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Research and Improvement of Source Investigation System Based on Text Digital Watermarking

Author: QuXiaoJing
Tutor: ZuoZhengDing
School: Beijing Jiaotong University
Course: Information Security
Keywords: Text digital watermarking Source of interrogation Virtual Print Binarization Tilt detection and correction
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 75
Quote: 2
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Abstract


With the rapid development of computer and network technology, data access and exchange of information into a relatively simple process, the people by means of computer, network, scanner, printer, fax, and other electronic devices, and can facilitate the acquisition, storage, copy, dissemination of multimedia information, convenient circulation multimedia. However, this convenience also brings a serious security problem, important documents file once the leak of the national authorities and commercial organizations easily through various means illegal distribution, and it is difficult to find the source of the leaked documents, investigate who leaked the responsibility. Source interrogation system a source of illegal distribution of the document to the digital domain and the analog domain interrogation text digital watermarking technology, to provide security for the text file in e-commerce and e-government. Committal systems based on the source of the text watermark technology is a relatively new research topic has a broad application prospects in the information age of the transmission of multimedia information convenient source interrogation system research and improvement of great significance and practical value. The first text digital watermarking technology and source committal system, analysis of the status of the performance and the source of text digital watermarking interrogation system found the following problems exist in the system: (1) add a watermark to the system of multi-page documents file The process takes more processing efficiency is not high; (2) system source interrogation watermark information extraction failed. To provide system performance, this paper focuses solve the above problem, the main contents include: (1) system analysis, found that the the virtual print speed is too slow and the system does not provide a good image pre-processing functions to produce the main reason for the above problem . Raised the redesigned virtual print module to improve the efficiency of the system to process through research watermark extracted before the text image binarization algorithms and tilt detection and correction algorithms to improve the system image pre-processing functions, provide a guarantee for the successful extraction of the watermark Solutions. (2) study virtual print technology, design and implement a software platform based on the virtual print the watermark embedding to improve the virtual print quality and speed, flexible watermark embedding applied to the source interrogation system to improve the efficiency of the system (3) study the text before the watermark extraction algorithm of image binarization typical binarization algorithm performance analysis, experimental comparison of different algorithms for text image processing speed and effect. Presents an image block binary algorithm, better handling of uneven illumination image faster. The source of the research for interrogation system improve the image pre-processing module. (4) study before the watermark extraction image skew detection and correction algorithm, proposed a the image tilt detection algorithm based on the cumulative function of the blank lines can be fast and accurate image tilt detection source interrogation system can be used to improve the image pre-processing module .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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