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Hidden in plain sight: A spatial-domain watermark for grayscale images.

机译:隐藏在清晰视野中:灰度图像的空间域水印。

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摘要

Watermarking techniques consider multimedia data as a communication channel transmitting covert information for a variety of purposes. One widely used technique is the Least Significant Bit (LSB) substitution in the spatial domain, in which an ordinary message, or a watermark, can be imperceptibly inserted in some innocuous looking digital image. A classical LSB scheme makes it computationally simple and easy to hide a large amount of data within a host image. However, such a scheme is fragile in a competitive environment such as the Internet, where adversaries have an incentive to obliterate the embedded watermark. In addition, tradeoffs exist between the capacity, invisibility and robustness of the secret watermark. The possibility of using the intrinsic nature of cover images is explored in this thesis, and a new LSB-based watermarking approach to grayscale images is developed. The proposed method offers better performance in terms of the three attributes through an image-adapting coding. The effectiveness of the method is verified through analysis. The experimental results show that the proposed method improves the robustness of hidden watermarks without compromising their invisibility and capacity.
机译:水印技术出于各种目的将多媒体数据视为传输秘密信息的通信信道。一种广泛使用的技术是空间域中的最低有效位(LSB)替换,在该替换中,可以将普通消息或水印潜移默化地插入看起来无害的数字图像中。经典的LSB方案使计算简单易行,可以在主机映像中隐藏大量数据。但是,这种方案在竞争环境(如Internet)中非常脆弱,在这种环境中,攻击者有动机消除嵌入的水印。另外,在秘密水印的容量,隐形性和鲁棒性之间存在折衷。本文探讨了利用封面图像的内在性质的可能性,并开发了一种基于LSB的灰度图像水印新方法。所提出的方法通过图像自适应编码在三个属性方面提供了更好的性能。通过分析验证了该方法的有效性。实验结果表明,该方法提高了隐藏水印的鲁棒性,且不影响其不可见性和容量。

著录项

  • 作者

    Zhang, Yue.;

  • 作者单位

    University of Guelph (Canada).;

  • 授予单位 University of Guelph (Canada).;
  • 学科 Computer Science.
  • 学位 M.Sc.
  • 年度 2005
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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