一种光学镜头摄像机图象几何畸变的修正方法

由于光学镜头会产生几何畸变，并且摄像机成象平面与景物平面间存在着倾角和转角，因而光学镜头摄像机获取的图象存在着非线性的几何畸变，在对图象进行检测和定量分析之前，应消除这些畸变。为此，应用多项式变形技术和双线性插值方法，研究了一种摄像机拍摄图象几何畸变的修正方法，并讨论了控制点的选取方法。实验结果表明，应用三次多项式变形技术，选取少量控制点即可得到理想的校正结果。该方法简便实用，可用于固定条件下摄像

A Geometric Rectification Method for Lens Camera

Images with severe geometrical distortions,which are induced by camera lens and position, must be corrected before extracting quantitative m easurements.In this paper,we present a geometric calibration method for lens c amera by applying polynomial warping and bilinear interpolation,and discusses t he selection pattern of control points.First,we implement a general polynomial warping algorithm and a bilinear interpolation algorithm in Visual C 5 0,then we demonstrate that,for common optical lens,images with geometric dist ortions can be rectified with cubic polynomial warping method using only a few c ontrol points.This method is simple and practical,and can be used in camera-f ixed situations,such as operating table and on-line industry inspection,to ac quire lossless images.Practical application in lottery printing quality inspect ion shows that the method is reliable and valid.