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Measurement of the Cam Spacing on Camshaft by Binocular Vision

Yueqian Hou, Qingchang Tan, Qinghua Li, Yumei Song, Guannan Li
2016 International Journal of Multimedia and Ubiquitous Engineering  
This paper proposed a measurement method of the cam spacing of camshaft based on binocular vision. Firstly, internal and external parameters of the camera were calibrated by the improved calibration.  ...  Using the results of calibration, a method of measuring cam spacing of camshaft is presented. In the experiment condition, cam spacing of camshaft is measured.  ...  Calibration of Effective Focal Length The calibration of CCD camera can be divided to the calculating of interior camera parameters and exterior camera parameters, which directly affect the accuracy of  ... 
doi:10.14257/ijmue.2016.11.9.15 fatcat:te4jcc73ljeybaxrmqkvj3wgua

Extrinsic Parameters Calibration Method of Cameras with Non-Overlapping Fields of View in Airborne Remote Sensing

Lei Yin, Xiangjun Wang, Yubo Ni, Kai Zhou, Jilong Zhang
2018 Remote Sensing  
The measurement precision of these systems depends on the accuracy of the extrinsic parameters.  ...  First, the extrinsic parameters of any two cameras in a multi-camera system is calibrated, and the extrinsic matrix is optimized by the re-projection error.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs10081298 fatcat:xgi7kcizyvf3tlv74nspvxn66u

Optical See-Through Head Mounted Display Direct Linear Transformation Calibration Robustness in the Presence of User Alignment Noise

Magnus Axholt, Martin Skoglund, Stephen D. Peterson, Matthew D. Cooper, Thomas B. Schön, Fredrik Gustafsson, Anders Ynnerman, Stephen R. Ellis
2010 Proceedings of the Human Factors and Ergonomics Society Annual Meeting  
Also the LM step was excluded, thereby solely studying the effect of human noise on a standard DLT camera calibration.  ...  To reduce the effect of noise in "time-consuming and error-prone human measurements" Gilson et al.  ... 
doi:10.1177/154193121005402814 fatcat:raciit7aerhrrbwifo5fkeozpe

A Convenient Calibration Method for LRF-Camera Combination Systems Based on a Checkerboard

Zhuang Zhang, Rujin Zhao, Enhai Liu, Kun Yan, Yuebo Ma
2019 Sensors  
In this paper, a simple and easy high-precision calibration method is proposed for the LRF-camera combined measurement system which is widely used at present.  ...  Finally, the calibration accuracy and characteristics of the method are analyzed through simulation experiments, and the validity of the method is verified through the calibration of a real system.  ...  Acknowledgments: Thanks to the accompaniers working with us in department of the Institute of Optics and Electronics, Chinese Academy of Sciences.  ... 
doi:10.3390/s19061315 fatcat:gqdi5wmt4bdy5dmm2a3rygqa2a

Camera Sensor Model for Visual SLAM

Jing Wu, Hong Zhang
2007 Fourth Canadian Conference on Computer and Robot Vision (CRV '07)  
By iteratively placing the pattern at different distances from the camera, we can find a relationship between the measurement noise covariance matrix and the range.  ...  Our sensor model can potentially benefit visual SLAM algorithms by varying its measurement noise covariance matrix with range.  ...  Acknowledgments The authors would like to thank Xiang Wang and Jon Klippenstein for their discussions and insightful comments.  ... 
doi:10.1109/crv.2007.14 dblp:conf/crv/WuZ07 fatcat:bsv6wclxqra4fo6agsrqqm5wdm

A simplified two-view geometry based external calibration method for omnidirectional and PTZ camera pairs

Yalin Bastanlar
2016 Pattern Recognition Letters  
The external calibration of a camera system is essential for most of the applications that involve an omnidirectional and a pan-tilt-zoom (PTZ) camera.  ...  We propose an external calibration method that is effective and practical.  ...  Acknowledgments This work was supported by the TUBITAK Project 113E107.  ... 
doi:10.1016/j.patrec.2015.11.013 fatcat:7llfmi2uozhzfhh6v6beptjqpm

Self-Calibration Supported Robust Projective Structure-from-Motion [article]

Rui Gong, Danda Pani Paudel, Ajad Chhatkuli, Luc Van Gool
2020 arXiv   pre-print
Typical Structure-from-Motion (SfM) pipelines rely on finding correspondences across images, recovering the projective structure of the observed scene and upgrading it to a metric frame using camera self-calibration  ...  Together with theoretical reasoning why the self-calibration constraints are necessary, we show experimental results demonstrating robust multiview matching and accurate camera calibration by exploiting  ...  The dimension of the synthetic measurement matrix for exploring the effect of the outlier rate and the noise extent is fixed as 30×200 without zero columns or rows.  ... 
arXiv:2007.02045v1 fatcat:pbqi7not4fefrcipwfiumxtj74

Constrained Multiple Planar Reconstruction for Automatic Camera Calibration of Intelligent Vehicles

Sang Jun Lee, Jeawoo Lee, Wonju Lee, Cheolhun Jang
2021 Sensors  
Experiments were conducted in synthetic simulation and real calibration environments to demonstrate the effectiveness of the proposed method.  ...  However, conventional calibration methods, which solve a Perspective-n-Point problem, require laborious work to measure the positions of 3D points in the world coordinate.  ...  Conflicts of Interest: The authors declare no conflict of interest. Sensors 2021, 21, 4643  ... 
doi:10.3390/s21144643 fatcat:w63mxb6zqjdcjps3dzwmvc4abu

Research on Camera Self-Calibration of High-Precision in Binocular Vision

Zetao Jiang, Lianggang Jia, Shutao Guo
2012 Procedia Engineering  
By using the principle of the same name point lights Intersect at one point to get external camera parameters that dual camera relative position and attitude.  ...  Finally, by introducing the principles of camera non-linear distortion of regional adjustment to improve the accuracy of calibration.  ...  Acknowledgment This paper is sponsored by Nature Science Foundation of China (60973096) and Science Foundation of aviation in China (2010ZC56007).  ... 
doi:10.1016/j.proeng.2012.01.627 fatcat:b5qf4hax3zcvzhrlskfuegzf4y

Position and orientation measurement adopting camera calibrated by projection geometry of Plücker matrices of three-dimensional lines

Guan Xu, Anqi Zheng, Xiaotao Li, Jian Su
2017 Scientific Reports  
A position and orientation measurement method is investigated by adopting a camera calibrated by the projection geometry of the skew-symmetric Plücker matrices of 3D lines.  ...  The transform matrix is generated from the projections of the 3D lines.  ...  The two methods achieve higher measurement accuracy in the small measurement distance. Furthermore, three levels of Gaussian noises are added to study the effects of the noises.  ... 
doi:10.1038/srep44092 pmid:28266636 pmcid:PMC5339795 fatcat:t4dn6ybpbvg3tcwo2pu4p5jcuu

Estimation of camera calibration uncertainty using LIDAR data

Agustin Ortega, Ricardo Galego, Ricardo Ferreira, Alexandre Bernardino, Jose Gaspar, Juan Andrade-Cetto
2013 2013 European Conference on Mobile Robots  
This paper presents an analysis of uncertainty in the calibration of a network of cameras.  ...  Once the projection matrix is computed for each camera, error sources are propagated to compute estimates of each camera position uncertainty.  ...  The uncertainty of the camera projection center is one indicator of the precision of the calibration that can be computed using concise expressions.  ... 
doi:10.1109/ecmr.2013.6698868 dblp:conf/ecmr/JimenezGFBGA13 fatcat:rdg7gjdjtjc3ngny4h73l7cj7i

Novel Calibration Method for the Multi-Camera Measurement System

Xinlei Wang
2014 Journal of the Optical Society of Korea  
In a multi-camera measurement system, the determination of the external parameters is one of the vital tasks, referred to as the calibration of the system.  ...  Furthermore, this calibration method also can be used for auto-calibration of the multi-camera measurement system as the feature of parallels exists widely.  ...  One simple but typical kind of multi-camera measurement system is the stereo measurement system, which consists of two cameras with a common field of view.  ... 
doi:10.3807/josk.2014.18.6.746 fatcat:tzouswlh35av5h5cpzcbuuxfiu

Continuous-Time Spatiotemporal Calibration of a Rolling Shutter Camera—IMU System [article]

Jianzhu Huai, Yuan Zhuang, Qicheng Yuan, Yukai Lin
2021 arXiv   pre-print
This work takes the camera-IMU system as an example and looks into the RS effect on its spatiotemporal calibration.  ...  Unlike in calibrating GS cameras, every observation of a landmark on the target has a unique camera pose fitted by continuous-time B-splines.  ...  The gyroscope measurement ω m is corrupted by systematic errors encoded in a 3 × 3 matrix M g and the g-sensitivity effect encoded in a 3 × 3 matrix M s , b g , and ν g , ω m = M g ω I W I + M s a I s  ... 
arXiv:2108.07200v1 fatcat:vxgxiisibnen3fx73tojwih2dq

Calibration of Camera and Flash LiDAR System with a Triangular Pyramid Target

Zean Bu, Changku Sun, Peng Wang, Hang Dong
2021 Applied Sciences  
One capture of camera and LiDAR is sufficient for calibration, and errors are reduced by minimizing the distance between points and planes.  ...  Furthermore, the accuracy can be increased by more captures. We carried out experiments on simulated data with varying degrees of noise and numbers of frames.  ...  Performance with Respect to Noise on Point CloudThe errors of depth data during LiDAR measurement and corner points during camera measurement are primary error sources in the extrinsic calibration process  ... 
doi:10.3390/app11020582 fatcat:tk344mo3rjh6jiwfnlknisrh6q

Uncertainty Analysis of Camera Parameters Computed with a 3D Pattern [chapter]

Carlos Ricolfe-Viala, Antonio-José Sánchez-Salmerón
2005 Lecture Notes in Computer Science  
With the residual error of the index minimization an interval can be computed in which camera parameter is. This interval can be used as a measurement of accuracy of the calibration process.  ...  Depending on the accuracy of the computed camera parameter, the precision of the position of the image feature in the 3D scene vary.  ...  Acknowledgement This work was financially supported by the Spanish government (CICYT project number DPI2004-08353-C03-02), European Community FEDER funds and European Community research funds (Project  ... 
doi:10.1007/11553595_25 fatcat:2ivu226rera2dccax634xbu5bq
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