A calibration method on 3D measurement based on structured-light with single camera

2020 ◽  
Author(s):  
Shanshan Wang ◽  
Jiong Liang ◽  
Xiu Li ◽  
Fan Su ◽  
Zhenshan Zhao
Keyword(s):  
Structured Light ◽  
Calibration Method ◽  
Single Camera ◽  
3D Measurement

Temporal Matrices Mapping-Based Calibration Method for Event-Driven Structured Light Systems

2021 ◽  
Vol 21 (2) ◽  
pp. 1799-1808
Author(s):  
Guijin Wang ◽  
Chenchen Feng ◽  
Xiaowei Hu ◽  
Huazhong Yang
Keyword(s):  
Structured Light ◽  
Calibration Method ◽  
Event Driven ◽  
Structured Light Systems

scholarly journals Calibration Method for Line-Structured Light Three-Dimensional Measurements Based on a Single Circular Target

2022 ◽  
Vol 12 (2) ◽  
pp. 588
Author(s):  
Jun Wang ◽  
Xuexing Li
Keyword(s):  
Structured Light ◽  
Three Dimensional ◽  
Calibration Method ◽  
Optical Center ◽  
3D Measurements ◽  
Light Plane ◽  
Laser Projector ◽  
Dimensional Measurements ◽  
Intersection Points ◽  
Circular Target

Single circular targets are widely used as calibration objects during line-structured light three-dimensional (3D) measurements because they are versatile and easy to manufacture. This paper proposes a new calibration method for line-structured light 3D measurements based on a single circular target. First, the target is placed in several positions and illuminated by a light beam emitted from a laser projector. A camera captures the resulting images and extracts an elliptic fitting profile of the target and the laser stripe. Second, an elliptical cone equation defined by the elliptic fitting profile and optical center of the camera is established based on the projective geometry. By combining the obtained elliptical cone and the known diameter of the circular target, two possible positions and orientations of the circular target are determined and two groups of 3D intersection points between the light plane and the circular target are identified. Finally, the correct group of 3D intersection points is filtered and the light plane is progressively fitted. The accuracy and effectiveness of the proposed method are verified both theoretically and experimentally. The obtained results indicate that a calibration accuracy of 0.05 mm can be achieved for an 80 mm × 80 mm planar target.

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