【作者】 白帆；

【导师】 褚宝增；

【作者基本信息】 中国地质大学（北京） ， 应用数学， 2010， 硕士

【摘要】 随着多媒体技术和计算机网络的迅速发展,越来越多的数字信息产品通过网络广泛传播。在这一背景下,数字水印作为图像的内容认证中的应用主要手段,正得到广泛研究与应用,本论文以数字图像为研究对象,本文提出了一种对图像的剪切操作具有较好检测能力同时对中等强度JPEG压缩和图像处理具有较高鲁棒性的半易损水印方案。应用于区域地质图中。此方案利用8×8图像分块的直流系数生成二值水印序列W,对W采用Baker映射进行置乱得到最终水印Wb,然后将其嵌入到载体图像中。通过比较直接解出的兰乱水印和经Baker映射反变换后的解出水印,完成水印的嵌入之后对它的抗攻击性进行检测,提出了如何确定篡改的区域和篡改的类型是半易损水印的方法。实验结果表明,该算法具有好的鲁棒性和识别被篡改的区域能力。更多还原

【Abstract】 With the multimedia technology and the rapid development of computer networks, more and more digital information products widely disseminated over the network. Brought in to facilitate the same time, which caused the illegal copying and malicious tampering, and other violations have also attracted attention. Against this backdrop, the official digital watermarking technology was born. Now, as a digital watermark image of the contents of the certification application of the main tools are widely research and application. This paper to digital images for the study, this paper presents a picture of the shear operation with better detection capability at the same time on the strength of middle-JPEG compression and image processing with high robustness of the semi-fragile watermarking program.This program uses 8×8 block images of the DC coefficient to generate binary sequence watermark W, on the adoption of W mapping Baker has been scrambling for the final watermark Wb, and then embedded vector images. By comparing the direct solution of a blue watermark chaos and anti-Baker mapping out solutions transformed watermark, the watermark is embedded after the completion of its aggressive anti-testing, raised the question of how to identify tampering with the regional and tampering with the type of semi-fragile Watermark. The results show that the algorithm is good and robust identification has been tampered with the region’s capacity.更多还原