DWT-DCT-SVD域的水印置乱新研究

Digital watermarking research based on DWT-DCT-SVD

为了更好的保护数字产品的版权问题,充分利用了离散小波变换(DWT)、离散余弦变换(DCT)和奇异值分解(SVD)的特征优势,提出了混合域的水印算法。对原始图像进行一级小波离散变换,并对低频子带进行离散余弦变换和奇异值分解。将水印图像进行Arnold变换和伪魔方变换保证安全性,然后再经过离散余弦变换和奇异值分解,最后将水印嵌入到处理过的原始图像奇异值中。实验表明,该方法具有较好的鲁棒性和不可见性,而且能够抵抗常见攻击。

To protect copyrights of digital products effectively,in this paper,an algorithm for digital watermarking based on discrete wavelet transforms( DWT),discrete cosine transforms( DCT) and singular value decomposition( SVD) has been proposed. In the embedding process,the host image is decomposed into first level DWTs. Low frequency band( LL) is transformed by DCT and SVD. The watermark image is firstly transformed by Arnold and pseudo magic square,and then transformed by DCT and SVD. The S vector of watermark information is embedded in the S component of the host image. The experimental based on this algorithm demonstrates that the watermark has good robustness and invisibility which can resist normal attacks.