A novel 3D profile measurement method based on digital photoelastic technology

2019 ◽  
Author(s):  
Guanjun Chen ◽  
Bo Tao ◽  
Gongfa Li ◽  
Shuang Xu ◽  
Fei Zeng
Keyword(s):  
Measurement Method ◽  
Profile Measurement ◽  
3D Profile

A weighted fusion method with multi-system for improving measurement accuracy of structured light 3D profilometry

2021 ◽  
Author(s):  
Chao Xing ◽  
Junhui Huang ◽  
Zhao Wang ◽  
Jianmin Gao
Keyword(s):  
Measurement Errors ◽  
Measurement Accuracy ◽  
Structured Light ◽  
Profile Measurement ◽  
Complex Surfaces ◽  
3D Profilometry ◽  
Weighted Fusion ◽  
Multiple Measurements ◽  
Geometric Relationship ◽  
3D Profile

Abstract It is a challenge to improve the accuracy of 3D profile measurement based on binary coded structured light for complex surfaces. A new method of weighted fusion with multi-system is presented to reduce the measurement errors due to the stripe grayscale asymmetry, which is based on the analysis of stripe center deviation related to surface normal and the directions of incident and reflected rays. First, the stripe center deviation model is established according to the geometric relationship between the stripe center deviation, the incident and reflected angles at any measured point. The influence of each variable on stripe center deviation is analyzed, and three subsystems are formed by a binocular structured light framework to achieve multiple measurements based on the influence regularity. Then in order to improve the measurement accuracy, different weights are assigned to the measured point in different subsystems according to the stripe center deviation model and its relationship with measurement error, and the weighted data from different subsystems are fused. Experiments are carried out to validate the presented method, and the experimental results demonstrate that it effectively improves the measurement accuracy of complex surfaces and measurement accuracy is improved by about 27% compared with the conventional method.

Wide Field of View Turbulence Profile Measurement Method

2018 ◽  
Vol 45 (8) ◽  
pp. 0804003
Author(s):  
方玉亮 Fang Yuliang ◽  
金振宇 Jin Zhenyu ◽  
刘忠 Liu Zhong ◽  
李正刚 Li Zhenggang
Keyword(s):  
Measurement Method ◽  
Field Of View ◽  
Profile Measurement ◽  
Wide Field ◽  
Wide Field Of View

An absolute phase technique for 3D profile measurement using four-step structured light pattern

2012 ◽  
Vol 50 (9) ◽  
pp. 1274-1280 ◽  
Author(s):  
Jing Xu ◽  
Shaoli Liu ◽  
An Wan ◽  
Bingtuan Gao ◽  
Qiang Yi ◽  
...  
Keyword(s):  
Structured Light ◽  
Profile Measurement ◽  
Light Pattern ◽  
Absolute Phase ◽  
3D Profile

Accurate profile measurement method for industrial stereo-vision systems

Sensor Review ◽  
2020 ◽  
Vol 40 (4) ◽  
pp. 445-453
Author(s):  
Yang Zhang ◽  
Wei Liu ◽  
Yongkang Lu ◽  
Xikang Cheng ◽  
Weiqi Luo ◽  
...  
Keyword(s):  
Stereo Vision ◽  
Measurement Method ◽  
Vision System ◽  
Practical Implication ◽  
Image Features ◽  
Reference Points ◽  
Profile Measurement ◽  
Surface Boundary ◽  
Content Type ◽  
Profile Reconstruction

Purpose Profile measurement with boundary information plays a vital role in the detection of quality in the assembly of aviation parts. The purpose of this paper is to improve the evaluation accuracy of the aerodynamic shapes of airplanes, the profiles of large-sized parts need to be measured accurately. Design/methodology/approach In this paper, an accurate profile measurement method based on boundary reference points is proposed for the industrial stereo-vision system. Based on the boundary-reference points, the authors established a priori constraint for extracting the boundary of the measured part. Combining with the image features of background and the measured part, an image-edge compensation model is established to extract the boundary of the measured part. The critical point of a laser stripe on the edge of the measured part is extracted corresponding to the boundary constraint. Finally, as per the principle of binocular vision, the profile of the measured part is reconstructed. Finding Laboratory experiments validate the measurement accuracy of the proposed method which is 0.33 mm. In the analysis of results between the measured data and the theoretical model, the measuring accuracy of the proposed method was found to be significantly higher than that of the other traditional methods. Practical implication An aviation part was measured in the part-assembly shop by the proposed method, which verified the feasibility and effectiveness of this method. The research can realize the measurement of smooth surface boundary which can solve existing profile reconstruction problems for aviation parts. Originality/value According to the two-dimensional contour constraint, critical points of the laser strip sequence at the edge of measured part are extracted and the accurate profile reconstruction with the boundary is realized.

Research on Tooth Profile Deviations Measurement Method Based on the Optical Image Measuring Instrument

2013 ◽  
Vol 712-715 ◽  
pp. 1979-1982 ◽  
Author(s):  
Qing Hai Wang ◽  
Feng Xia Zhao
Keyword(s):  
Mathematical Models ◽  
Measurement Method ◽  
Tooth Profile ◽  
Optical Image ◽  
New Method ◽  
Profile Measurement ◽  
Measuring Instrument ◽  
Profile Deviation ◽  
Form Deviation ◽  
Fitting Error

To resolve the problems of small module gear measurement with traditional methods, a new method for measuring the tooth profile deviations of small module gear using the optical image measuring instrument is put forward. According to the ISO 1328-1, the mathematical models of total profile deviation, profile form deviation and profile slope deviation are proposed. The involute profile measurement schemes are given. The results show that tooth profile coordinate values of small module gear can be measured automatically and effectively with the optical image measuring instrument, and the provided method has higher precision of getting measuring points and less fitting error of tooth profile.

3D Profile measurement using a multi-gray scale compared with reference projections

Measurement ◽  
1997 ◽  
Vol 20 (2) ◽  
pp. 129-134 ◽  
Author(s):  
R. Furutani ◽  
H. Asano ◽  
K. Takamasu ◽  
S. Ozono
Keyword(s):  
Profile Measurement ◽  
Gray Scale ◽  
3D Profile
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