High precision calibration of line structured light sensors based on linear transformation over triangular domain

2016 ◽  
Author(s):  
Yuehua Li ◽  
Jingbo Zhou ◽  
Fengshan Huang
Keyword(s):  
High Precision ◽  
Linear Transformation ◽  
Structured Light ◽  
Triangular Domain

scholarly journals A High-Precision Registration Technology Based on Bundle Adjustment in Structured Light Scanning System

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Jianying Yuan ◽  
Qiong Wang ◽  
Xiaoliang Jiang ◽  
Bailin Li
Keyword(s):  
High Precision ◽  
Large Scale ◽  
Structured Light ◽  
Bundle Adjustment ◽  
Scanning System ◽  
Control Points ◽  
Registration Method ◽  
Global Control ◽  
3D Data ◽  
Structured Light Scanning

The multiview 3D data registration precision will decrease with the increasing number of registrations when measuring a large scale object using structured light scanning. In this paper, we propose a high-precision registration method based on multiple view geometry theory in order to solve this problem. First, a multiview network is constructed during the scanning process. The bundle adjustment method from digital close range photogrammetry is used to optimize the multiview network to obtain high-precision global control points. After that, the 3D data under each local coordinate of each scan are registered with the global control points. The method overcomes the error accumulation in the traditional registration process and reduces the time consumption of the following 3D data global optimization. The multiview 3D scan registration precision and efficiency are increased. Experiments verify the effectiveness of the proposed algorithm.

Research on Calibration Method of Linear Structured Light Vision Measurement System

2014 ◽  
Vol 644-650 ◽  
pp. 1234-1239
Author(s):  
Tao He ◽  
Yu Lang Xie ◽  
Cai Sheng Zhu ◽  
Jiu Yin Chen
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Structured Light ◽  
Target Position ◽  
Calibration Method ◽  
Measurement Model ◽  
Sensor Calibration ◽  
Vision Measurement ◽  
Set Up ◽  
Structured Light Vision

This template explains and demonstrates how to design a measurement system based on the size of the linear structured light vision, the system could works at realized the high precision and fast measurement of the size of mechanical parts, and accurate calibration of the system. First of all, this paper set up the experimental platform based on linear structured light vision measurement. Secondly, this paper established a system of measurement model, and puts forward a new method of calibration of structured light sensor and set up the mathematical model of sensor calibration. This calibration method only need to use some gage blocks of high precision as the target, the target position need not have a strict requirements, and the solving process will be more convenient, much easier to field use and maintenance. Finally, measuring accuracy on the system by gage blocks with high precision is verified, the experiment shows that measurement accuracy within 0.050 mmin the depth of 0-80 - mm range. This system can satisfy the demands of precision testing of most industrial parts .with its simple calibration process and high precision, it is suitable for the structured light vision calibration.

scholarly journals Reliable and Accurate Wheel Size Measurement under Highly Reflective Conditions

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4296 ◽  
Author(s):  
Xiao Pan ◽  
Zhen Liu ◽  
Guangjun Zhang
Keyword(s):  
High Precision ◽  
Signal To Noise Ratio ◽  
Structured Light ◽  
Measurement Reliability ◽  
Size Measurement ◽  
Vision Sensor ◽  
High Precision Measurement ◽  
Measurement Framework ◽  
Improve Measurement ◽  
Structured Light Vision

Structured-light vision sensor, as an important tool for obtaining 3D data, is widely used in fields of online high-precision measurement. However, the captured stripe images can show high-dynamic characteristics of low signal-to-noise ratio and uneven brightness due to the complexity of the onsite environment. These conditions seriously affect measurement reliability and accuracy. In this study, a wheel size measurement framework based on a structured-light vision sensor, which has high precision and reliability and is suitable for highly reflective conditions, is proposed. Initially, the quality evaluation criterion of stripe images is established, and the entire stripe is distinguished into high- and low-quality segments. In addition, the multi-scale Retinex theory is adopted to enhance stripe brightness, which improves the reliability of subsequent stripe center extraction. Experiments verify that this approach can remarkably improve measurement reliability and accuracy and has important practical value.

scholarly journals Adaptive Structured Light with Scatter Correction for High-Precision Underwater 3D Measurements

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1043 ◽  
Author(s):  
Petter Risholm ◽  
Trine Kirkhus ◽  
Jens Thielemann ◽  
Jostein Thorstensen
Keyword(s):  
High Precision ◽  
Structured Light ◽  
Scatter Correction ◽  
Gray Code ◽  
Forward Scatter ◽  
Phase Stepping ◽  
Accuracy And Precision ◽  
Phase Unwrap ◽  
Phase Estimate ◽  
Frequency Phase

High-precision underwater 3D cameras are required to automate many of the traditional subsea inspection, maintenance and repair (IMR) operations. In this paper we introduce a novel multi-frequency phase stepping (structured light) method for high-precision 3D estimation even in turbid water. We introduce an adaptive phase-unwrapping procedure which uses the phase-uncertainty to determine the highest frequency that can be reliably unwrapped. Light scattering adversely affects the phase estimate. We propose to remove the effect of forward scatter with an unsharp filter and a model-based method to remove the backscatter effect. Tests in varying turbidity show that the scatter correction removes the adverse effect of scatter on the phase estimates. The adaptive frequency unwrapping with scatter correction results in images with higher accuracy and precision and less phase unwrap errors than the Gray-Code Phase Stepping (GCPS) approach.

scholarly journals Data-driven Laser Plane Optimization for High-precision Numerical Calibration of Line Structured Light Sensors

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Jingbo Zhou ◽  
Laisheng Pan ◽  
Yuehua Li ◽  
Renjie Du ◽  
Fuxiang Zhang
Keyword(s):  
High Precision ◽  
Structured Light ◽  
Data Driven ◽  
Laser Plane

High precision FPGA real-time linear structured light imaging system

2021 ◽  
Author(s):  
Lin Gu ◽  
Zhongwen Fei ◽  
Wen Wang ◽  
Jialin Wu ◽  
Xiaobin Xu
Keyword(s):  
Real Time ◽  
High Precision ◽  
Imaging System ◽  
Structured Light ◽  
Time Linear
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