A Reversible Watermarking Scheme for 2D Vector Maps

摘要

Reversible watermarking is suitable for hiding data in 2D vector maps, because it can remove the embedding-induced distortions after extracting the hidden bits. This paper proposes a novel reversible watermarking scheme based on the difference shifting. Since the vector map includes a sequence of vertices, we embed the watermark into the vertex coordinates by modifying the differences between the adjacent vertex coordinates. The scheme need not record the extra information. The experimental results show that the proposed scheme achieves good performance of the imperceptibility and is robust against some attacks, such as slightly adding noise, translating, slight scaling and rotating.