Smart video surveillance system preserving privacy
Fréderic Dufaux, Touradj Ebrahimi · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2005
In this paper, we present a smart video surveillance system based on standard technologies and wired or wireless IP networking. The camera is performing the following operations. First, a video analysis module detects suspicious events and identifies regions of interest in the scene. The video is then compressed using JPEG 2000. The resulting compressed stream is signed and scrambled for the purpose of data integrity verification and confidentiality. Finally, the stream is protected for robustness to transmission errors based. The system is designed in such a way to protect the privacy of people under surveillance. More specifically, during the analysis stage, people in the scene are detected by change detection or face detection techniques. Scrambling is then applied only to the corresponding regions. Furthermore, the amount of distortion can be controlled by restricting scrambling to some resolution levels or quality layers. In this way, people under surveillance cannot be recognized, but the remaining of the scene is clear. The encryption key is kept under control of judicial authorities, who can grant authorization to unlock the protection and view the whole scene. Per consequent, this system successfully addresses the loss of privacy issue.