Mr. Kaip Kai Profile

Kaip Kai

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Proceedings Article | 6 November 2006 Paper

The study of dual camera 3D coordinate vision measurement system using a special probe

Shugui Liu, Kai Peng, Xuefei Zhang, Haifeng Zhang, Fengshan Huang

Proceedings Volume 6357, 63574H (2006) https://doi.org/10.1117/12.717330

KEYWORDS: Cameras, Imaging systems, CCD cameras, 3D metrology, 3D vision, CCD image sensors, Distance measurement, Light sources, Calibration, Computing systems

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Due to high precision and convenient operation, the vision coordinate measurement machine with one probe has become the research focus in visual industry. In general such a visual system can be setup conveniently with just one CCD camera and probe. However, the price of the system will surge up too high to accept while the top performance hardware, such as CCD camera, image captured card and etc, have to be applied in the system to obtain the high axis-oriented measurement precision. In this paper, a new dual CCD camera vision coordinate measurement system based on redundancy principle is proposed to achieve high precision by moderate price. Since two CCD cameras are placed with the angle of camera axis like about 90 degrees to build the system, two sub-systems can be built by each CCD camera and the probe. With the help of the probe the inner and outer parameters of camera are first calibrated, the system by use of redundancy technique is set up now. When axis-oriented error is eliminated within the two sub-systems, which is so large and always exits in the single camera system, the high precision measurement is obtained by the system. The result of experiment compared to that from CMM shows that the system proposed is more excellent in stableness and precision with the uncertainty beyond ±0.1 mm in xyz orient within the distance of 2m using two common CCD cameras.

Proceedings Article | 10 February 2005 Paper

The modeling of portable 3D vision coordinate measuring system

Shugui Liu, Fengshan Huang, Kai Peng

Proceedings Volume 5638, (2005) https://doi.org/10.1117/12.575929

KEYWORDS: Mathematical modeling, CCD cameras, Systems modeling, Distance measurement, Imaging systems, Light sources, Light emitting diodes, 3D vision, 3D modeling, Computing systems

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The portable three-dimensional vision coordinate measuring system, which consists of a light pen, a CCD camera and a laptop computer, can be widely applied in most coordinate measuring fields especially on the industrial spots. On the light pen there are at least three point-shaped light sources (LEDs) acting as the measured control characteristic points and a touch trigger probe with a spherical stylus which is used to contact the point to be measured. The most important character of this system is that three light sources and the probe stylus are aligned in one line with known positions. In building and studying this measuring system, how to construct the system’s mathematical model is the most key problem called perspective of three-collinear-points problem, which is a particular case of perspective of three-points problem (P3P). On the basis of P3P and spatial analytical geometry theory, the system’s mathematical model is established in this paper. What’s more, it is verified that perspective of three-collinear-points problem has a unique solution. And the analytical equations of the measured point’s coordinates are derived by using the system’s mathematical model and the restrict condition that three light sources and the probe stylus are aligned in one line. Finally, the effectiveness of the mathematical model is confirmed by experiments.

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