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Privacy Preservation with Data Hiding |
All visual privacy protection schemes modify video to conceal privacy information. In video surveillance, there is a need to authenticate such modification process and the privacy information needs to be preserved as potential evidence. We address these two goals by using secure data hiding to embed privacy information as "invisible" watermarks in the video. In the video below, the top left is the original surveillance video. The private object is extracted on the top right and the modified video is shown in the bottom left. The private object is then compressed, encrypted and embedded into the compressed domain of the host video, shown in the bottom right. The main technical challenge is to embed a large amount of information without significantly distorting the host video and raising the bitrate. To tackle this challenge, we are currently developing new perceptual distortion models and optimal embedding schemes. To learn more, check out our publications. |
