本文選題：數(shù)字圖像水印 + 離散余弦變換　； 參考：《蘇州大學(xué)》2013年碩士論文

【摘要】：互聯(lián)網(wǎng)的發(fā)展給人們獲取數(shù)字作品越來(lái)越方便，但是數(shù)字產(chǎn)品的版權(quán)問(wèn)題也日益突出，迫切需要一種新技術(shù)對(duì)數(shù)字產(chǎn)品信息的版權(quán)、完整性和真實(shí)性進(jìn)行保護(hù)。數(shù)字水印技術(shù)通過(guò)將一些有特殊意義的信息嵌入到數(shù)字產(chǎn)品中，通過(guò)對(duì)嵌入信息的提取與檢測(cè)分析，用以證明原創(chuàng)作者的版權(quán)所有權(quán)，有效解決了數(shù)字產(chǎn)品的知識(shí)產(chǎn)權(quán)保護(hù)問(wèn)題。本文在分析和研究國(guó)內(nèi)外數(shù)字水印技術(shù)現(xiàn)狀并借鑒了前人研究成果的基礎(chǔ)上，重點(diǎn)研究了基于變換域的數(shù)字圖像水印技術(shù)算法，設(shè)計(jì)了基于變換域的兩種數(shù)字圖像水印算法，并分別進(jìn)行仿真實(shí)驗(yàn)測(cè)試以驗(yàn)證算法的有效性和可行性。 1、提出了一種簡(jiǎn)單的基于離散余弦變換的數(shù)字圖像水印算法。該算法首先將整幅圖像分成塊，對(duì)每一塊分別進(jìn)行DCT計(jì)算，在每一塊中選取合適頻段的系數(shù)，將水印信息分散嵌入到每一塊所選取的DCT系數(shù)中，本算法簡(jiǎn)單且易于實(shí)現(xiàn)。實(shí)驗(yàn)結(jié)果表明該算法的水印不可見性較好。針對(duì)一般的攻擊，水印具有較好的魯棒性，但是針對(duì)大幅度的剪切攻擊，提取水印效果較差。 2、提出了一種基于奇異值分解和離散余弦變換的數(shù)字圖像水印算法。該算法對(duì)分塊DCT變換的系數(shù)矩陣進(jìn)行SVD變換，奇異值分解的穩(wěn)定性、隱藏性和降秩的特性有利于增強(qiáng)嵌入水印的不可見性和魯棒性，MATLAB仿真結(jié)果表明，算法具有較好的不可見性和抗JPEG壓縮、高斯通濾波和旋轉(zhuǎn)等能力，，同時(shí)對(duì)大幅度剪切攻擊也具有較好的魯棒性。
[Abstract]:With the development of Internet, it is more and more convenient for people to obtain digital works, but the copyright problem of digital products is becoming more and more serious. Therefore, a new technology is urgently needed to protect the copyright, integrity and authenticity of digital product information. Digital watermarking technology by embedding some special information into digital products, through the extraction of embedded information and detection and analysis, to prove the copyright ownership of the original creator. Effectively solve the problem of intellectual property protection of digital products. On the basis of analyzing and studying the current situation of digital watermarking technology at home and abroad and referring to the previous research results, this paper focuses on the digital image watermarking algorithm based on transform domain, and designs two digital image watermarking algorithms based on transform domain. Simulation experiments were carried out to verify the validity and feasibility of the algorithm. 1. A simple digital image watermarking algorithm based on discrete cosine transform is proposed. The algorithm first divides the whole image into blocks, calculates each block separately by DCT, selects the appropriate frequency band coefficients in each block, and distributes the watermark information into the selected DCT coefficients of each block. The algorithm is simple and easy to implement. Experimental results show that the watermark is invisible. For general attacks, the watermark has good robustness, but for the large clipping attack, the watermark extraction effect is poor. 2. A digital image watermarking algorithm based on singular value decomposition and discrete cosine transform is proposed. The algorithm performs SVD transform on the coefficient matrix of block DCT transform. The stability of singular value decomposition, concealment and rank reduction are helpful to enhance the invisibility and robustness of embedded watermark. The algorithm has better invisibility and anti-JPEG compression, high stone filtering and rotation capabilities, and is also robust to large shear attacks.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TP309.7

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