改进零视差像素点重组的图像数字水印算法  

Image Digital Watermarking Algorithm Based on Improved Zero Disparity Pixel Reconstruction

作　　者：李播阳 张频[1] 吴江[2] LI Bo-yang;ZHANG Pin;WU Jiang(Jiangxi University of Technology,Nanchang Jiangxi 330003,China;School of Architecture and Design,Nanchang University,Nanchang Jiangxi 330031,China)

机构地区：[1]江西科技学院,江西南昌330003 [2]南昌大学建筑与设计学院,江西南昌330031

出　　处：《计算机仿真》2023年第2期244-248,共5页Computer Simulation

基　　金：江西省教育厅科技项目(GJJ212004)。

摘　　要：针对三维图像数字水印无法同时保证良好的视觉感受与抗攻击性能的问题,提出基于零视差点重组的三维图像数字水印算法。利用平面点-线模型描述三维图像,将色彩从红色、绿色、蓝色等分量转变为亮度、蓝色、红色等分量。根据视距、景深等参数,解得各像素点的视差值,基于零视差像素点及对应窗口归一化协方差,调整各像素点坐标,得到重组图像。将重组图像作为待嵌入水印的载体图像,结合轮廓波变换策略,取得能量最大的方向图像。通过分块处理,推导出轮廓波交换系数的交换判定条件,经轮廓波逆变换、拼接、融合等操作,完成数字水印嵌入。实验结果表明,所提算法嵌入的水印视觉感知程度较低,隐秘度与安全度较高,能保证水印在取得较好视觉效果的前提下,具备较强的攻击防御能力。At present,the existing methods are unable to guarantee visual perception and anti-attack performance at the same time.Therefore,this paper presented a digital watermarking algorithm for 3D images based on zero-disparity pixel reconstruction.Firstly,the plane point-line model was used to describe the three-dimensional image,and then the color was changed from red,green and blue to brightness,blue,red and other components.According to the parameters such as the parallax distance and the depth of field,the parallax value of each pixel was solved.Based on the normalized covariance of the zero-parallax pixel and its corresponding window,the coordinates of pixels were adjusted to obtain a reconstructed image.After that,the reconstructed image was used as the carrier image to be embedded in the watermark.Combined with the contour wave transformation strategy,the direction image with the maximum energy was obtained.After blocking,the exchange judgment conditions for the contour wave exchange coefficient were deduced.Finally,the digital watermark embedding was completed through the operations of inverse contour wave transformation,splicing,and fusion.Experimental results show that the watermark embedded in the proposed algorithm has low visual perception,high privacy and security.Meanwhile,the algorithm can ensure that the watermark has strong defense ability on the premise of achieving better visual effects.

关 键 词：零视差 像素点重组 三维图像 数字水印 轮廓波变换系数 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]