【作者】 李明建；

【导师】 赖惠成；

【作者基本信息】 新疆大学 ， 通信与信息系统， 2008， 硕士

【摘要】 数字水印作为一种将特殊信息嵌入媒体数据的技术,近年来已成为国内外研究的热点,并有着广泛的应用前景。通常数字水印应用于数字图像、音频、视频以及其他媒体产品中以进行版权保护和验证多媒体数据的完整性。针对数字水印研究的基础——数字图像水印技术,研究者提出了各种不同的算法。目前通用的做法是将水印嵌入到图像的小波变换域,并结合人类视觉系统特性来优化算法。通过对数字水印理论的广泛研究,本文提出了一种基于编码和二维条形码的数字水印算法。采用二维条形码作为水印信息,通过编码和按特殊顺序排列实现对水印信息的预处理。水印嵌入策略上,采用离散小波变换,结合人眼视觉特性将水印嵌入到载体图像小波变换的低频域。Matlab7.1的仿真结果表明该算法具有较好的鲁棒性和不可见性。本文的研究课题的创新点在于:1.通过对二维条形码图像矩阵的编码实现对水印图像的置乱,其优点是算法简单,处理速度快,易于实现。2.通过对置乱后的图像矩阵的特殊排列,提高嵌入水印图像的内在关联性,使该算法对剪切等几何攻击的鲁棒性增强。3.本文实现了固定阈值的水印检测,克服了一些水印算法检测阈值不固定,需要通过反复实验来确定的弊端。更多还原

【Abstract】 Digital watermarking, the technology of embedding special information into multimedia data, is a topic that has gained increasing attention all over the world recently. In general, the watermark of digital image, audio, video, and other media products has been proposed for resolving copyright ownership and verifying the integrity of content.On the digital image watermarking technology which is the basis of digital watermarking, the researchers propose a variety of algorithms. At present general practice is to embed watermarks into the images’wavelet transform domain, and to combine characteristics of human vision system to optimize the algorithm.Based on the widely study of the theory of digital watermarking, we introduce an algorithm of digital watermarking based on encoding and 2D barcode in this paper. We use the 2D barcode as the watermarking information and realize the pro-process of the watermarking information through encoding and forming it according to the specific arrangement. On the watermarking strategy, we use discrete wavelet transform, combining the human eye visual characteristic; embed the watermarking in the low frequency domain of the cover image’s DWT result. Matlab7.1 artificial experiment indicates that this method has a better robustness and invisibility.The innovative contributions are presented as follows:1.Realize disorder of watermarking image through encoding the 2D barcode image’matrix. The merits of this method are simple, having a good speed, easy to realize.2.Improve the internal relevancy of the watermarking image through arranging the disorder image’matrix according to the specific order. So this algorithm has good robustness to cut etc. geometry attacks.3.In this paper, we realize fixed threshold watermarking detection , conquers the disadvantage that in some watermarking detection algorithms there are no fixed thresholds, and should make certain of them though repeat experiments.更多还原