图像特征里的小波域水印算法

Wavelet watermarking algorithm in characteristics region of image

提出一种基于图像特征区域的鲁棒水印算法。确定载体图像的关键点,利用轮廓跟踪工具勾出嵌入水印区域的轮廓,从而确定嵌入位置。对确定的图像区域做离散小波变换(DWT)。将由密钥产生的水印信息按照从大到小的顺序嵌入到低频变换域里,再做离散小波逆变换,将抽出的部分与含水印部分叠加,得到完整含水印图像。实验结果证明,算法既保证了载体图像的视觉质量,同时对于一般常见攻击也具有较好的鲁棒性。

A robust watermarking algorithm is proposed in feature region of digital image.The key points are identified in vector images,and contour tracking tool is used to outline the embedded watermark region and determine the embedding position.The determined region is transformed into DWT domain.The generated watermark by a key is embedded in the most important part of transform domain in accordance with the smallest order.The watermarked part is done by inverse discrete cosine transform,and overlaid with the cut out part,the watermarked carrier image is gotten.Experimental results show that the algorithm not only guarantees the quality of visual perception image carrier,it also has good robustness against the common attacks.