本文首先介绍了2种主要透镜畸变及摄像机标定方法;然后结合摄像机内部参数和视频帧率推导出关键帧航向重叠度计算公式;在此基础上实现了指定航向重叠度关键帧从文件源或实时源中的自动提取,文件源中采用定位关键帧自动提取算法,实时源中采用定时自动提取算法;最后利用得到的标定参数完成关键帧影像矫正。实验结果表明本文采用的算法能够高效、准确地得到矫正好的指定航向重叠度关键帧。 In this paper, two main methods of lens distortion and camera calibration are introduced firstly. Then, the calculation formula of the heading overlap of the key frame is derived based on the internal parameters of the camera and the video frame rate. Based on this, Automatic extraction of source, the source of key file using automatic extraction algorithm, real-time source using automatic extraction algorithm; Finally, the use of the calibration parameters to complete the key frame image correction. Experimental results show that the proposed algorithm can efficiently and accurately obtain the key frames with the specified heading overlap.