基于DCT和混沌信号的数字水印算法

DIGITAL IMAGE WATERMARKING ALGORITHM BASED ON DCT AND CHAOTIC SIGNALS

给出了一种图像数字水印算法 ,利用混沌系统产生的混沌信号作为数字水印信息 ,并在DCT变换域中有选择地嵌入水印 ,再经DCT逆变换得到水印图像。数值实验结果表明 ,该算法具有较强的透明性和鲁棒性 ,水印检测结果准确 ,对给定的几种图像处理攻击有抵抗性。由于混沌信号具有似噪声、宽频谱等特性 ,因此引入混沌信号 。

Recently the protection of digital information has received significant attention within the digital media community. In this paper, we present a digital watermarking algorithm based on DCT and chaotic signals, i.e., a chaoticsequence is embedded in a selected set of DCT coefficients. Numerical experiments show that the proposed algorithm is perceptually invisisble and the watermark can be detected correctly by exploiting the statistical properties of the embedded sequence. Moreover, the algorithm is robust to several image processing techniques, including noise adding, low pass and filtering. As chaotic signals possess random-like, wide spectrum nature, so it can greatly improve the security of the watermarking products.