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为使水印攻击方法具备自我证明的特性,满足某些有特殊要求的版权保护需求,该文在分析数字图像离散余弦变换(DCT)域自适应水印嵌入原理的基础上,提出了一种水印攻击方法。该方法利用人类视觉系统(HVS)特性选择隐蔽载体(Stego-image)相应的水印嵌入区域,在载体的质量改变不被感知的情况下,利用矩阵变换的周期性理论,对选择的区域进行周期性变换(攻击)。试验结果表明,新的攻击方法在保证视觉质量要求的前提下能很有效地阻止数字水印的检测和提取,具有较好的攻击效果;同时经过多次相同变换(攻击)后,可以完全重构Stego-image,从而可向版权所有者提供攻击成功的证明。
In order to make the watermark attack method self-proving and satisfy some copyright protection requirements with special requirements, this paper proposes a watermarking attack based on the principle of adaptive watermark embedding in DCT (Digital Image Discrete Cosine Transform) method. This method uses the human visual system (HVS) characteristics to select the corresponding watermark embedding region of the stego-image. When the quality of the carrier is not perceived, periodicity theory of matrix transformation is used to select the region Sex transformation (attack). The experimental results show that the new attack method can effectively prevent the digital watermark detection and extraction under the premise of ensuring visual quality, and has a good attack effect. At the same time, after multiple identical transformations (attacks), the new attack method can be fully reconstructed Stego-image, which provides the copyright owner with a proof of attack.