一种基于四叉树分割的小波域自适应水印方案

文章提出了一种基于四叉树分割的小波域自适应水印方案。算法根据图像的纹理和细节通过四叉树分割将小波系数划分成大小不等的系数块,引入一个与系数块的性质有关的视觉加权因子,对小波域无损视觉量化模型进行了改进,提高了水印的嵌入强度;通过小波系数的量化选择,将水印信息嵌入到小波域的鲁棒性系数上,提高了水印对抗常规处理的能力。仿真实验结果证明该方案同时具有良好的鲁棒性和透明性。

A Adaptive Watermarking Scheme Based on Quadtree-Split in the Wavelet Domain

A adaptive watermarking scheme based on quadtree-split in the wavelet domain is proposed in this paper.Based on the quadtree-split of the wavelet coefficients,a visual parameter which is related to the block of the wavelet coefficients is confirmed with the different block of coefficients.It ensures the strenght of the watermarking is increased. The wavelet coefficients which quantized are not zero are choosed to insert watermarking. It is shown with experiments that the adaptive watermarking scheme both has the good transparency and robustness.