The Design And Implementation Of An Information Leaks Investigation System Based On Print-Scan Resistant Text Watermarking

The digital watermarking technology is an rising area of research in recent years. With the continuous improvement of the level of information technology and office automation accelerated, the application of digital watermarking technology is no longer limited to copyright protection, the authenticity of identification,it has a more broad application scenarios. The print-scan resisent digital watermark is that the digital watermark information embedded into the digital image can be extracted correctly when the image is reproduced by the print and scan operation. Due to the structure of the text image is a single, simple texture features, text digital watermark is more difficult compared with the image watermark. This essay carried out a depth research in the print-scan resisent digital watermark algorithm,and then design and implement a text digital watermark alogrithm based on the euler number of character.The following is the major work:(1)Summary of the digital watermark, introduce knowledge of the digital watermark detailed,besides applications, methods of attack and countermeasures and so on.And then analysis the the characteristic the text image and the difficulty of the text watermarking, lay a foundation for the design and implementation of digital watermarking algorithm.(2)On the basis of the current text watermark, proposed a new text digital watermark alogrithm based on the euler number of character. The algorithm has a watermark large capacity and good visual effects, to meet the requirements of the the document leaked track system of watermarking algorithm.(3)Design the basic framework of information leaks investigation system.The system based on text watermarking, can track the leaking source effectively by the digital watermark. By testing it in a real environment, the system has good availability.