A DCT-based dual watermarking algorithm for three-dimensional mesh models

Robust digital watermarking of three-dimensional models is a effective means to copyright protection, which was studied in recent years, this paper proposed a DCT-based dual watermarking algorithm for Three-Dimensional mesh models, Semi-fragile watermark signal 1 was used to model tampering detection and localization, which was transformed the angel between vectors(from center of gravity to each vertex) and Z Axis; Fingerprint was selected in this paper as the robustness watermark signal 2, which identified author´s copyright information. The experimental results showed that the watermarking algorithm can resist all sorts of geometry attack, cutting, and noise, moreover, it has a better watermark transparency.