论文标题
使用动态强度因子基于强大小波的水印
Robust Wavelet-Based Watermarking Using Dynamic Strength Factor
论文作者
论文摘要
在无抵押的网络环境中，对数字内容（例如图像）的所有权保护正变得越来越关注。已经提出了不同的水印方法来解决数字材料的版权保护。水印方法受到了不可识别和鲁棒性的冲突参数的挑战。嵌入高强度因子的水印会增加鲁棒性，但也降低了水印的不可识别性。因此，嵌入在视觉上较差的区域中，即复杂的图像块可以满足这两个要求。本文提出了一种新的基于小波的水印技术，该技术使用自适应强度因子在水印透明度和鲁棒性之间进行权衡。我们测量每个图像块的变化，以适应一个强度因子，以将水印嵌入该块中。另一方面，解码器使用选定的系数通过投票算法安全提取水印。与最近的攻击方法相比，提出的方法在PSNR和BER方面显示了更好的结果，例如中值过滤器，高斯滤波器和JPEG压缩。
In unsecured network environments, ownership protection of digital contents, such as images, is becoming a growing concern. Different watermarking methods have been proposed to address the copyright protection of digital materials. Watermarking methods are challenged with conflicting parameters of imperceptibility and robustness. While embedding a watermark with a high strength factor increases robustness, it also decreases imperceptibility of the watermark. Thus embedding in visually less sensitive regions, i.e., complex image blocks could satisfy both requirements. This paper presents a new wavelet-based watermarking technique using an adaptive strength factor to tradeoff between watermark transparency and robustness. We measure variations of each image block to adaptively set a strength-factor for embedding the watermark in that block. On the other hand, the decoder uses the selected coefficients to safely extract the watermark through a voting algorithm. The proposed method shows better results in terms of PSNR and BER in comparison to recent methods for attacks, such as Median Filter, Gaussian Filter, and JPEG compression.
