Abstract: For improving the transparency of embedding watermark into 3D mesh model, an adaptive watermark intensity adjusting algorithm based on local geometric features of mesh model is proposed. Mesh model is partitioned into some local area first, and embedding intensity is adjusted according to fluctuation of local geometric features. Evaluation of geometric error and evaluation of visual distortion are both adapted to test the performance of the algorithm. Experimental results show that, compared with the non-adaptive technique, the proposed adaptive technique can improve transparency of watermark effectively both in object evaluation and in subject evaluation.

Key words: mesh model watermark, transparency, watermark intensity, adaptive embedding, sample variance, local area

摘要： 为提高三维网格模型嵌入水印的透明性，提出一种基于模型局部几何特征的自适应水印强度调节算法。将网格模型分割为若干局部区域，根据各区域内几何数据的波动情况对水印嵌入强度进行调节。几何误差和视觉失真误差评价结果表明，与非自适应嵌入方法相比，该方法嵌入的水印透明性较高。

关键词: 网格模型水印, 透明性, 水印强度, 自适应嵌入, 样本方差, 局部区域

CLC Number: 

• TP309