Holographic Blind Watermarking Algorithm of Three- Dimensional Mesh Model Based on QR Decomposition

This paper proposes a holographic blind watermarking algorithm of the three-dimensional mesh model based on QR decomposition. Firstly the three-dimensional model is pre-processed by moving the model center to the coordinate origin and doing PCA analysis. Secondly the model’s geometric feature matrix is constructed by using the distance from the three-dimensional mesh model vortex to the model center in the column coordinate system. Then the watermarking information generated by the holographic encrypted technology is embedded into the normalized and blocked model’s geometric feature matrix based on QR decomposition. Finally the watermark is embedded into three-dimensional mesh model via inverse QR decomposition and inverse normalization operation. The experimental results indicate that this algorithm can resist translation, rotation, scaling, vertex reordering, noise and cropping attack, which has good robustness. This method can effectively protect the three-dimensional mesh model intellectual property.