【摘要】：近年來(lái),互聯(lián)網(wǎng)絡(luò)的飛速發(fā)展和數(shù)字多媒體技術(shù)的廣泛應(yīng)用極大地方便了人們的學(xué)習(xí)和工作,豐富了人們的日常生活,但數(shù)字產(chǎn)品的版權(quán)保護(hù)也顯得日益迫切。在這種背景下,數(shù)字水印技術(shù)作為一種多媒體數(shù)據(jù)的版權(quán)保護(hù)和內(nèi)容認(rèn)證的新技術(shù),成為了目前學(xué)術(shù)研究的一大熱點(diǎn),具有重要的理論研究?jī)r(jià)值和廣泛的應(yīng)用前景。本文主要針對(duì)數(shù)字圖像水印算法進(jìn)行了深入研究并將算法在DSP硬件平臺(tái)上進(jìn)行了實(shí)現(xiàn)。 本文首先簡(jiǎn)要介紹數(shù)字水印技術(shù)的基本理論、數(shù)字水印算法的基本框架以及其分類和評(píng)價(jià)標(biāo)準(zhǔn),總結(jié)了幾種常見(jiàn)的水印信號(hào)預(yù)處理方法和水印攻擊類型；其次在充分研究數(shù)字水印技術(shù)的基本理論及發(fā)展趨勢(shì)的基礎(chǔ)上,找出現(xiàn)有主要算法存在的問(wèn)題及難點(diǎn)所在,將非抽樣Contourlet變換、尺度不變特征變換、奇異值分解以及局部特征區(qū)域等理論引入到數(shù)字圖像水印技術(shù)中,提出兩種算法提高圖像水印算法抗幾何攻擊的魯棒性,提升算法的水印容量,仿真實(shí)驗(yàn)結(jié)果表明,這兩種算法對(duì)于噪聲、濾波、壓縮以及各類幾何攻擊具有較好的魯棒性；最后針對(duì)數(shù)字圖像水印產(chǎn)品的實(shí)現(xiàn)問(wèn)題,如具有水印認(rèn)證功能的數(shù)碼照相機(jī),具有防偽功能的水印打印機(jī)、水印檢測(cè)器等,設(shè)計(jì)了一個(gè)基于TMS320DM642的數(shù)字圖像水印硬件系統(tǒng),對(duì)TMS320DM642的結(jié)構(gòu)及集成開(kāi)發(fā)環(huán)境CCS進(jìn)行了簡(jiǎn)要介紹,給出上位機(jī)和目標(biāo)機(jī)各模塊的軟硬件設(shè)計(jì)以及最終的實(shí)驗(yàn)結(jié)果。
[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(xué)位授予單位】：湖南師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TP309.7;TP368.1

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