以数字近景摄影测量中相机内参数为研究对象,分析了相机成像模型和镜头畸变模型,使用基于平面标定物的方法对内参数进行了校准。根据数字近景摄影系统的特点和用途,设计和制作了具有多种特征的标定板,给出了相机内参数校准的步骤。对角点检测函数做了算法上的分析,编写了适合标定板的角点检测函数。用该方法对数字近景摄影相机的内参数进行了校准试验,角点检测的平均误差＜0.02 pixel。

The camera intrinsic parameters in digital close-range photogrammetry were studied.The imaging and distortion model were analyzed.Then,the camera intrinsic parameters were calibrated with the method based on plate pattern.A multi-feature plate pattern was designed according to the application and the characteristics of the system.Furthermore,a corner detection function suit for the plate pattern was coded after analyzing the detecting algorithm. At last,an experiment was carried out to examine the plate pattern and the detection function.The average error in corner detecting was less than 0.02 pixel in this examination.