摘要
提出的数字水印算法将图像小波变换理论和分块技术相结合,在小波域的最低层逼近系数分块矩阵中,采用重复嵌入技术自适应地嵌入水印。水印提取时,采用两种提取方案,不仅可以完全抵御剪切攻击,而且可以定位载体图像所遭受的攻击,且提取水印时不需要原始载体图像,而现有水印系统的提取方案是唯一的。该算法易于实现,具有较好的实用价值。
By studying the wavelet transform and the blocked technology, a digital watermark algorithin is proposed, the watermark image is adaptive embedded into the blocked lowest approximation components of wavelet domain on repeat embedding technology. Watermark extraction use two methods and blind detection while only one extraetion method is used. This algorithm can distinguish various cropping attack and completely against them. The method is implemented easily, test results show that the algorithm is valid.
出处
《计算机技术与发展》
2008年第12期150-152,共3页
Computer Technology and Development
基金
2008年度安徽省高等学校省级自然科学研究项目(KJ2008B090)
