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散焦模糊量估计的相机加权标定方法 被引量:3
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作者 汪蕾 刘涛 +1 位作者 董琦聪 冯结青 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2020年第3期410-417,共8页
相机标定在计算机视觉领域中有着至关重要的作用.绝大多数相机标定方法假设相机为针孔模型,且需要良好聚焦的图像来保证相机内外参估计的准确性.然而,这些条件会受到相机景深的影响.在薄透镜相机模型假设下,提出了一种加权相机标定的方... 相机标定在计算机视觉领域中有着至关重要的作用.绝大多数相机标定方法假设相机为针孔模型,且需要良好聚焦的图像来保证相机内外参估计的准确性.然而,这些条件会受到相机景深的影响.在薄透镜相机模型假设下,提出了一种加权相机标定的方法,其权重考虑了控制点的模糊量信息.首先对棋盘格标定物上的每一个角点进行散焦模糊量估计,在标定过程中,将散焦模糊量的大小作为一个权重加入到标定能量函数最小化过程中,使得标定精度得到提高.该方法简单高效,不需要额外的数码设备或者特别定做的标定物.在Intel Core i7处理器的计算机下,使用合成数据以及真实数据上进行的实验结果表明,文中方法能够有效减小重投影误差,提高张正友标定方法的标定精度. 展开更多
关键词 加权相机标定 边界提取 散焦模糊 模糊估计
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Geo-location for Ground Target with Multiple Observations Using Unmanned Aerial Vehicle 被引量:1
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作者 Xu Cheng He Chenglong Huang Daqing 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2018年第5期829-837,共9页
In order to improve the target location accuracy of unmanned aerial vehicle(UAV),a novel target location method using multiple observations is proposed.Firstly,the camera intrinsic parameters are calibrated.Then,the w... In order to improve the target location accuracy of unmanned aerial vehicle(UAV),a novel target location method using multiple observations is proposed.Firstly,the camera intrinsic parameters are calibrated.Then,the weighted least squares estimation is used to improve the localization precision because the traditional crossover method is vulnerable to noise and has low precision.By repeatedly measuring the same target point,a nonlinear observation equation is established and then covered to linear equations using Taylor expansion.The weighted matrix is obtained according to the height of the measurement point and the camera optic axis pointing angle,and then the weighted least squares estimation is used to calculate the target position iteratively.Finally,the effectiveness and robustness of this method is verified by numerical simulation and flight test.The results show that this method can effectively improve the precision of target location. 展开更多
关键词 unmanned AERIAL vehicle TARGET LOCATION camera calibration weighted least SQUARES estimation
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