Resistance Halftone Attack Holographic Watermark Anti-counterfeiting Method And Application

Holographic watermarking technology is a promising method to address the problem of packing printing anti-counterfeiting.When applied the holographic watermark technology in the presswork,the watermark information have embedded in host image would inevitably suffer the halftone attack.And it will affect the authentic of the extract watermark information.So,explore the holographic watermark algorithm robustness to halftone attack and develop relevant anti-counterfeiting application system could promote the application of holographic watermark technology.The main research contents in this paper are as follows.Firstly,consideration the halftone characteristics of the print-and-scan image,proposed an image feature extract method based on DWT-SVD.Combined the image feature extract method and holographic technology proposed and zero-watermark algorithm used for copyright protected scheme.Combined the image feature extract method and the code scheme generate an index for every host image.And the index will be using for matching in corresponding the anti-counterfeiting watermark information in process of image authentic.That will helpful to improve the efficiency of watermark anti-counterfeiting system.Then,in order to improve halftone attack resistance ability of the watermarking algorithm,in view of the halftone characteristics and the CMYK four colors imaging principle of the printing image,proposed a double transform domain hologram watermark algorithm based on DWT-QDFT.Using multi-resolution characteristics of the DWT for separate the low-frequency areas,which is robust to halftone noise,as the embed area.Using the advantage of QDFT deal with the color image.The double transform domain algorithm can realize a good balance between the robustness and the transparency.Experiment results show that the algorithm have a good performance when suffer the signal processing attack and print-and-scan attack.Furthermore,import the rotation correction technology to complete the algorithm performance.Finally,basing the hologram zero-watermark algorithm based on DWT-SVD and half-fragile hologram based DWT-QDFT respectively,developed hologram zero-watermark copyright generate-authentic system for copyright protect and hologram watermark embed-extract-authentic system for presswork watermark anti-counterfeiting.And design the application platform for testers,clients and customers respectively.In the end has carried on the multiple sets of experiment to test the performance of the developed system and scope of application.Although,in this paper,the proposed holographic watermark algorithm and anti-counterfeiting application system have so many shortcomings,the complete application architecture has formed.And this work have positive impact for promote the holographic watermark technology applied in packaging print anti-counterfeiting.