基于深度图绘制3D图像的水印技术

Novel watermarking based on DIBR 3D image

由于基于深度图绘制的虚拟视点技术具有的独特优势,越来越多的3D产品版权保护问题受到极大的关注。不同于传统2D图像的水印技术,在基于深度图绘制的3D图像里,不仅需要通过嵌入水印来保护中间图像,而且需要保护左右眼虚拟图像。通过对中间图像进行3层小波变换后,利用奇偶量化方式来修改每个子分块的小波系数,实现了中间图像的水印信息嵌入。嵌入的水印可以从中间图像以及左右眼虚拟图像中提取出来。实验表明,所提水印算法对常见的信号失真攻击具有良好的顽健性。

Depth-image-based rendering（DIBR） has become an important technology in 3D displaying with its great advantages. As a result, more and more 3D products copyright problems turn out. Since either the center view with depth image or the synthesized virtual views could be illegally distributed, not only the center views but also the synthesized virtual views need to be protected. A watermarking method for DIBR 3D images was proposed. After applying three-level DWT to the center image, odd-even quantization was utilized to modify the coefficients of the sub-blocks of the center image, by this way the proposed method was made robust to typical signal distortions, such as JPEG compression, noise addition and median filter. As the experimental results shown, the proposed method is much more robust to the common signal distortion attacks with lower BER（bit error rate） compared with existing methods.