3-Step-Calibration of 3D Vision Measurement System Based-on Structured Light

In structured light 3D vision measurement system, calibration tasks are key steps. Aiming at a special application of line structured light measurement, namely computer hard-disk surface planeness measurement at a precision equipment manufacturing company in Singapore, and combining with the structured light measurement model, determined three calibration tasks of the system. The three calibrating tasks concluded: calibrating the camera parameters; calibrating the light plane pose and calibrating the movement pose. At the same time, according to the three calibration results, measured the computer hard disk, and reconstructed the 3D model of the computer hard disk. The experimental results show that, the whole system of three calibration process is simple and reliable, the method does not need any auxiliary adjustment and realize the measurement accuracy about 0.023 mm. The work laid the better foundation for hard disk planeness vision measurement.

Download Full-text

Research on Calibration Method of Linear Structured Light Vision Measurement System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.1234 ◽

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.

Download Full-text

Embedded 3D vision measurement system based on the line structured light

Proceeding of the 11th World Congress on Intelligent Control and Automation ◽

10.1109/wcica.2014.7053750 ◽

2014 ◽

Cited By ~ 1

Author(s):

Zhao Wang ◽

Xuewei Cao ◽

Haitao Song ◽

Han Xiao ◽

Wenhao He ◽

...

Keyword(s):

Measurement System ◽

Structured Light ◽

3D Vision ◽

Vision Measurement

Download Full-text

3D Wide FOV Scanning Measurement System Based on Multiline Structured-Light Sensors

Advances in Mechanical Engineering ◽

10.1155/2014/758679 ◽

2014 ◽

Vol 6 ◽

pp. 758679 ◽

Cited By ~ 2

Author(s):

He Gao ◽

Fuqiang Zhou ◽

Bin Peng ◽

Yexin Wang ◽

Haishu Tan

Keyword(s):

Measurement System ◽

High Efficiency ◽

Structured Light ◽

Ccd Camera ◽

Measurement Range ◽

Object Surface ◽

3D Vision ◽

Vision Measurement ◽

Measurement Area ◽

Wide Fov

Structured-light three-dimensional (3D) vision measurement is currently one of the most common approaches to obtain 3D surface data. However, the existing structured-light scanning measurement systems are primarily constructed on the basis of single sensor, which inevitably generates three obvious problems: limited measurement range, blind measurement area, and low scanning efficiency. To solve these problems, we developed a novel 3D wide FOV scanning measurement system which adopted two multiline structured-light sensors. Each sensor is composed of a digital CCD camera and three line-structured-light projectors. During the measurement process, the measured object is scanned by the two sensors from two different angles at a certain speed. Consequently, the measurement range is expanded and the blind measurement area is reduced. More importantly, since six light stripes are simultaneously projected on the object surface, the scanning efficiency is greatly improved. The Multiline Structured-light Sensors Scanning Measurement System (MSSS) is calibrated on site by a 2D pattern. The experimental results show that the RMS errors of the system for calibration and measurement are less than 0.092 mm and 0.168 mm, respectively, which proves that the MSSS is applicable for obtaining 3D object surface with high efficiency and accuracy.

Download Full-text