A COMPARATIVE STUDY OF DIFFERENT MODES OF PERTURBATION FOR VIDEO WATERMARKING BASED ON MOTION VECTORS (ThuAmPO3)

Author(s) : Yann Bodo (France Telecom R&D, FRANCE) Nathalie Laurent (France Telecom R&D, FRANCE) Jean-Luc Dugelay (EURECOM, FRANCE)

Abstract : In this paper, we study the robustness of different grid types used for the embedding rules described in a previous work. In this algorithm, we embed a mark in the uncompressed domain by disturbing slightly the motion vectors computed by an exhaustive BMA on blocks of size N*N. The embedding rule is based on a reference grid that allows to slightly displace the marked vectors in a neighborhood of there original marked position whitout missing the watermarking information. The grid tested are a square, a circular and an angular one. To increase the robustness, we embed the mark by generating a hierarchy of motion vectors to spread the mark on the lower level associated to block N*N with N=k*n.

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