基于鱼眼相机畸变图像的大尺寸目标测量方法

Large size target measurement method based on distorted image of fish eye camera

为满足大尺寸目标高精度图像测量的需求,提出一种利用鱼眼畸变图像实现宽视野、大几何尺寸目标测量方法。根据非线性畸变的多项式逼近函数建立鱼眼相机成像模型,通过立体标定板来确定相机参数;将相机沿光轴方向移动采集一组图像,建立鱼眼相机的测量模型实现待测目标尺寸的测量。通过对棋盘格和某大型建筑物几何尺寸的测量实验表明,本文提出的直接利用畸变图像进行测量的方法优于传统的将畸变图像校正成线性图像测量的方法,具有更高的测量精度和稳定性。

In order to meet the demand of high precision image measurement of large object, a method of measuring large size target with wide field of vision by using fish eye camera image distortion is proposed. According to the polynomial approximation function of nonlinear distortion, the camera imaging model is established, and the camera parameters are determined through the stereo calibration plate;Move the camera along the optical axis to collect two images, and establish a measurement model to measure the size of the target to be measured. Through the measurement experiments of checkerboard and the geometric dimensions of a large building, it is shown that the method of directly using the distorted image proposed in this paper is superior to the traditional method of correcting the distorted image into a linear image, and has higher measurement accuracy and stability.