算法数字防伪光栅的设计与评价

以相位调制潜像法光栅防伪技术为基础,设计一种通过算法来实现的数字光栅,并对其进行质量评价。数字光栅是光栅防伪中提取潜像的唯一工具,结合宿主图像分辨率、加网线数、光栅条空比的量化关系,利用Matlab完成两种不同类型数字光栅的制作并获得清晰提取图像;通过主观和CISI、FI、TI三种客观方法对该算法实现的数字光栅提取潜像质量进行了评价,并与软件法光栅的质量进行了比较。算法光栅能够提取清晰的防伪潜像,提取质量优越于软件光栅且在品红和青通道有较好的适用性。算法光栅对相位调制光栅防伪方法有普遍的适用性,光栅精度高,应用效果较好。

Fabrication and Evaluation of Digital Raster Extraction Method

The aim of this study is using algorithm to realize a kind of image anti-counterfeiting extraction method based on Sub-channel Phase Adjustment, and then assessing the quality.Digital grating is the only tool to extract the hidden image, using the relationship between the resolution of the host image, the number of the mesh lines and the void ratio of the grating produces digital grating and obtains clear image in Matlab.It assesses the quality of digital grating by visual observation and CISI,FI,TI method, and compares with the grating quality obtained by software method.Algorithm grating`s extract quality is better than software grating, it has good applicability in magenta and green channel.The digital raster extraction method is applicable to grating anti-counterfeiting technology based on phase modulation.