基于PDF417和提升小波的数字图像水印算法

根据PDF417与提升小波变换的特点，提出一种基于PDF417和提升小波变换的数字图像水印算法。首先将水印信息进行PDF417编码，并在密钥控制下进行混沌序列置乱后得到二值水印图像；最后使用小波提升技术对原始图像进行小波三级变换，在小波变换域低频子带中嵌入二值水印图像。实验结果证明：该算法能很好地保持图像质量，对常见的图像处理具有很强的鲁棒性，同时不仅能保持传统小波多分辨率图像水印的优势，而且处理速度更快，对图像尺寸没有特殊要求。

Digital image watermark algorithm based on PDF417 and lifting wavelet

According to the characteristics of PDF417 and the lifting wavelet transform,a digital image watermark algorithm based on PDF417 and lifting wavelet is proposed in this paper.Firstly,it can be obtained 2-value watermark image by PDF417 coding to watermark information and chaotic sequence scrambling.Finally,the 3-level DWT is applied to originality image using wavelet lifting technology,and the 2-value watermark image is embedded into the sub-band of wavelet transform domain.The experimental results show that this algorithm can keeps the quality image well and robust enough to the common image processing,it not only can keep the advantages of the traditional wavelet multi-resolution image watermarking,but faster processing speed and no particular requirements for image size.