Digital Image Content Authentication System For The Public Security System

In recent years, the multimedia has become a main way for information communication and an important part of our life along with the wide use of network. At the same time, multimedia information security problems including copyrights piracy emerge as side effects of the popularity of digital representation and distribution over network. The ease of tampering with multimedia content makes the study of effective content authentication methods for multimedia information a hot issue among the related research fields. As the most important evidence, the images always decide the result that made by policemen and judges. The illegal modification of images could get the expected result. The serious infection has been focused on by policemen and the departments concerned and should be solved urgently.Fragile watermark is the efficient way to define whether the images were tampered or not. The dissertation research the issue based on watermark. The top is the integrated authentication of digital image. We do some work on it for the police system.We study on the digital watermarking technique particularly the authentication watermarking technique. The key is to put forward two kinds of digital watermarking projects of the integrated authentication of digital images: fragile and semi-fragile digital watermarking and point out its limits through the analysis of current typical model calculation ways home and abroad from different angles. On this foundation, carried out the analysis to its experiment and proved the rationality of this algorithm.