空间域图像安全水印方案的设计

S. S. Bedi, S. Verma
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引用次数: 10

摘要

数字水印(DWM)技术被提出用于实现数字版权管理(DRM)系统,可以用于建立所有权、确保授权访问和内容认证。本文的目标是保护数字静止图像的版权和内容认证,同时考虑对上下文到空间域的不可见水印内容的变化具有高水平的鲁棒性。该方案结合了密码学概念的优点和数字图像水印的不可感知特性。水印首先使用用户密钥进行哈希函数生成。这个新生成的水印的每一个比特然后被编码成原始图像的4倍4像素的各自块,以光栅扫描顺序。通过在给定块的对比度值指定的范围内修改每个块的像素强度的平均值来执行编码。这减少了人眼感知到的修改的影响。实验结果表明,该方法对常见的图像处理操作具有较好的鲁棒性。结果还表明,在提取的水印中,修改的位置是相应的误差
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Design of Secure Watermarking Scheme for Images in Spatial Domain
Digital watermarking (DWM) technology has been proposed for the implementation of digital right management (DRM) system that can be used for establishing ownership right, ensuring authorized access and content authentication. The goal of this paper is to protect copyrights and content authentication of digital still images with the consideration of high level of robustness against changes made to invisible watermark contents in context to spatial domain. The proposed scheme combines the advantages of cryptographic concept and imperceptibility feature of digital image watermarking. The watermark is first generated based on hash function with the use of user key. Each bit of this new generated watermark is then encoded into respective blocks of 4times4 pixels of the original image, in raster scan order. The encoding is performed by modifying the average value of pixel intensity of each block with in a range specified by the contrast value for a given block. This reduces the effects of the modification as perceived by the human eyes. The experimental results show the robustness of scheme against common image processing operations. The results also demonstrate the location of modification as corresponding error in the extracted watermark
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