數(shù)字圖像水印算法研究及DSP實現(xiàn)
[Abstract]:In recent years, the rapid development of Internet and the wide application of digital multimedia technology have greatly facilitated people's study and work, enriched people's daily life, but the copyright protection of digital products has become increasingly urgent. Under this background, as a new technology of copyright protection and content authentication of multimedia data, digital watermarking technology has become a hot topic of academic research at present, and has important theoretical research value and wide application prospect. In this paper, the digital image watermarking algorithm is studied and implemented on DSP hardware platform. Firstly, this paper briefly introduces the basic theory of digital watermarking technology, the basic frame of digital watermarking algorithm, its classification and evaluation standard, and summarizes several common watermarking signal preprocessing methods and watermark attack types. Secondly, on the basis of studying the basic theory and developing trend of digital watermarking technology, the problems and difficulties of the main algorithms are found, and the non-sampling Contourlet transform and the scale invariant feature transformation are used. The singular value decomposition and local feature region are introduced into the digital image watermarking technology. Two algorithms are proposed to improve the robustness of the image watermarking algorithm against geometric attacks, and the watermarking capacity of the algorithm is improved. The simulation results show that the proposed algorithm is robust to geometric attack. These two algorithms are robust to noise, filtering, compression and various geometric attacks. Finally, the implementation of digital image watermarking products, such as digital camera with watermark authentication function, is discussed. A digital image watermarking hardware system based on TMS320DM642 is designed, which has anti-counterfeiting function, such as watermark printer, watermark detector and so on. The structure of TMS320DM642 and the integrated development environment CCS are introduced briefly. The hardware and software design of each module of upper computer and target machine and the final experimental results are given.
【學位授予單位】:湖南師范大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:TP309.7;TP368.1
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