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来源：百度知道 编辑：UC知道 时间：2024/07/02 04:24:24
Digital watermarking technology is in the field of information security in recent years the rise of new methods to protect intellectual property rights
在实际的工作和生活中很多需要版权保护的重要资料，都是以数字图像水印的形式保存，因此针对数字图像水印技术的研究具有重要的应用价值。
典型的数字水印算法包括空间域水印算法和变换域水印算法两大类。其中空间域水印算法包括最低有效位算法（LSB）、patchwork算法等。此类算法的优点是对宿主图像影响小且嵌入信息量大；缺陷是对图像尺寸变换鲁棒性不强。变换域水印算法包括DCT、DFT、DWT变换等。此类算法的优点在于具有很好的隐蔽性和安全性，同时它还有很好的抗攻击能力；缺陷是嵌入信息量小且运算量大。
本文以灰度图像为研究对象，首先简要介绍了数字水印的概念、研究背景、发展趋势等，然后系统的叙述了数字水印的基本原理和主要算法，并结合变换域中的DFT变换对灰度图像进行了具体的研究，最后通过攻击检测了水印图像的鲁棒性并对实验结果做了总结和分析
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In the actual work and life, many of the important need to protect copyright information are based on digital image watermark in the form of preservation, digital image watermarking technology for the study has important value.
The typical digital watermarking algorithm including space domain watermarking algorithm and transform domain watermarking algorithm two categories. One space domain watermarking algorithm including the minimum-effective method (LSB), patchwork algorithm. Such algorithm has the advantage of the host image and impact on small embedded informative; defects transform the image size is not as robust. Transform domain watermarking algorithm including DCT, DFT, DWT transform, and so on. Such a method has the advantage of being very good concealment and security, it also very good at the same time the anti-attack capability; defect is embedded small amount of information and computing capacity.
In this paper, gray image for the study, first of all brie