【摘要】 随着计算机多媒体技术的快速发展,如何保护数字产品不被复制、盗用、篡改已成为信息安全领域中亟待解决的问题,数字水印技术成为解决该问题的一种新方法。本文基于三维离散余弦变换(3D-DCT)技术和DCT双极性系数量化技术提出三维体数据模型的鲁棒盲提取数字水印嵌入算法,该算法嵌入的水印信息具有不可见性。采用向MRI体数据模型嵌入二值图像水印信息的方法,对算法进行了仿真,结果表明算法实现了盲提取,且能够抵抗剪切、加噪、低通滤波等常见攻击。更多还原

【Abstract】 With the rapid development of computer multimedia, how to protect digital products from being copied, pirated and juggled has been an urgent problem in the information security field. Digital watermarking is a new method to solve the referred problems. This paper proposes a robust blind watermarking algorithm for volume data based on three-dimension discrete cosine transform (3D-DCT) and bi-polar quantizing technique of DCT coefficients. The embedded watermark is invisible. The experiment is used to the algorithm with embedding binary image to MRI data. The experiment results show the algorithm is blind and withstands the common attacks such as cropping, adding noise and filtering.更多还原