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《Infrared and Laser Engineering》 2011-01
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New method of camera calibration based on checkerboard

Niu Haitao,Zhao Xunjie(School of Physical Science and Technology,Soochow University,Suzhou 215006,China)  
On the basis of analyzing Opencv camera distortion model and the existing calibration method of binocular vision system,a new calibration algorithm consisting of three stages was proposed.Firstly,the center coordinates of the image plane were estimated by least square algorithm.Selecting the area near the image center as the initial space of camera calibration,the internal and external parameters except for distortion parameters were estimated by linear optimization without regard to the distortion.Secondly,the obtained parameters were set as initial values to solve distortion parameters with linear optimization.Finally,the parameters estimated in the front two stages were improved iteratively through a nonlinear optimization,to make all the parameters globalization.The experimental results indicate that the algorithm can get more precise calibration parameters,which meets the requirements of binocular three-dimensional reconstruction and other application.
【Fund】: 江苏省高校自然科学基金资助项目(06kja14003)
【CateGory Index】: TP391.41
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