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- Title
Flexiblemethod for accurate calibration of large-scale vision metrology system based on virtual 3-D targets and laser tracker.
- Authors
Xi Zhang; Yuanzhi Xu; Haichao Li; Lijing Zhu; Xin Wang; Wei Li
- Abstract
For the purpose of obtaining high-precision in stereo vision calibration, a large-size precise calibration target, which can cover more than half of the field of view is vital. However, large-scale calibration targets are very difficult to fabricate. Based on the idea of error tracing, a high-precision calibration method for vision system with large field of view by constructing a virtual 3-D calibration target with a laser tracker was proposed in this article. A virtual 3-D calibration target that covers the whole measurement space can be established flexibly and the measurement precision of the vision system can be traceable to the laser tracker. First, virtual 3-D targets by calculating rigid body transformation with unit quaternion method were constructed. Then, the high-order distortion camera model was taken into consideration. Besides, the calibration parameters were solved with Levenberg--Marquardt optimization algorithm. In the experiment, a binocular stereo vision system with the field of view of 4 x 3 x 2m³ was built for verifying the validity and precision of the proposed calibration method. It is measured that the accuracy with the proposed method can be greatly improved comparing with traditional plane calibration method. The method can be widely used in industrial applications, such as in the field of calibrating large-scale vision-based coordinate metrology, and six-degrees of freedom pose tracking system for dimensional measurement of workpiece, as well as robotics geometrical accuracy detection and compensation.
- Subjects
COORDINATE measuring machines; STEREO vision (Computer science); CALIBRATION; BINOCULAR vision; MARQUARDT algorithm; VISION; VISUAL fields
- Publication
International Journal of Advanced Robotic Systems, 2019, Vol 16, Issue 6, p1
- ISSN
1729-8806
- Publication type
Article
- DOI
10.1177/1729881419893516