多重虚拟三维物体菲涅耳全息水印方法  

Method on Fresnel Holographic Watermark of Multiple Virtual Three-Dimensional Objects

作　　者：陈家祯[1] 郑子华[1] 叶锋[1] 连桂仁[1] 许力[1] 

机构地区：[1]福建师范大学数学与计算机学院,福州350007

出　　处：《计算机系统应用》2015年第8期33-39,共7页Computer Systems & Applications

基　　金：福建省教育厅B类项目(JB11020)

摘　　要：提出一种基于菲涅耳全息变换和OFDM的多重虚拟三维物体水印实现方法,首先利用快速卷积算法分别计算观测面上单个虚拟三维物体的菲涅耳衍射分布,然后结合OFDM原理通过串并转换、共轭对称、IFFT和并串转换处理实现多个三维物体实值编码计算全息水印信号的设计;水印信号嵌入在载体文件小波域的水平和垂直细节分量,通过修改小波系数邻域平均值隐藏信息,并能实现盲提取.仿真实验结果表明,所提出的方法对剪切、滤波、JPEG压缩等攻击表现出较强的稳健性,特别是具有良好的抗剪切性能.A watermark method on Fresnel hologram transformation and OFDM for multiple three-dimensional objects has been proposed. First, the fast convolution algorithm is used to calculate the Fresnel diffraction distribution of the single virtual three-dimensional object in the observed plane. Then, combining with OFDM principle procedures such as parallel-serial conversion, conjugate symmetry, IFFT and parallel-serial conversion are followed to design real coding computer-generated holographic watermark. Watermark signal is embedded in the horizontal and vertical detail components of the wavelet domain by changing neighbor wavelet coefficient to hide information and the watermark can be blind extracted. The simulation results show that the approach behaves good robustness on cropping, filtering, JPEG compression, etc. Especially the approach shows good performance for cropping operation.

关 键 词：菲涅耳计算全息 正交频分复用 虚拟三维物体 数字再现 数字水印 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]