【摘要】：近年來(lái),隨著互聯(lián)網(wǎng)的不斷發(fā)展,圖像在網(wǎng)絡(luò)通信中扮演著愈發(fā)重要的角色,互聯(lián)網(wǎng)的開(kāi)放性也對(duì)圖像信息的安全傳輸提出了新的要求�；谛诺谰幋a的信息隱藏技術(shù)是一種新的信息安全傳輸技術(shù),其中,基于偽隨機(jī)序列的信道編碼圖像隱藏技術(shù)是近些年的研究熱點(diǎn),但其存在信息覆蓋和秘密信息嵌入位置不均勻的問(wèn)題。本文提出了一種基于Logistic序列與LDPC碼的圖像隱藏算法。針對(duì)LDPC碼低信噪比時(shí)譯碼復(fù)雜度較高的問(wèn)題,提出改進(jìn)的BP譯碼算法,通過(guò)引入校驗(yàn)子在連續(xù)三次迭代過(guò)程中是否穩(wěn)定來(lái)判定是否結(jié)束譯碼過(guò)程;針對(duì)在信息傳遞過(guò)程連乘運(yùn)算易使數(shù)據(jù)溢出的問(wèn)題,通過(guò)加入數(shù)據(jù)約束,保證相乘的信息在其表示范圍內(nèi),從而避免了數(shù)據(jù)的溢出。將Logistic序列引入到基于信道編碼的圖像隱藏的嵌入算法中,提出利用3組密鑰產(chǎn)生3個(gè)相應(yīng)長(zhǎng)度的Logistic序列并對(duì)其進(jìn)行升序排列,得到相應(yīng)的位置轉(zhuǎn)換矩陣,利用這3個(gè)位置轉(zhuǎn)換矩陣分別實(shí)現(xiàn)對(duì)秘密圖像信息的加密和秘密圖像信息的嵌入。實(shí)驗(yàn)表明,本文改進(jìn)的算法相較于其他算法對(duì)圖像具有較好的隱藏效果,可以很好的解決信息覆蓋和嵌入位置不均勻的問(wèn)題,在一定程度上平衡了安全性、不可見(jiàn)性和復(fù)雜度的問(wèn)題。
[Abstract]:In recent years, with the continuous development of the Internet, images play a more and more important role in network communication. The openness of the Internet also puts forward new requirements for the secure transmission of image information. The information hiding technology based on channel coding is a new information security transmission technology. Among them, the channel coding image hiding technology based on pseudorandom sequence is a hot research topic in recent years, but it has the problem of uneven information coverage and secret information embedding position. In this paper, an image hiding algorithm based on Logistic sequence and LDPC code is proposed. In order to solve the problem that the decoding complexity of LDPC codes is high when the SNR is low, an improved BP decoding algorithm is proposed to determine whether the decoding process is over or not by introducing whether the verifier is stable in the continuous three iterations. In order to solve the problem that the data overflow is easy to be caused by the multiplication operation in the process of information transmission, the multiplied information is guaranteed to be within its representation range by adding data constraints, thus avoiding the overflow of the data. The Logistic sequence is introduced into the embedding algorithm of image hiding based on channel coding. Three sets of keys are used to generate three Logistic sequences of corresponding length and arrange them in ascending order, and the corresponding position conversion matrix is obtained. the encryption of secret image information and the embedding of secret image information are realized by using these three position conversion matrices. The experimental results show that the improved algorithm has a better hiding effect on the image than other algorithms, and can solve the problem of uneven information coverage and embedding position, and balance the problems of security, invisibility and complexity to a certain extent.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN911.22

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本文編號(hào)：2508083