成像距离对图像畸变系数的影响研究

基于共线特征点求解图像畸变系数的方法,研究了拍摄物体平面与镜头平面间的不同距离参数对图像畸变系数的影响,并结合实验结果探寻了畸变系数的变化规律。在此基础上,指出镜头的畸变系数不仅与焦距有关,成像距离也是重要的影响因素,不可忽略。进行了不同距离参数下的畸变系数对相同标准量块图像校正的实验研究,比较了不同畸变系数下校正量块图像的不同高度位置的宽度曲线。实验结果表明,不同距离参数下的畸变参数对量块图像进行校正的结果是不同的,且当选用的畸变参数的距离与实际的成像距离相同时,其校正结果的精度最高,量块图像宽度测量的精度最高。

Study on the Influence Rule of Different Imaging Distance to Distortion Coefficients

Based on the approach to estimate the image distortion coefficients through a set of collinear pints,the influence of the distance between the object plane and the lens plane on the image distortion coefficients is studied. Combined with the experimental result,the change rule of the distortion coefficients is explored. Then,the influence of the distortion coefficients (under various distances between the object plane and the lens plane) on the correction of the same gauge block is experimentally researched. The experimental results show that the correction results of gauge block image are different under different parameters of distortion coefficients. Only when the chosen distance in the distortion parameters is the same as the real imaging distance,the correction precision is the highest,and the measured accuracy of the gauge is also the highest.