The common self-polar triangle of concentric circles and its application to camera calibration

2015 ◽  
Author(s):  
Haifei Huang ◽  
Hui Zhang ◽  
Yiu-ming Cheung
Keyword(s):  
Camera Calibration ◽  
The Common ◽  
Concentric Circles

The location and identification of concentric circles in automatic camera calibration

2013 ◽  
Vol 54 ◽  
pp. 185-190 ◽  
Author(s):  
Xinyu Chen ◽  
Ying Hu ◽  
Zi Ma ◽  
Shuanghe Yu ◽  
Yuqing Chen
Keyword(s):  
Camera Calibration ◽  
Concentric Circles ◽  
Automatic Camera Calibration

Enhanced Camera Calibration for Machine Vision using OpenCV

2014 ◽  
Vol 3 (3) ◽  
pp. 136 ◽  
Author(s):  
Shubham Rohan Asthana
Keyword(s):  
Machine Vision ◽  
Camera Calibration ◽  
Calibration Procedure ◽  
Robot Hand ◽  
Grid Pattern ◽  
World Model ◽  
Hand Eye Coordination ◽  
Concentric Circles ◽  
Calibration Techniques ◽  
Good Calibration

In several machine vision applications, a fundamental step is to precisely determine the relation between the image of the object and its physical dimension by performing a calibration process. The aim is to devise an enhanced mechanism for camera calibration in order to improve the already existing methods in OpenCV. A good calibration is important when we need to reconstruct a world model or interact with the world as in case of robot, hand-eye coordination. In order to meet the rising demands for higher accuracy various calibration techniques have been developed but they are unable in obtaining precise results. In this paper we propose an enhanced camera calibration procedure using a special grid pattern of concentric circles with special markers. The overall objective is to minimize the re-projection for good camera calibration.

scholarly journals Common self-polar triangle of separate circles for light field camera calibration

2021 ◽  
Vol 39 (3) ◽  
pp. 521-528
Author(s):  
Qi Zhang ◽  
Qing Wang
Keyword(s):  
Camera Calibration ◽  
Light Field ◽  
Linear Optimization ◽  
Real Data ◽  
Calibration Method ◽  
Calibration Algorithm ◽  
Calibration Pattern ◽  
The Common ◽  
Projection Center ◽  
Planar Homography

Due to the trade-off between spatial resolution and angular resolution of the light field, it is difficult to extract high precision corner points and line features from light fields for calibration. A novel calibration pattern of separate circles is designed, and a light field camera calibration method based on common self-polar triangle with respect to separate circles is proposed in this paper. First, we explore the uniquity and reconstruction of common self-polar triangle with respect to sperate circles. Then, based on projections of the multi-projection-center model on the plane and conic, the common self-polar triangle on the sub-aperture image is reconstructed and used to estimate planar homography. Finally, a light field camera calibration algorithm is then proposed, including linear initialization and non-linear optimization. Experimental results on both synthetic and real data have verified the effectiveness and robustness of the method and algorithm proposed.

Using concentric circles and wedge grating for camera calibration

2012 ◽  
Vol 51 (17) ◽  
pp. 3811 ◽  
Author(s):  
Junpeng Xue ◽  
Xianyu Su ◽  
Liqun Xiang ◽  
Wenjing Chen
Keyword(s):  
Camera Calibration ◽  
Concentric Circles
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