Robust digital watermarking in videos based on geometric transformations

In the efforts to fight piracy of high-valued media content, forensic digital watermarking as a passive content security scheme is a potential alternative to current, restrictive approaches like DRM. In this paper, we present a novel watermarking scheme for videos based on affine geometric transformations. Frames can be modified in an imperceptible manner by applying a small, global rotation, translation, or zooming, which can be detected later on by comparison with the originals. To compensate geometric distortions that have been introduced while a video travels down legal as well as illegal distribution chains, a spatio-temporal synchronization is performed using our video registration toolkit application. To evaluate our approach, we compare it with several other schemes regarding the robustness against common attacks, including camcorder capture.

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