The Study Of Halftone Security Technology Based On Digital Screening

With the development of technology, scanners, high-precision printers, copiers and otherprinting equipment are become general, the phenomenon of piracy are become more and more,so the demand of anti-counterfeiting is also become urgent. Now, many security ways has beenstudied, they make the phenomenon of piracy reduce in some field, but due to most of them aredepend on specific equipment and they will increase the cost of production,the application ofthese security technology is not enough. Grating anti-counterfeit technology studied in thispaper is based on security technology and halftone screening technology, it makes the securityinformation hiding in halftone image through dealing with image in some ways, the informationcan not be seen only using the corresponding grating in right angle. The security technology isnot depending on equipment, so it can be achieved in normal equipment. And grating securitytechnology will not add cost of production, so it has practical value in some field.The main content studied in this paper:â‘ studying the digital AM screening technology through analyzing the advantages anddisadvantages in grating security technology, making digital AM screening meet therequirement,and studying the way hiding security information in the time while image isscreening or after the time screening.â‘¡studying the digital FM screening technology and improving the application ofthreshold matrix based on the requirement of grating anti-counterfeit technology, also studyingthe random matrix pattern jitter screening and the way hiding security information in the timewhile image is screening in FM screening technology or after screening.â‘¢four different process security technology based on AM screening and FM screening isstudied in this paper, and the range of application is also studied.The main innovation of this paper as follows:â‘ studying the way hiding information in halftone image based on the feature of gratinganti-counterfeit technology, and the well effect of security is tested through computersimulation and printing in printer;â‘¡because of pattern jitter screening can not meet the requirements of gratinganti-counterfeit technology, through improving the application of threshold matrix,randommatrix pattern jitter screening is studied and combining the digital FM screening and gratingsecurity technology;â‘¢through using two threshold matrixes in one image, hiding security information in the timewhile image is screening, and the effect of security is tested in java program.