半色调图像隐藏信息的三维显示技术研究

Research on 3D display technology of halftone image hidden information

半色调图像信息隐藏技术由于其防伪信息多变、解码高效、成本低等优势,被广泛应用于印刷品防伪中.但传统的信息隐藏基于单色版完成,提取信息以平面图像再现.为了将隐藏信息以三维立体效果再现,本文研究了在两个色版中嵌入隐藏信息,并采用组合光栅再现其三维效果的方法,通过主客观相结合的方式分析图像的防伪性能,得到了最佳防伪参数.结果表明,信息隐藏的三维再现效果理想的参数设置范围为:防伪母版组合为品红色版+黑色版,加网线数>100线/英寸,防伪主图像的网点面积率为20%~60%.本研究隐藏信息三维再现的视觉效果,增加了图像的仿制难度,丰富了半色调隐藏图像的再现形式,为防伪印刷提供了可靠的数据支撑.

The halftone image information hiding technology is widely used in the anti-counterfeiting of printed materials because of its advantages of variable anti-counterfeiting information,high decoding efficiency and low cost.The traditional information hiding is done based on the monochrome version,and the information is extracted as a flat image.In order to reproduce the hidden information in three-dimensional effect,this paper studies the method of embedding hidden information in two color plates and reproducing its three-dimensional effect by using a combined grating.The anti-counterfeiting performance of the image is analyzed by combining subjective and objective methods,and the best anti-counterfeiting parameters are obtained.The ideal parameter setting range of information hiding is:the anti-counterfeit master combination is magenta version+black version,the number of screen lines is>100 lines/inch,and the dot area ratio of the security main image is 20%~60%.Visual effect of the three-dimensional reproduction of the hidden information studied in the paper increases the difficulty of imitation of the image,enriches the reproduction form of the halftone hidden image,and provides reliable data support for anti-counterfeiting printing.