基于三维DLT方法的非量测数码相机检校

Non-Metric Digital Camera Calibration Based on 3D Direct Linear Transformation

低空无人机遥感系统应用日益广泛,其一般搭载传感器为非量测型数码相机,为了保证测量精度必须进行相机检校,以确定其内方位元素和畸变差系数。采用室外三维控制场的DLT(直接线性变换)方法,编制了基于三维DLT方法的非量测型相机的检校软件,该软件具备相机检校参数解算和物方空间坐标解算功能。对于室外三维控制场的测量数据和一海岛的无人机航摄数据,分别使用和不使用相机检校参数进行处理,试验结果显示使用检校参数可以获得更好地测量精度,表明了室外三维检校场方案和编制的相机检校软件是正确可行的,可实现非量测数码相机的检校。

The application of low-altitude UAV remote sensing system is rapidly increasing,and the sensor mounted on UAV is commonly a non-metric digital camera.To ensure the measurement accuracy,the camera must be calibrated in order to determine interior orientation elements and distortion coefficient.A set of software is developed for calibrating the non-metric digital camera based on the Direct Linear Transformation（DLT）used in the outdoor 3Dcalibration field.This software has the function of calculating camera calibration parameters and object space coordinates.We have tried to process the data measured in the outdoor 3Dcalibration field and the UAV aerial data of an island by and not by using the camera calibration parameters respectively.The results show that by using the calibration parameters better measurement accuracy can be obtained,indicating that this camera calibration software thus developed is correct and feasible and the calibration of non-metric digital camera is realizable.