摘要
分析当前基于DCT变换的半脆弱水印算法,针对DCT变换后的系数,采用一种更简单的量化方法:直接用一参数对要嵌入的地方进行量化,其他非嵌入区保持系数不变。通过大量实验证明,该方法对一定程度的JPEG压缩具有好的鲁棒性,对滤波、噪声以及恶意剪切等攻击有好的脆弱性,为实际应用提供了好的思路。
This paper analyses some semi - fragile image watermarking algorithms based on DCT transformation, puts forward a more convenient method to quantization coefficients after DCT transformation. In the places where embed watermarking information, we use a parameter to quantization coefficients directly, while other places will not be modified. Through lots of experiments, it shows that the algorithm has great robustness under some degree JPEG compression. On the other hand, it＇ s fragile to other attacks such as filter, noising, cutting and replacing.
出处
《长沙民政职业技术学院学报》
2007年第1期114-116,共3页
Journal of Changsha Social Work College
关键词
DCT变换
半脆弱水印
量化
DCT transformation
semi -fragile image watermarking
quantization
