基于智能手机的无人机低空倾斜摄影测量系统及其应用研究
毕卫华, 赵星涛, 杨化超, 卞和方, 张秋昭

Research on smartphone based UAV low-altitude oblique photogrammetry system and its applications
BI Weihua, ZHAO Xingtao, YANG Huachao, BIAN Hefang, ZHANG Qiuzhao
图2 使用ND镜前后影像效果对比
Fig.2 Image results before and after adding ND filter