自动化学报2004，Vol.30Issue(3)：442-448,7.
抗裁剪的DWT域CDMA扩频图像水印
DWT-Based CDMA Watermarking Resist Cropping
摘要
Abstract
This paper proposes a discrete wavelet transform (DWT)-based image watermarking algorithm using direct sequence code division multiple access (DS-CDMA) techniques, to resist cropping attack. The CDMA encoded watermark bits, concatenated by the synchronization code,are embedded into the selected DWT coefficients of the original image. During the blind recovery of the embedded data, the corresponding DWT coefficients of the cropped watermarked image are relocated by self-synchronizing efficiently, and then the correlation between the extracted watermark information and Gold sequence is analyzed. By exploiting the time-frequency localization characteristics of DWT, the computation load to search the synchronization code is reduced. The experiment results demonstrate that the generated watermark is robust to cropping, joint picture expert group (JPEG) compression, Gaussian noise and other common attacks.关键词
图像水印/CDMA/DWT/自同步/抗裁剪Key words
Image watermarking/CDMA/DWT/self-synchronization/cropping-resistant分类
信息技术与安全科学引用本文复制引用
方艳梅,吴绍权,黄继武..抗裁剪的DWT域CDMA扩频图像水印[J].自动化学报,2004,30(3):442-448,7.基金项目
Supported by National Natural Science Foundation of P. R. China (89975011, 60172067, 60133020, 60325208),“863” Program (2002AA144060), Funding of China National Education Ministry, Natural Science Foundation of Guangdong Province (013164) （89975011, 60172067, 60133020, 60325208）
