基于同心圆求取图像畸变中心的简便方法

为了校正计算机视觉系统中由透镜引起的图像畸变，必须求解出图像的畸变中心。该文提出一种基于同心圆模式确定图像畸变中心的方法。该方法垂直拍摄不同位置的同心圆，根据相应畸变圆的形心确定出不同的直线，对这些直线求交点即得出畸变中心位置。不需要特殊实验设备，避免了复杂的非线性优化过程。对某摄像装置摄取的图像进行了实验，结果表明该方法简单可靠，精度能够满足一般工业要求。

Concentric Circles-based Simple Method to Solve Image Distortion Center

The distortion center must be solved in order to correct the image distortion resulting from the lens in computer vision system. A concentric circles-based method is proposed in the paper to find the distortion center. In the method, the concentric circles in different positions are captured perpendicularly, and then the centroids of distorted concentric circles in corresponding image are computed to determine the straight lines. The intersection point of such different lines is solved as the distortion center. The method needs no special equipments and avoids complex nonlinear optimization procedure. An experiment is performed and the presented method proves to be simple and reliable. Its accuracy can meet the common industrial requirement.