基于射影不变量的摄像机标定

为解决摄像机标定过程中自动寻找标定物平面上的特征点与图像平面上特征点的对应关系问题,将射影空间几何不变量性质应用到对应点的寻找过程中,通过交比不变性确定标定物和图像上的5个特征点的对应关系;再从5个特征点对中取出任意3个点对,确定标定物和图像上其他特征点的对应关系.实验结果证明:该方法标定准确,标定过程自动、快捷.

Camera calibration based on invariance of perspective projection

The paper attempts to find out corresponding relationship between the feature points on the flat of calibration reference object and on the plane of image automatically during camera calibration.The paper introduces the application of the invariant of perspective projection geometry in space into finding the corresponding points.The practice starts with finding out five feature points' corresponding on the object and on the image by cross ratio invariant and then taking out 3 pairs arbitrarily from the five feature corresponding points and finding out the other points' corresponding relationship between which on the flat of calibration object and on the plane of image.This method features simplicity,shortcut and nicety.Experiments show that the certificate's results present a higher precision and the camera calibration are self-motion and shortcut.