基于离散余弦-广义小波变换的数字水印技术

Digital Watermarking Based on a Discrete Cosine-generalization Wavelet Transform

提出了兼备离散余弦变换和小波变换两者优点的离散余弦-广义小波变换和分层嵌入数字水印的概念与方法,该变换具有较强的数据压缩能力和嵌入水印的能力。用MATLAB语言在512×512Lena图像中分两层嵌入了图片及随机码,通过实验证明了该数字水印具有较好的隐蔽性和抵抗常见攻击的鲁棒性,也证明了为适应网络传输进行分层嵌入水印的可行性。

Two things are presented , one is discrete cosine-generalized wavelet transform which has both virtues of DCT and DWT, the other is the conception and methods of embedding layer-buih digital watermarks. The transform possesses very strong ability of data compression and embedding watermarks. With the programming tool-MATLAB, it is to be embedded two watermarks in 512512 Lena image, one is random series, the other is an image. The experimental result demonstrates that the embedded watermarks by the new scheme are invisible and robust against many common attacks, and the feasibility of embedding watermarks in different layers adapted to network transmission.