【作者】 张娜； 黄华； 齐春；

【Author】 Zhang Na+, Huang Hua, Qi Chun School of Electronics and Information Engineering, Xi’an Jiaotong University, 710049, China

【机构】 西安交通大学电子与信息工程学院；

【摘要】 本文提出一种基于平衡多小波变换的自适应数字水印技术。根据平衡多小波的特征,得出平衡多小波变换低频域的一种视觉模型,并根据此模型得到其临界可见阈值(JND),由此可以根据原图特征来自适应地控制水印嵌入的强度,采用加性原则在平衡多小波低频区嵌入水印,水印提取不需要原图,而是根据JND来提取水印。实验表明,本文算法不仅具有较好的不可感知性,而且对于滤波、压缩、噪声具有较强的鲁棒性,对其他的裁减、缩放等几何攻击也具有一定的抗击性。更多还原

【Abstract】 In this paper, an adaptive watermarking algorithm based on balanced multiwavelets transform is proposed. According to the properties of balanced multiwavelets, a well established low frequency domain’s perceptual model is given; therefore, the strength of the embedded watermark is controlled by the local properties of the host image. The embedding scheme is based on addition principles in balanced multiwavelets’ low frequency domain, the watermark extraction can be performed without original image based on JND. Experimental results show that the watermarked images look visually identical to the original ones, and the watermarks can also be successfully survived after image processing operations such as image cropping, scaling, filtering and JPEG compression.更多还原