?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Zhu%2C+Qiuchen&rft.aulast=Zhu&rft.aufirst=Qiuchen&rft.date=5+December+2018&rft.title=Crack+Detection+Using+Enhanced+Thresholding+on+UAV+based+Collected+Images&rft.genre=proceeding