Design Of Image Anti-counterfeiting Authentication System Based On Digital Watermarking

In the contemporary era,with the rapid development of digital image processing technology,people can easily tamper with images by using image processing software such as Photoshop,which makes the originality and authenticity of digital images threaten as never before.It also has a huge negative impact on the news,justice of judicial,economy,academic and other social fields.Therefore,the image forensics technology used to detect the authenticity of images has the graveness and profound meaning.At the same time,various forensic systems are also emerging.However,most of the existing forensic systems applies passive forensics technology,yet none of them is mature.The algorithms generally have shortcomings such as weak robustness or can only detect a single tampering method,so the utility of system is discounted.Based on the current popular website development technology and the development of more mature digital watermarking active forensics technology,this thesis design and implement the image anti-counterfeit authentication system.It is used to meet the needs of news media,photography,law enforcement,forensics and other industries or scenes for the authenticity and originality of digital images.By analyzing the development of the current digital watermarking algorithm and taking into account the wide application of the JPEG image format,a JPEG fragile watermarking algorithm with better performance is selected.This algorithm can resist JPEG compression better and is sensitive to other tampering operations.It satisfies the need for the system to identify the authenticity of the image.Based on the analysis of the specific application scenarios of the system,Firstly,this thesis analyze the requirements of the system by using flow chart and use case diagram,clarifying the services and functions that the system needs to meet.Then,the structure,function module,database and technology selection of the system are analyzed and designed.Finally,this system apply current popular Android development technology and website development technology implement various functional modules of the system.The system will embed digital watermark in the first time after the photo is taken to protect its authenticity and integrity,then judge whether the image has been tampered by extracting and detecting the watermark through the identification platform located in the cloud server.After testing,the system can effectively detect whether the picture has tampering operation and can locate the tampering area.In addition,on the basis of satisfying the core functions oftamper detection,the system extends the design of other functional modules,making the application of the system more convenient and reasonable.