基于图像和H264视频的可逆信息隐藏算法研究

发布时间：2018-03-28 00:18

本文选题：信息隐藏　切入点：图像　出处：《广西师范大学》2017年硕士论文

【摘要】：信息隐藏技术是一种将秘密信息嵌入到文本、音频、图像以及视频等数字媒介中的技术。信息隐藏技术应用于多个领域,由于隐藏的信息能避免攻击者的注意,从而实现对隐藏信息的保护。信息隐藏分为不可逆和可逆信息隐藏。不可逆隐藏算法隐藏容量大,提取秘密信息后原始图像无法完全恢复。可逆信息隐藏技术在提取秘密信息时,可以无损的恢复载体图像。因此研究基于图像和H264视频的可逆信息隐藏算法,具有重要的意义。本文对数字图像和H264视频为载体的无损信息隐藏进行研究,提出了基于多预测值分类的可逆隐藏算法和基于H264/AVC视频的可逆隐藏算法,具体内容如下:1、提出一种基于多预测值分类的可逆信息隐藏算法。通过多种预测算子对像素值进行预测,通过最大预测值和最小预测值与当前像素值的关系进行分类。根据最大和最小预测值确定最优预测值及其下标,计算当前像素值与最优预测值的差值,然后选择相应差值隐藏秘密信息。该方法能够准确提取秘密信息,并恢复原始载体图像,隐藏信息后的图像具有较好的峰值信噪比。2、提出了一种基于H264/AVC视频的可逆隐藏算法。结合H264编码过程,在I帧内亮度宏块中统计4×4DCT子块前15个系数中的非零系数个数,选取个数较多的子块作为嵌入区域,将秘密信息隐藏在最后一个系数中。该算法在提取秘密信息后,能够无损恢复原始视频,具有较大的隐藏信息容量,能保持较好的视频质量。
[Abstract]:Information hiding technology is a kind of technology that embed secret information into digital media such as text, audio, image and video. Information hiding technology is applied in many fields, because hidden information can avoid the attention of attackers. Thus the protection of hidden information is realized. Information hiding is divided into irreversible and reversible information hiding. The original image can not be completely restored after extracting secret information. Reversible information hiding technology can recover the carrier image without loss when extracting secret information. Therefore, the reversible information hiding algorithm based on image and H264 video is studied. This paper studies lossless information hiding based on digital image and H264 video, and proposes reversible hiding algorithm based on multi-predictive value classification and reversible hiding algorithm based on H264/AVC video. The specific contents are as follows: 1. A reversible information hiding algorithm based on the classification of multiple prediction values is proposed. The pixel value is predicted by a variety of prediction operators. According to the relationship between the maximum and the minimum predictive value and the current pixel value, the optimal prediction value and its subscript are determined according to the maximum and minimum prediction values, and the difference between the current pixel value and the optimal prediction value is calculated. Then the secret information can be extracted accurately and the original carrier image can be recovered by selecting the corresponding difference value to hide the secret information. A reversible hiding algorithm based on H264/AVC video is proposed in this paper. Combining with H264 coding process, the number of non-zero coefficients in the first 15 coefficients of 4 脳 4DCT subblock is counted in the brightness macroblock of I frame. A large number of sub-blocks are selected as embedded regions to hide the secret information in the last coefficient. After extracting the secret information, the algorithm can recover the original video without loss and has a large hidden information capacity. Be able to maintain good video quality.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.41;TP309

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