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基于小波域子带特征编码的鲁棒水印技术
引用本文:孙秋冬,颜文英,高顺富,郁海华.基于小波域子带特征编码的鲁棒水印技术[J].上海第二工业大学学报,2009,26(1):39-43.
作者姓名:孙秋冬  颜文英  高顺富  郁海华
作者单位:上海第二工业大学电子与电气工程学院,上海,201209
基金项目:上海市教育委员会重点学科,上海市教育委员会科学发展基金 
摘    要:为了提高数字水印的透明性和鲁棒性,建立了一个视觉模型计算不同图像块水印嵌入的临界噪声阈值(JND),并选择块离散小波变换(DWT)的三个细节子带作为水印嵌入对象。算法先对文本水印和水印图像进行二值化、冗余编码和随机置乱,得到二值水印序列;然后在宿主图像分块的Hilbert扫描序列中,每次选取两相邻分块分别进行DWT变换,并利用JND和二值水印编码,来调整两相邻分块各对应细节子带均值之间的大小关系;最后,进行离散小波逆变换,以实现水印的嵌入。实验证明,被该算法所嵌入的水印具有很好的不可见性,且该算法对常见图像攻击具有较好的鲁棒性。故该算法是有效和实用的。

关 键 词:人类视觉系统  Hilbert扫描  分块小波变换  子带特征编码  数字水印

Robust Watermarking Technique Based On Sub-band Encoding in Block DWT Domain
SUN Qiu-dong,YAN Wen-ying,GAO Shun-fu,YU Hai-hua.Robust Watermarking Technique Based On Sub-band Encoding in Block DWT Domain[J].Journal of Shanghai Second Polytechnic University,2009,26(1):39-43.
Authors:SUN Qiu-dong  YAN Wen-ying  GAO Shun-fu  YU Hai-hua
Affiliation:School of Electronic and Electrical Engineering;Shanghai Second Polytechnic University;Shanghai 201209;P.R.China
Abstract:For improving the transparency and robustness of digital watermarking,a human visual model was created to calculate the block based just noticed difference(JND),and the three sub-bands of block discrete wavelet transform(DWT) were selected for embedding objects.Firstly,binarized from a text file or black-white image,a watermark sequence was encoded by redundant encoding and scrambled randomly.Then,two neighboring blocks were selected each time from the Hilbert scanning sequence of the host image blocks,and ...
Keywords:human visual system  Hilbert scanning  block wavelet transform  sub-band feature encoding  digital watermarking  
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