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《Optics and Precision Engineering》 2009-12
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Auto-focusing adjustment of theodolites by largest the gradient method

LIANG Min-hua1,2,WU Zhi-yong1, CHEN Tao1(1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130022,China;2.Graduate University of Chinese Academy of Sciences, Beijing 10039,China)  
An auto-focusing method used for the accurate auto-focusing of theodolites is proposed based on the largest gray gradient method.By making use the CMOS as an image sensor, and a computer for data processing, the system can adjust the camera's lens position to realize auto focusing by controlling a driving circuit. Firstly, the least focusing range including a principal object is controlled by the window selection, which not only reduces the load for data processing, but also reduces the influence of complex background on the accurate focusing and enhances the precision of auto-focusing.Then the edge gradients in all possible directions are calculated, and all of the possible edge gradients are campared to choose the largest gradient as the criterion of auto-focusing system. The experimental result demonstrates that the system can be characterized by its good unbiased characteristics, strong single peak features, high sensitivity and good stability, and the measuring precision of the system meets the requirements of the first focus-depth of the theodolite,for it has the focusing resolutions of 0.01-0.02 m.
【Fund】: 国家863高技术研究发展计划资助项目(No.2006AA703104)
【CateGory Index】: TP391.41
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