本文關(guān)鍵詞： 可逆視頻信息隱藏 H.264/AVC 直方圖平移 矩陣編碼 混合編碼 比特率增長率 CAVLC熵編碼　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著計算機(jī)和網(wǎng)絡(luò)技術(shù)的快速發(fā)展,傳統(tǒng)媒體逐漸地被數(shù)字媒體所取代。但是在數(shù)字多媒體技術(shù)使我們的生活越來越便捷的同時,卻也帶來了很多安全隱患,例如版權(quán)保護(hù)、非法竊取和惡意篡改等問題。信息隱藏技術(shù)的提出在一定程度上消除了數(shù)字多媒體的一些安全隱患,同時還開拓了諸如錯誤恢復(fù),多媒體標(biāo)簽和秘密通信等領(lǐng)域的新方向。但是隨著信息隱藏技術(shù)的不斷發(fā)展,人們逐漸發(fā)現(xiàn)在一些領(lǐng)域中并不是所有的信息隱藏技術(shù)都能很好地應(yīng)用到實際當(dāng)中。為了更進(jìn)一步提高信息隱藏技術(shù)在這些領(lǐng)域當(dāng)中的性能,學(xué)術(shù)研究者提出了可逆信息隱藏技術(shù),以彌補(bǔ)部分領(lǐng)域應(yīng)用中的缺陷。數(shù)字視頻作為多媒體的重要媒體形式之一,現(xiàn)已得到廣泛應(yīng)用,由于H.264/AVC視頻編解碼標(biāo)準(zhǔn)在數(shù)字視頻的各個服務(wù)領(lǐng)域當(dāng)中較為常見,本文針對這一標(biāo)準(zhǔn)進(jìn)行了如下的研究工作:(1)針對H.264/AVC視頻編解碼標(biāo)準(zhǔn)中熵編碼過程,本文提出了一種基于混合編碼的低比特率增長可逆視頻信息隱藏算法。該算法充分利用了 H.264/AVC視頻編解碼標(biāo)準(zhǔn)中CAVLC熵編碼特性,結(jié)合傳統(tǒng)的直方圖平移和矩陣編碼算法的思路,設(shè)計出一種混合編碼算法,并針對P幀4×4小塊的拖尾系數(shù)和非拖尾系數(shù),分別使用直方圖平移和混合編碼算法嵌入秘密信息�；旌暇幋a算法在拖尾系數(shù)上的使用使得修改一個系數(shù)能夠嵌入4比特秘密信息,降低了單位嵌入容量下系數(shù)的修改量,從而降低了含密視頻的比特率增長率,同時提高了含密視頻的視頻質(zhì)量。(2)利用CAVLC熵編碼的特性,充分考慮DCT量化后系數(shù)的分布特點,設(shè)計出一種適用于拖尾系數(shù)的大容量可逆視頻信息隱藏算法。該算法能夠在4×4塊的拖尾系數(shù)上進(jìn)行多重嵌入,大幅度地提高了算法的嵌入容量,同時保證含密視頻的比特率性能相較于現(xiàn)有算法依然具有一定的優(yōu)勢。
[Abstract]:With the rapid development of computer and network technology, traditional media are gradually replaced by digital media. But while digital multimedia technology makes our life more and more convenient, it also brings a lot of security risks, such as copyright protection. Problems such as illegal theft and malicious tampering. To some extent, information hiding technology has eliminated some security risks of digital multimedia, and has also opened up such problems as error recovery. New directions in the fields of multimedia tags and secret communications. But with the development of information hiding technology, People are gradually discovering that not all information hiding techniques can be applied to practice in some fields. In order to further improve the performance of information hiding technology in these fields, Researchers have put forward reversible information hiding technology to remedy the defects in some applications. Digital video, as one of the important media forms of multimedia, has been widely used. Because H.264 / AVC video coding and decoding standard is more common in various service fields of digital video, this paper has carried out the following research work on this standard: 1) Entropy coding process in H.264 / AVC video coding and decoding standard. In this paper, a low bit rate increasing reversible video information hiding algorithm based on hybrid coding is proposed. The algorithm makes full use of the CAVLC entropy coding characteristic of H.264 / AVC video coding standard and combines the traditional histogram translation and matrix coding algorithms. A hybrid coding algorithm is designed, and the trailing coefficients and non-trailing coefficients of P frame 4 脳 4 block are designed. Histogram translation and hybrid coding algorithms are used to embed secret information respectively. The use of hybrid coding algorithm in trailing coefficients enables the modification of a coefficient to embed 4 bits of secret information, thus reducing the amount of modification of coefficients under unit embedding capacity. Thus, the bit-rate growth rate of the encrypted video is reduced, and the video quality of the encrypted video is improved. (2) using the characteristics of CAVLC entropy coding, the distribution characteristics of the coefficients after DCT quantization are fully taken into account. A large capacity reversible video information hiding algorithm suitable for trailing coefficients is designed. The algorithm can be used to embed the trailing coefficients of 4 脳 4 blocks, which greatly improves the embedding capacity of the algorithm. At the same time, it still has some advantages over the existing algorithms to ensure the bit rate performance of dense video.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.81

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相關(guān)期刊論文 前1條

1 張維緯;張茹;劉建毅;伍淳華;鈕心忻;楊義先;;一種基于H.264/AVC的視頻可逆脆弱水印算法[J];電子與信息學(xué)報;2013年01期

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本文編號：1495892