Mr. Hu Zhou Profile

Hu Zhou

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Publications (2)

Proceedings Article | 3 February 2009 Paper

Resolution improvement of the electronic theodolite in automatic guided laser theodolite system by subdivided locating method of image

Hu Zhou, Jigui Zhu, Zili Zhang, Shenghua Ye

Proceedings Volume 7160, 71602O (2009) https://doi.org/10.1117/12.807057

KEYWORDS: Laser systems engineering, Image processing, Image segmentation, Image resolution, Cameras, Imaging systems, Oxygen, Data modeling, Commercial off the shelf technology, CCD cameras

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Proceedings Article | 3 February 2009 Paper

The guidance methodology of a new automatic guided laser theodolite system

Zili Zhang, Jigui Zhu, Hu Zhou, Shenghua Ye

Proceedings Volume 7160, 71600R (2009) https://doi.org/10.1117/12.806991

KEYWORDS: Control systems, Cameras, Imaging systems, Image processing, Laser systems engineering, Automatic tracking, Calibration, Telescopes, Computing systems, Manufacturing

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Spatial coordinate measurement systems such as theodolites, laser trackers and total stations have wide application in manufacturing and certification processes. The traditional operation of theodolites is manual and time-consuming which does not meet the need of online industrial measurement, also laser trackers and total stations need reflective targets which can not realize noncontact and automatic measurement. A new automatic guided laser theodolite system is presented to achieve automatic and noncontact measurement with high precision and efficiency which is comprised of two sub-systems: the basic measurement system and the control and guidance system. The former system is formed by two laser motorized theodolites to accomplish the fundamental measurement tasks while the latter one consists of a camera and vision system unit mounted on a mechanical displacement unit to provide azimuth information of the measured points. The mechanical displacement unit can rotate horizontally and vertically to direct the camera to the desired orientation so that the camera can scan every measured point in the measuring field, then the azimuth of the corresponding point is calculated for the laser motorized theodolites to move accordingly to aim at it. In this paper the whole system composition and measuring principle are analyzed, and then the emphasis is laid on the guidance methodology for the laser points from the theodolites to move towards the measured points. The guidance process is implemented based on the coordinate transformation between the basic measurement system and the control and guidance system. With the view field angle of the vision system unit and the world coordinate of the control and guidance system through coordinate transformation, the azimuth information of the measurement area that the camera points at can be attained. The momentary horizontal and vertical changes of the mechanical displacement movement are also considered and calculated to provide real time azimuth information of the pointed measurement area by which the motorized theodolite will move accordingly. This methodology realizes the predetermined location of the laser points which is within the camera-pointed scope so that it accelerates the measuring process and implements the approximate guidance instead of manual operations. The simulation results show that the proposed method of automatic guidance is effective and feasible which provides good tracking performance of the predetermined location of laser points.

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