  Nowadays, three-dimensional meshes have been extensively used in several
applications such as, industrial, medical, computer-aided design (CAD) and
entertainment due to the processing capability improvement of computers and the
development of the network infrastructure. Unfortunately, like digital images
and videos, 3-D meshes can be easily modified, duplicated and redistributed by
unauthorized users. Digital watermarking came up while trying to solve this
problem. In this paper, we propose a blind robust watermarking scheme for
three-dimensional semiregular meshes for Copyright protection. The watermark is
embedded by modifying the norm of the wavelet coefficient vectors associated
with the lowest resolution level using the edge normal norms as synchronizing
primitives. The experimental results show that in comparison with alternative
3-D mesh watermarking approaches, the proposed method can resist to a wide
range of common attacks, such as similarity transformations including
translation, rotation, uniform scaling and their combination, noise addition,
Laplacian smoothing, quantization, while preserving high imperceptibility.
