Jan Hendrik Hosang Rodrigo Benenson Bernt Schiele 6469-6477 2017 CVPR https://doi.org/10.1109/CVPR.2017.685 https://doi.ieeecomputersociety.org/10.1109/CVPR.2017.685 conf/cvpr/2017 db/conf/cvpr/cvpr2017.html#sangBS17