Critical Points Extraction from Building Façades by Analyzing Gradient Structure Tensor Chen, Dong ; Li, Jing ; Di, Shaoning ; Peethambaran, Jiju ; Xiang, Guiqiu ; Wan, Lincheng ; Li, Xianghong Abstract Publication: Remote Sensing Pub Date: August 2021 DOI: 10.3390/rs13163146 Bibcode: 2021RemS...13.3146C