摘要
在高精度轴类零件尺寸图像检测中,提出了一种基于标准件法对镜头径向畸变进行快速校正的方法。该方法通过建立世界坐标转换到摄像机坐标、然后再转换到图像坐标的理想数学模型,并引入径向畸变参数,最终确立物体在世界坐标中与图像坐标中的映射关系,从而建立误差补偿曲线的高次拟合函数。利用得到的误差补偿函数的系数矩阵和径向畸变参数,实现镜头畸变的误差校正,有效改善了镜头畸变造成的检测误差。实验表明,该方法快速有效,提高了检测精度、降低了设备成本、检测精度可达2μm。
For the image detection of high-precision axial parts size,this paper proposes a method for the camera＇s radial distortion of rapid correction which is based on the standard method.We establish an ideal mathematical model which makes the world coordinate transform to the camera coordinate,and then switch to the image coordinates.Besides,we bring in radial distortion parameters,and finally establish an object which describes the relationship of the world coordinate with the image coordinate,so as to establish high time fitting error function for the error compensation curve.By using the coefficient matrix of error compensation function and radial distortion parameters,we realize the error correction of Lens distortion and improve the lens distortion caused by the detection error effectively.Experimental results show that this method can effectively improve the measuring accuracy and reduce the equipment cost with an accuracy of inspection up to 2 μm.
出处
《电子科技》
2013年第8期126-129,共4页
Electronic Science and Technology
基金
广东省教育部产学研结合基金资助项目(2010B090400382)
关键词
图像尺寸检测
高精度
镜头径向畸变
畸变校正
high-precision
image detection
camera＇s radial distortion
error correction of Lens distortion
