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http://dx.doi.org/10.5302/J.ICROS.2004.10.8.673

Development of Displacement Measurement System of Structures Using Image Processing Techniques  

김성욱 (부경대학교 기계공학과)
김상봉 (부경대학교 기계공학)
서진호 (부경대학교 해양산업개발연구소)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.10, no.8, 2004 , pp. 673-679 More about this Journal
Abstract
In this paper, we develop the displacement measurement system of multiple moving objects based on image processing techniques. The image processing method adopts inertia moment theory for obtaining the centroid measurement of the targets and basic processing algorithm of gray, binary, closing, labeling and so on. To get precise displacement measurement in spite of multiple moving targets, a CGD camera with zoom is used and the position of camera is changed by a pan/tilt system. The fiducial marks on the fixed positions are used as the sensing points for the image processing to recognize the position errors in direction of XY-coordinates. The precise alignment device is pan/tilt of XY-type and the pan/tilt is controlled by DC servomotors which are driven by a microprocessor. Morover, the centers of fiducial marks are obtainted by an inertia moment method. By applying the developed precise position control system for multiple targets, the displacement of multiple moving targets are detected automatically and are also stored in the database system in a real time. By using database system and internet, the displacement datum can be confirmed at a great distance and analyzed. Finally, the effectiveness of developed system is shown in experimental results and realized the precision about 0.12[mm] in the position control of XY-coordinates.
Keywords
multiple objects; pan/tilt, image processing technique; CGD camera; displacement measurement;
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