Autonomous UAV forced graffiti detection and removal system based on machine learning. - Prakhar Nahar; Kang-hua Wu; Sitao Mei; Hadiyah Ghoghari; Preethi Srinivasan; Yueh-lin Lee; Jerry Gao 002; Xuan Guan (SmartWorld/SCALCOM/UIC/ATC/CBDCom/IOP/SCI, 2017)