基于光栅投影测量改进的类双目系统标定方法

发布时间：2019-05-14 08:49

【摘要】：系统标定是光栅投影测量系统中的关键一步。将投影仪看成相机的类双目系统标定方法具有操作简单、精度高、可靠性强的优势。在此系统标定方法的基础上,提出一种提高测量系统精度的系统标定方法。根据提取的标定板上圆标识的圆心坐标,利用计算机生成含有相对应十字标识的图像,用于相机标定,可避免圆标识轮廓对角点提取的影响,从而提高相机标定精度。同时,推导快速求取投影仪伽马的表达式用于相位校正,可建立投影仪像素与相机像素精确的对应关系,从而提高投影仪标定精度。结合投影仪和相机的标定结果,建立统一的世界坐标系完成整体系统的标定。实验结果表明:采用上述标定方法,可将投影仪和相机标定精度分别达到0.25 pixel和0.15 pixel;同时测量了一个长方体,精度达到0.142 7 mm。
[Abstract]:System calibration is a key step in grating projection measurement system. The calibration method of the projector as a camera binocular system has the advantages of simple operation, high precision and strong reliability. On the basis of this system calibration method, a system calibration method to improve the accuracy of the measurement system is proposed. According to the center coordinate of circle mark on the extracted calibration board, the image with corresponding cross mark is generated by computer, which can be used in camera calibration, which can avoid the influence of circle mark outline on corner extraction, and thus improve the calibration accuracy of camera. At the same time, the expression of projector gamma is deduced quickly for phase correction, and the accurate corresponding relationship between projector pixel and camera pixel can be established, so as to improve the calibration accuracy of projector. Combined with the calibration results of projector and camera, a unified world coordinate system is established to calibrate the whole system. The experimental results show that by using the above calibration method, the calibration accuracy of projector and camera can reach 0.25 pixel and 0.15 pixel;, respectively, and a cuboid can be measured at the same time, and the accuracy can reach 0.142 7 mm..
【作者单位】：河北工业大学机器人及自动化研究所;中国民航大学天津市民用航空器适航与维修重点实验室;
【基金】：国家自然基金委员会与中国民用航空局联合资助(U1433117) 中国民航科技重大专项(MHRD20130104) 中国民航大学天津市民用航空器适航与维修重点实验室开放基金
【分类号】：TP391.41

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