摘要
介绍了将数字水印技术引入到金融信息安全领域的原因,分析了小波变换与人类视觉模型在处理图像时的相似性.在此基础上提出了一种基于人类视觉模型的小波多分辨分析图像数字水印算法,该算法具有很好的不可见性及鲁棒性.该算法借用数字签名思想,用Hash函数生成与图像子块内容有关的图像摘要,并以加密方式产生数字水印.该水印是根据图像子块内容自适应生成的,图像子块内容如果有了显著变化,就会在水印中表现出来.在检测时不需要原始图像,属于盲水印.实验结果表明该算法用于鉴定图像真伪是行之有效的.
The reason for introducing the technique of digital watermarking into the domain of financial information security was presented. The similiariy between wavelet transformation and HVS(Human Visual Ssytem) in processing an image was analyzed. A new digital image watermarking method based on HVS and wavelet transformation was produced, thus it is visible and robust. The idea of digital ideograph of an abstract of the image related to sub-block was made with the function of Hash, and a digital watermarking encrypted, which can show whether the sub-block changes or not. The original image isn′t needed in detecting watermarking. The results showed that this method is effective to authenticate an image.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第6期4-7,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
