Convenient Calibration Procedure for Structured Light Projection System

We present a convenient calibration method for structured light projection system. The proposed clibration approach can realize 3D shape measurement without projector calibration, without system calibration, without precise linear z stage to be used, the relative position between camera and projector can be arbitrary, and the only involved device is a plane board. Experiment results validated that the accuracy of the proposed approach.

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Surface Reconstruction of Microscale Objects Based on Grid-Patterned Structured-Light Measurements

Microscopy and Microanalysis ◽

10.1017/s1431927621013829 ◽

2021 ◽

pp. 1-21

Author(s):

Yuezong Wang ◽

Jiqiang Chen ◽

Youfan Peng

Keyword(s):

Real Time ◽

Surface Reconstruction ◽

Metal Surfaces ◽

Structured Light ◽

Three Dimensional ◽

Shape Measurement ◽

Grid Node ◽

Projection System ◽

3D Shape ◽

3D Shape Measurement

A structured-light projection system was designed for microscale objects with surface heights that ranged from tens to hundreds of microns. The system was composed of a universal projector and microscope system that supported editing the attributes of structured-light patterns in real-time and was capable of projecting microscale patterns. On this basis, reconstructing the metal surfaces of microscale objects based on grid patterns of structured light was investigated, the internal and external parameters of microscope vision and projection systems were calibrated, and an image algorithm for grid-node detection was designed. The results indicated that the proposed method successfully reconstructed the three-dimensional (3D) surface of microscale objects, and the reconstruction results were consistent with the original surfaces. With 95% confidence, the reconstruction precision in the X- and Y-directions was approximately ±4.0 μm and in the Z-direction was approximately ±7.5 μm. The designed system and the proposed method were suitable for 3D-shape measurement of microstructures in microscopic fields and can be adapted to meet a broader range of applications, as compared to current methods.

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A three-step system calibration procedure with error compensation for 3D shape measurement

Chinese Optics Letters ◽

10.3788/col20100801.0033 ◽

2010 ◽

Vol 8 (1) ◽

pp. 33-37 ◽

Cited By ~ 6

Author(s):

崔海华 Haihua Cui ◽

廖文和 Wenhe Liao ◽

程筱胜 Xiaosheng Cheng ◽

戴宁 Ning Dai ◽

袁天然 Tianran Yuan

Keyword(s):

Error Compensation ◽

Calibration Procedure ◽

Shape Measurement ◽

System Calibration ◽

3D Shape ◽

3D Shape Measurement

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Single-shot 3D shape measurement of discontinuous objects based on a coaxial fringe projection system

Applied Optics ◽

10.1364/ao.58.00a169 ◽

2019 ◽

Vol 58 (5) ◽

pp. A169 ◽

Cited By ~ 19

Author(s):

Zhangying Wang ◽

Zonghua Zhang ◽

Nan Gao ◽

Yanjun Xiao ◽

Feng Gao ◽

...

Keyword(s):

Fringe Projection ◽

Shape Measurement ◽

Single Shot ◽

Projection System ◽

3D Shape ◽

3D Shape Measurement

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Hybrid 3D Shape Measurement Using the MEMS Scanning Micromirror

Micromachines ◽

10.3390/mi10010047 ◽

2019 ◽

Vol 10 (1) ◽

pp. 47 ◽

Cited By ~ 3

Author(s):

Tao Yang ◽

Guanliang Zhang ◽

Huanhuan Li ◽

Xiang Zhou

Keyword(s):

Laser Beam ◽

Microelectromechanical Systems ◽

Laser Source ◽

Shape Measurement ◽

Fusion Algorithm ◽

Projection System ◽

3D Shape ◽

3D Shape Measurement ◽

Complete Measurement ◽

3D Information

A surface with large reflection variations represents one of the biggest challenges for optical 3D shape measurement. In this work, we propose an alternative hybrid 3D shape measurement approach, which combines the high accuracy of fringe projection profilometry (FPP) with the robustness of laser stripe scanning (LSS). To integrate these two technologies into one system, first, we developed a biaxial Microelectromechanical Systems (MEMS) scanning micromirror projection system. In this system, a shaped laser beam serves as a light source. The MEMS micromirror projects the laser beam onto the object surface. Different patterns are produced by controlling the laser source and micromirror jointly. Second, a quality wised algorithm is delivered to develop a hybrid measurement scheme. FPP is applied to obtain the main 3D information. Then, LSS helps to reconstruct the missing depth guided by the quality map. After this, the data fusion algorithm is used to merge and output complete measurement results. Finally, our experiments show significant improvement in the accuracy and robustness of measuring a surface with large reflection variations. In the experimental instance, the accuracy of the proposed method is improved by 0.0278 mm and the integrity is improved by 83.55%.

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