Laser & Optoelectronics Progress, Volume. 56, Issue 22, 221101(2019)
Calibration Method for Line-Structured Light
Figures & Tables(10)
Fig. 6. Three-dimensional point clouds after encapsulation. (a) Top view; (b) front view
Table 1. Calibration results of two calibration methods
View tableTable 1. Calibration results of two calibration methods
Method of calibration Number of feature points Equation of light plane Invariance of cross-ratio 8 0.999438 X -0.0333133Y -0.00363374Z +68.6157=0Our method All feature points on the light stripe 0.999414 X -0.0340966Y +0.00295146Z +65.1016=0
Table 2. Evaluation results of calibration results of two calibration methods
View tableTable 2. Evaluation results of calibration results of two calibration methods
Method of calibration Number of feature points Sum of the distances /mm Invariance of cross-ratio All feature points 32.74879 Out method All feature points 31.73931
Table 3. Measurement results of cylinder head based on proposed method
View tableTable 3. Measurement results of cylinder head based on proposed method
Gas cavity X directionY directionZ directionStand- ard / mm Meas- ured / mm Absolute error / mm Relative error / % Stand- ard / mm Meas- ured / mm Absolute error / mm Relative error / % Stand- ard / mm Meas- ured / mm Absolute error / mm Relative error / % A 1261.12 261.21 0.09 0.034 47.30 47.21 0.09 0.190 / / / / B 1261.12 261.09 0.03 0.011 0.00 0.10 0.10 / / / / / C 1274.82 274.90 0.08 0.029 131.65 131.69 0.04 0.030 52.30 52.64 0.34 0.650 A 2130.56 130.50 0.06 0.045 47.30 47.25 0.05 0.105 / / / / B 2130.56 130.63 0.07 0.053 0.00 0.09 0.09 / / / / / C 2144.26 144.35 0.09 0.062 131.65 131.60 0.05 0.037 52.30 52.56 0.26 0.497 A 30 0.08 0.08 / 47.30 47.40 0.10 0.211 / / / / B 30 0 0 / 0 0.09 0.09 / / / / / C 313.70 13.75 0.05 0.360 131.65 131.70 0.05 0.037 52.30 52.65 0.35 0.669 A 4130.56 130.62 0.06 0.045 47.30 47.40 0.10 0.211 / / / / B 4130.56 130.48 0.08 0.061 0.00 0.06 0.06 / / / / / C 4116.86 116.96 0.10 0.085 131.65 131.60 0.05 0.037 52.30 52.45 0.15 0.287
Table 4. Measurement results of cylinder head obtained by cross ratio invariance based calibration method
View tableTable 4. Measurement results of cylinder head obtained by cross ratio invariance based calibration method
Gas cavity X directionY directionZ directionStand- ard / mm Meas- ured / mm Absolute error / mm Relative error / % Stand- ard / mm Meas- ured / mm Absolute error / mm Relative error / % Stand- ard / mm Meas- ured / mm Absolute error / mm Relative error / % A1 261.12 261.21 0.09 0.034 47.30 47.21 0.09 0.190 / / / / B 1261.12 261.09 0.03 0.011 0.00 0.11 0.11 / / / / / C 1274.82 274.90 0.08 0.029 131.65 131.97 0.32 0.243 52.30 52.99 0.69 1.319 A 2130.56 131.20 0.64 0.490 47.30 47.16 0.14 0.295 / / / / B 2130.56 130.16 0.40 0.306 0.00 0.38 0.38 / / / / / C 2144.26 144.88 0.62 0.429 131.65 131.97 0.32 0.243 52.30 53.21 0.91 1.739 A 30 -0.08 0.08 / 47.30 47.45 0.15 0.317 / / / / B 30 0 0 / 0 0 0 / / / / / C 313.70 13.75 0.05 0.360 131.65 131.97 0.32 0.243 52.30 52.64 0.34 0.650 A 4130.56 130.33 0.23 0.176 47.30 46.93 0.37 0.782 / / / / B 4130.56 130.38 0.18 0.137 0.00 0.15 0.15 / / / / / C 4116.86 117.22 0.36 0.308 131.65 131.97 0.32 0.243 52.30 52.46 0.16 0.305
Tools
Get Citation
Copy Citation Text
Ruifeng Zhang, Ziyun Shu, Ganglei Nan. Calibration Method for Line-Structured Light[J]. Laser & Optoelectronics Progress, 2019, 56(22): 221101
Paper Information
Category: Imaging Systems
Received: Mar. 14, 2019
Accepted: May. 13, 2019
Published Online: Nov. 2, 2019
The Author Email: Shu Ziyun (szy826@tju.edu.cn)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20