摘要
根据零水印的概念,提出了一种基于混沌变换和小波变换相结合的水印生成算法。该方法不对原始图像作任何修改,在对原始水印混沌加密以后,利用小波变换低频系数特征实现水印的嵌入。试验证明,该方法解决了水印不可见性和鲁棒性之间的矛盾,具有很强的抗攻击能力。
According to the conception of zero - watermarking, this paper proposed a zero - watermarking algorithm based on chaotic sequences and wavelet transform. The method realized embedding watermark by obtaining the extracted watermark image through the encrypted watermark and low - frequency sub - image after wavelet transform. Experimental result shows that the method is more robustness and improves transparency and security.
出处
《测绘与空间地理信息》
2010年第1期156-160,共5页
Geomatics & Spatial Information Technology
关键词
零水印
小波变换
混沌变换
二值化
zero - watermark
DWT
chaotic sequences
binaryzation
