采用复合式靶标的近景大视场相机标定方法

发布时间：2018-07-18 20:38

【摘要】：针对风洞内视觉测量视场较大,测量物体较近以及图像畸变过大等导致的标定精度低,标定物成本高等问题,提出了一种基于复合式靶标分区域分约束近景大视场相机标定方法。该方法利用一维标定架与二维标定平面构造的复合式靶标充满测量视场将测量视场划分区域,针对不同参照物信息采用分约束的方式完成整个视场的分区域准确标定,重建时针对感兴趣特征所处图像不同区域选取不同像机内外参数与畸变系数进行3D重建,完成基于复合式靶标的三维信息求取。最后,针对所提出的标定方法进行了标定精度对比以及验证实验。实验结果表明:内区域标定均方根误差为0.165,外区域标定均方根误差为0.276,标定精度高,满足了测量精度要求。
[Abstract]:Aiming at the problems of low calibration precision and high cost of calibration due to the large field of view of visual measurement in wind tunnel, the proximity of measurement object and the excessive distortion of image, etc. In this paper, a calibration method based on compound target sub-region sub-constraint is proposed for close-range and large-field camera calibration. In this method, the measuring field of view is divided by the composite target filling measurement field constructed by the one-dimensional calibration frame and the two-dimensional calibration plane, and the accurate calibration of the whole field of view is accomplished by using the sub-constraint method for the information of different reference objects. In order to obtain 3D information based on composite target, 3D reconstruction is carried out by selecting different camera parameters and distortion coefficients for different regions of the image of interest feature. Finally, the calibration accuracy of the proposed calibration method is compared and verified. The experimental results show that the root-mean-square error is 0.165 in the inner region and 0.276 in the outer area. The calibration accuracy is high and the measurement accuracy is satisfied.
【作者单位】：大连理工大学机械工程学院;
【基金】：国家自然科学基金(51375075,5122704) 973计划项目(2014CB46504) 创新研究群体科学基金(51321004)
【分类号】：TP391.41

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