Video surveillance is increasingly common but also raises privacy concerns. The document discusses several technologies that aim to preserve privacy while still allowing video surveillance to serve legitimate purposes. These include automatically masking or scrambling sensitive areas and objects in video feeds, encrypting entire videos, and using multiple keys to control access to different zones and time periods. Such smart video surveillance techniques could help address both security and privacy.

1. Video Surveillance preserving privacy Touradj Ebrahimi Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne, Switzerland [email_address]

4. World Trade Center, 9/11 Mohamed Atta filmed by a Gas Station surveillance camera on September 10, 2001 filmed by an ATM surveillance camera on September 10, 2001

5. Attack on London underground, July 7, 2005 On a reconnaissance mission two weeks before the attack

6. Plot to attack trains in Germany, August 2006 Two unexploded bombs found in luggage aboard two trains Both terrorists have been arrested thanks to the video footage

24. Smart video surveillance […011001…]

25. Automatic event detection

26. Video surveillance preserving privacy Masking MPEG-7 camera Invertible scrambling Invertible encryption

28. Scrambling Process

29. Unscrambling Process

31. Scrambling Level

32. Some illustrative examples Scrambler Unscrambler