三维相机检校场标志点图像坐标提取方法

相机检校是摄影测量重要的工作环节之一,相机检校方法和结果直接影响摄影测量后处理的效率和精度。文中针对相机标定工作中存在的标志点人工提取效率低等问题,提出一种三维相机检校场圆形标志点图像坐标提取的方法,通过对原始图像进行高斯滤波、Canny边缘检测、椭圆形轮廓提取和拟合等一系列处理后,最终得到标志点中心的图像坐标。通过与人工量测标志点图像坐标的方法进行对比分析,验证方法的可行性,实现数码相机的快速标定。

A method of image coordinates extraction for mark points in 3D camera calibration network

The calibration of the camera is one of the important procedures for the photogrammetry .And the methods and the results of the camera calibration directly affect the after‐processing efficiency and precision of the photogrammetry .In order to solve the problems of low efficiency in the work of artificial extraction ,the paper proposes an automatic extraction method of three‐dimensional camera calibration field .T he image coordinates of the round mark points’ center are obtained by Gauss filtering ,Canny edge detection ,contour extraction and fitting ellipse column for the original images .The feasibility of the extraction method proposed is verified by comparing the method of artificial measurement of mark points’ image coordinates ,w hich can make the fast calibration of the digital camera .