Coded-Structured Light System Calibration Using Orthogonal Phase Shift Coding Combined with Zhang’s Method

2014 ◽  
Vol 981 ◽  
pp. 348-351
Author(s):  
Xiao Yang Yu ◽  
Xiao Liang Meng ◽  
Hai Bin Wu ◽  
Xiao Ming Sun ◽  
Li Wang
Keyword(s):  
Phase Shift ◽  
Model Calibration ◽  
Structured Light ◽  
Calibration Method ◽  
Dimensional System ◽  
Plane Model ◽  
System Calibration ◽  
Calibration Process ◽  
Projector Calibration ◽  
Orthogonal Phase

In coded-structured light three dimensional system, system calibration plays a vital role for the measurement accuracy. The camera calibration method is very mature, but the study about projector calibration is less. Therefore, this paper proposes a projector calibration method with simple calibration process and high accuracy. This method combines the Zhang’?s plane model calibration method with orthogonal phase shift coding. In calibration process, this paper uses phase shift coding pattern to establish the relationship of projector image and camera corner point coordinates. According to the image coordinates in the projector’?s perspective, we program and calculate the projector’?s internal and external parameters matrix based on the Zhang’?s plane model calibration toolbox. The results show that the proposed method is simple and flexible, the maximum relative error of the calibration parameters is 0.03%, and it meets the requirements of system calibration in medical or industrial fields.

Convenient Calibration Procedure for Structured Light Projection System

2013 ◽  
Vol 662 ◽  
pp. 777-780
Author(s):  
Wen Guo Li ◽  
Shao Jun Duan
Keyword(s):  
Relative Position ◽  
Structured Light ◽  
Calibration Method ◽  
Calibration Procedure ◽  
Shape Measurement ◽  
Projection System ◽  
System Calibration ◽  
3D Shape ◽  
3D Shape Measurement ◽  
Projector Calibration

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.

scholarly journals Projector Calibration Method using Orthogonal Gray Code Combined with Trapezoid Phase Shift Code

2014 ◽  
Vol 9 (10) ◽  
pp. 1-8
Author(s):  
Xiaoyang Yu ◽  
Xiaoliang Meng ◽  
Haibin Wu ◽  
Tianjian Zang ◽  
Zhenyu Xiao
Keyword(s):  
Phase Shift ◽  
Calibration Method ◽  
Gray Code ◽  
Projector Calibration

A Camera Calibration Method Based on Plane Grid Points

2011 ◽  
Vol 230-232 ◽  
pp. 723-727 ◽  
Author(s):  
Bao Feng Zhang ◽  
Xiu Zhen Tian ◽  
Xiao Ling Zhang
Keyword(s):  
Camera Calibration ◽  
Model Calibration ◽  
Calibration Method ◽  
Translation Vector ◽  
Plane Model ◽  
Extrinsic Parameters ◽  
Computer Vision Systems ◽  
Grid Points ◽  
Intrinsic And Extrinsic Parameters ◽  
Plane Grid

In order to simplify previous camera calibration method, this paper put forward an easy camera calibration method based on plane grid points on the foundation of Heikkila plane model calibration method. Intrinsic and extrinsic parameters of the camera are calibrated with MATLAB, then the rotation matrix and the translation vector are calculated. The experiment results show this method is not only simple in practice, but also can meet the needs of computer vision systems.

scholarly journals On-Site Calibration Method for Line-Structured Light Sensor-Based Railway Wheel Size Measurement System

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6717
Author(s):  
Yunfeng Ran ◽  
Qixin He ◽  
Qibo Feng ◽  
Jianying Cui
Keyword(s):  
Structured Light ◽  
Field Tests ◽  
Calibration Method ◽  
Field Application ◽  
Calibration Error ◽  
Epipolar Constraint ◽  
Calibration Process ◽  
Calibration Methods ◽  
Calibration Accuracy ◽  
Calibration Time

Line-structured light has been widely used in the field of railway measurement, owing to its high capability of anti-interference, fast scanning speed and high accuracy. Traditional calibration methods of line-structured light sensors have the disadvantages of long calibration time and complicated calibration process, which is not suitable for railway field application. In this paper, a fast calibration method based on a self-developed calibration device was proposed. Compared with traditional methods, the calibration process is simplified and the calibration time is greatly shortened. This method does not need to extract light strips; thus, the influence of ambient light on the measurement is reduced. In addition, the calibration error resulting from the misalignment was corrected by epipolar constraint, and the calibration accuracy was improved. Calibration experiments in laboratory and field tests were conducted to verify the effectiveness of this method, and the results showed that the proposed method can achieve a better calibration accuracy compared to a traditional calibration method based on Zhang’s method.

Modeling and Calibration of Grid Structured Light Based 3-D Vision Inspection

1999 ◽  
Vol 122 (4) ◽  
pp. 734-738 ◽  
Author(s):  
Guangjun Zhang ◽  
Liqun Ma
Keyword(s):  
Mathematical Model ◽  
Coordinate System ◽  
Structured Light ◽  
Calibration Method ◽  
Experimental Results ◽  
Image Feature ◽  
Feature Analysis ◽  
Calibration Process ◽  
Vision Inspection ◽  
The Mathematical Model

The principle of structured light 3-D vision is introduced, and using projective and perspective transformations, the mathematical model of grid structured light based 3-D vision inspection is established in homogeneous coordinate system in this paper. Based on the image feature analysis of grid structured light, a calibration method of grid structured light based 3-D vision inspection is proposed, and experimental results are also presented. This method is easy, efficient and fast to carry out. It simplifies the calibration process while guaranteeing its accuracy. [S1087-1357(00)00703-6]

Digital Projector Calibration for 3-D Active Vision Systems

2000 ◽  
Vol 124 (1) ◽  
pp. 126-134 ◽  
Author(s):  
Tzung-Sz Shen ◽  
Chia-Hsiang Menq
Keyword(s):  
Rigid Body ◽  
Measurement Errors ◽  
Structured Light ◽  
Active Vision ◽  
Calibration Method ◽  
Lens Distortion ◽  
Vision Systems ◽  
Projector Calibration ◽  
Rigid Body Transformation ◽  
Light Beams

3-D active vision systems that project artificial structured light for coordinate measurements have been adopted in many industrial applications. With advances of electronic projection display technology, the digital projector is becoming an important component of various 3-D active vision systems. However, current projector models or structured light calibration techniques for 3-D active vision systems are limited to stripe-type structured light and the majority of them do not consider projector lens distortion. In order to overcome these limitations, a digital projector calibration method is developed to calibrate light beams projected from all pixel elements of a digital projector. Since the digital projector is fully programmable, various structured light patterns can be projected for coordinate acquisition, whose models can be obtained by interpolating parameters of light beams that synthesize the structured light patterns. With proper interpolation functions, experimental results indicate that the projector lens distortion can be successfully compensated and measurement errors are significantly reduced. When the digital projector is moved, a simple rigid body transformation calibration method is developed to rapidly obtain the transformation without re-calibrating the projector. The precision of the 3-D active vision system using the proposed digital projector calibration method and rigid body transformation calibration technique is experimentally evaluated.

Projector Calibration Method Based on Projective Transformation for Structured Light Measurement System

2012 ◽  
Vol 39 (10) ◽  
pp. 1008004
Author(s):  
高治华 Gao Zhihua ◽  
王昭 Wang Zhao ◽  
黄军辉 Huang Junhui ◽  
高建民 Gao Jianmin
Keyword(s):  
Measurement System ◽  
Projective Transformation ◽  
Structured Light ◽  
Calibration Method ◽  
Projector Calibration ◽  
Light Measurement

A Method of Line Structured Light Vision System Calibration Based on Stereo Vision

2013 ◽  
Vol 397-400 ◽  
pp. 1453-1458 ◽  
Author(s):  
Yu Bao Liu ◽  
Bin Liu ◽  
Jun Yi Lin
Keyword(s):  
Stereo Vision ◽  
Vision System ◽  
Structured Light ◽  
Calibration Method ◽  
Calibration Procedure ◽  
Control Points ◽  
Binocular Stereo Vision ◽  
Projector Calibration ◽  
Binocular Stereo ◽  
Structured Light Vision

It is a difficult task to get enough numbers of highly accurate control points for projector calibration in line structured light vision system. A new projector calibration method based on binocular stereo vision is proposed in this paper. Two cameras calibration can be done usingtraditional camera calibration method and they composed a binocular stereo vision. In projector calibration procedure, a planar template was located at several different positions in front of the stereo vision system. Two cameras captured the stripe images in each position simultaneously. Every center points of the laser stripe can be used as control points of the projector plane. The 3D coordinate of the stripe center points can be obtained through binocular stereo vision principle easily. So the light plane can be calculated quickly. Experiments were carried out and the result shows that the proposed method is flexible and stable.

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