and Jian Sun, “Faster R-CNN: Towards Real-Time Object Detection with Region Proposal Networks,” in NIPS 2015. • [Lin+ ICCV 2017] Tsung-Yi Lin, Priya Goyal, Ross Girshick, Kaiming He, and Piotr Dollár, “Focal Loss for Dense Object Detection,” in ICCV 2017. • [Tian+ ICCV 2019] Zhi Tian, Chunhua Shen, Hao Chen, and Tong He, “FCOS: Fully Convolutional One-Stage Object Detection,” in ICCV 2019. • [He+ ICCV 2017] Kaiming He, Georgia Gkioxari, Piotr Dollár, and Ross Girshick, “Mask R-CNN,” in ICCV 2017. • [Bolya+ ICCV 2019] Daniel Bolya, Chong Zhou, Fanyi Xiao, and Yong Jae Lee, “YOLACT: Real-time Instance Segmentation,” in ICCV 2019. • [Xie+ CVPR 2020] Enze Xie, Peize Sun, Xiaoge Song, Wenhai Wang, Ding Liang, Chunhua Shen, and Ping Luo, “PolarMask: Single Shot Instance Segmentation with Polar Representation,” in CVPR 2020. References