Paper Titles
Design and Implementation of Remote Lab with Industrial Robot Accessible through the Web
p.67
Using of Assembly Cell with SCARA Robot to Education of Teachers at Secondary Vocational Schools
p.74
Simulation of a Mechatronic Dual-Axis Tracking System for PV Panels
p.81
Building Energy Simulation with On-Site Weather Station
p.88
A Precise Algorithm for Known Spherical Marker Position Retrieval Using an Ideal Pinhole Camera in a Diffuse Light Scene
p.93
IMAQ Vision Builder Applications in SEM Image Processing of Pharmaceutical Powders
p.99
Some Considerations about SWIR Gated Camera Performance by Using SNR and Detection Probability Concepts
p.104
Modern and Sleek Web Technologies for Promoting Library Services and Resources
p.110
An H∞ Design Approach for a PID Automatic Flight Control System of a Launch Vehicle
p.116

A Precise Algorithm for Known Spherical Marker Position Retrieval Using an Ideal Pinhole Camera in a Diffuse Light Scene

Article Preview

Abstract:

The exact marker image was computed for various positions in the workspace and for each image was computed back the approximation of the marker position based on it. The position computation used the symmetry of the scene and the particular characteristics of the ellipse marker projection. Was established that the center of symmetry of the marker projection is different than the projection of the marker center itself and the the relation between two was found using the Dandeline Spheres. For a given marker radius the ratio between the area of the right cone base that contains the marker center projection and the area of the marker projection was expressed as a law based only on the angle of the line passing through the focal point and the symmetry center of the marker projection and the view axis. Based on all these intermediary results was obtained an algorithm with a precision under 0.04 mm in sagital plane, and under 0.1 mm on the depth view axis with a modest 1920x1680 camera resolution.

You might also be interested in these eBooks
Advanced Research in Area of Materials, Aerospace, Robotics and Modern Manufacturing Systems View Preview

Info:

Periodical:

Applied Mechanics and Materials (Volume 859)

Pages:

93-98

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.859.93

Citation:

Cite this paper

Online since:

December 2016

Authors:

Radu Mirescu*, Gabriela Roșca

Keywords:

Dandelin Spheres, Ideal Pinhole Camera, Spherical Marker Position Retrieval

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2017 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

* - Corresponding Author

References

[1] S. Shaid, T. Tumer, and C. Guler, Marker detection and trajectory generation algorithms for a multicamera based gait analysis system, Mechatronics (11) 2001, pp.409-437.

DOI: 10.1016/s0957-4158(00)00026-x

Google Scholar

[2] M.O. Heller, G. Bergmann, G. Deuretzbacher, L. Dürselen, M. Pohl, L. Claes, N.P. Haas, G.N. Duda, Musculo-skeletal loading conditions at the hip during walking and stair climbing,. Journal of Biomechanics. 34(7): pp.883-893, (2001).

DOI: 10.1016/s0021-9290(01)00039-2

Google Scholar

[3] R. Baker, Measuring Walking; A handbook of Clinical Gait Analysis, Mac Keith Press, (2013).

Google Scholar

[4] C. R. Mirescu, G. Roșca, Error Estimation for Known Marker Position Retrieval by Ideal Pinhole Camera Direct Observation, Applied Mechanics and Materials, Vol. 841, pp.192-197, 2016, doi: 10. 4028/www. scientific. net/AMM. 841. 192.

DOI: 10.4028/www.scientific.net/amm.841.192

Google Scholar

[5] C. R. Mirescu, G. Roșca, Estimate of Color Depth Discretization Impact on the Accuracy of an Ideal Pinhole Camera, Applied Mechanics and Materials, Vol. 811, pp.217-221, Nov. 2015; doi: 10. 4028/www. scientific. net/AMM. 811. 217.

DOI: 10.4028/www.scientific.net/amm.811.217

Google Scholar

[6] K-Y.K. Wong, D. Schnieders,S. Li, Recovering Light Directions and Camera Poses from a Single Sphere, 10th European Conference on Computer Vision, Part I, pp.631-642, (2008).

DOI: 10.1007/978-3-540-88682-2_48

Google Scholar

[7] Information on https: /en. wikipedia. org/wiki/Dandelin_spheres.

Google Scholar

[8] Information on http: /www. bobatkins. com/photography/technical/digitaldof. html.

Google Scholar

[9] F. J. Yu, X. Luan, D. L. Song, X. F. Li, H. H. Zhou, A Novel High Accuracy Sub-Pixel Corner Detection Algorithm for Camera Calibration, Applied Mechanics and Materials, Vols. 239-240, pp.713-716, (2013).

DOI: 10.4028/www.scientific.net/amm.239-240.713

Google Scholar