Mosaic-based privacy-protection with reversible watermarking

Video surveillance has been applied to many fields, specifically for detecting suspicious activity in public places such as shopping malls. As the use of video-surveillance cameras increases, so too does the threat to individual privacy. Therefore, video-surveillance technologies that protect individual privacy must be implemented. In this study, we propose a scheme in an MPEG2 video-encoding environment that successfully employs mosaicking, encryption, and restoration of faces captured in videos.