Abstract: The instrumental errors of an analytical plotter derive mainly from the stage of the analytical plotter, so the stage calibration is a very important quality index for evaluating the measurement accuracy of the analytical plotter. With the help of CCD images, realization of high-precision positioning and measurement has become the basic standard for machine vision and real time photogrammetry systems. The software system, which employs some image processing algorithms for the automatic stage calibration with the CCD camera, based on the analytical plotter which SOKKIA researched and developed, is discussed. The reliability and validity are also discussed. !6
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