基于DWT的数字水印算法研究

数字水印是在不影响多媒体产品（如数字图像、文档、视频、音频等）使用质量的前提下，将具有特定意义的标记（水印），按照某种给定算法嵌入到媒体产品中，以实现对该产品的保护或认证。针对数字图像水印技术，比较系统地研究了基于DWT域的两种数字图像水印嵌入算法及对应的提取算法。实验结果表明，两种嵌入算法都有不错的效果；第一种算法对应的提取算法提取出的水印效果不很理想，第二种算法对应的提取算法提取出的水印效果较为理想。

Digital watermarking technology based on DWT

A digital watermarking technology means that imperceptibly embedding a specifically signal (the watermark) into multimedia data such as image,text,video and audio by a certain proposed algorithm in order to protect multimedia data and authentication.According to the digital image watermarking technology,two embedding algorithms based on DWT and corresponsive distilling algorithms are studied.The result of the experiment shows that two embedding algorithms are effective and the first distilling algorithm can achieve better fusion performance than the other one.