一种新的基于小波变换的数字图象水印技术

提出了一种新的图象数字水印技术：首先通过Hilbert分形曲线扫描将二维图象转换成一维信号，再对此一维信号作小波变换，分解为多个尺度。选择中等尺度（中频带）分段重复嵌入数字水印，以保证其不可见性和稳健性。该技术简单、快速有效。实验表明，数字水印对JPEG压缩、高斯噪声、图象剪切和尺度变化等有很好的稳健性。

A Novel DWT-based Digital Watermarking in Images

In this paper,a novel wavelet-based digital watermarking technique is presented.first ,an image is converted into a 1-D signal by using Hillbert fractal curve.Using DWT,then,the multiresolution decomposition of the 1-D signal is obtained.finally, the watermarking is embedded into the individual parts of medium frequency coefficients to gurantee its imperception and robust.Our technique is simple,fast,and efficient.the experiment results demonstrate that the watermarking is robust to several signal processing techniques including JPEG compression,Gaussian noise,cropping,and scaling process,etc.