	Measurement error	0.038	0.087	-0.078	0.001	-0.048	-0.068	0.019
2	Actual value	15.088	172.317	28.799	172.727	30.241	171.88	15.115
	Measurement error	0.035	0.072	-0.031	-0.059	-0.043	-0.028	0.009
3	Actual value	15.017	172.427	28.672	172.832	30.148	171.98	15.1
	Measurement error	0.057	0.018	-0.057	-0.063	0.001	-0.079	0.073
4	Actual value	15.076	172.322	28.775	172.727	30.241	171.9	15.162
	Measurement error	-0.002	-0.075	-0.061	-0.007	-0.043	-0.048	0.011

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Huaiguang Liu, Di Wang, Jintang Yang, Yuanjiong Liu. Calibration of Linear Camera for Online Measurement of Lithium Battery Coating[J]. Laser & Optoelectronics Progress, 2019, 56(11): 111501

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