PT Unknown AU Birnstill, P Pretschner, A TI Enforcing privacy through usage-controlled video surveillance SE 2013 10th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS) : Krakow, Poland ; 27 - 30 Aug. 2013 PY 2013 BP 318 EP 323 DI 10.1109/AVSS.2013.6636659 LA english ER