结合改进矩阵编码的奇异值修改视频隐写算法

针对当前视频隐写算法鲁棒性较低以及对载体修改率较大等问题,提出一种结合改进矩阵编码的奇异值修改视频隐写算法.先对视频帧进行分块,然后取出每块中的最大奇异值,并根据改进的矩阵编码进行信息嵌入.实验结果表明:算法具有较好的视觉不可见性,并在修改率较小的前提下具有较大的嵌入容量,并对视频载体的比特率影响较小,在模拟网络环境中噪声、滤波攻击后位错率(BER)较小.     

基于帧内预测模式修改的视频隐写算法

针对隐写载体为视频的特点,提出了一种新的基于帧内预测模式修改的H.264视频隐写算法.算法通过改进的局部二值模式方法选择所要嵌入区域,判断嵌入块的帧内预测模式,并将嵌入块分组,然后将与Logistic映射产生的混沌序列处理后的秘密信息经过预定的嵌入规则进行隐写,通过拉格朗日率失真优化算法改变帧内预测模式.实验结果表明,算法具有较好的视觉不可见性以及较高的嵌入效率,并且隐写后比特率增加量较小,同时具有较高的嵌入容量.     

基于贝叶斯网络模型的舰船通信信息传输隐写算法设计

舰船通信信息的加密传输对于海上信息平台的正常运转具有重要意义,传统通信信息传输隐写算法的安全性和抗检测性较差,为此提出一种基于贝叶斯网络模型的舰船通信信息传输隐写算法设计.基于贝叶斯网络预测模型设计了隐写算法的实现流程,并选择隐匿性较强的区域作为信息载体;利用贝叶斯模型对通信信息进行编码和解码行为,并保持信息奇异值的稳定;经过GHM变换得到含有密文的信息载体,实现对舰船通信信息的高精度隐匿传输.仿真实验结果表明,提出的隐写算法设计具有较强的不可预见性,抗检测性统计优于传统算法,同时在解码延迟方面相对于传统算法分别降低了8.75%和9.45%.     

基于GAN的视频隐写算法

视频隐写术是一种将视频作为嵌入载体实现隐蔽通信的技术。为了解决视频隐写算法中最优修改概率矩阵生成困难的问题,提高信息传输的隐蔽性,提出了一种基于生成对抗网络(generative adversarial network, GAN)的视频隐写算法,该算法包含两种生成对抗网络,分别生成原始载体与修改概率矩阵,前者能够生成视频的静态后景、动态前景与掩模;后者将前景作为隐写生成器的输入,以提高修改概率矩阵的内容自适应性,并利用Tanh-simulator函数拟合最优嵌入函数,促进梯度的反向传播,基于三维卷积网络的隐写分析器作为隐写判别器,它与隐写生成器进行博弈训练以提高载密样本的抗检测性。实验结果表明,视频生成模块不仅能生成逼真的视频,且前景能够代表视频中的时空特征信息,本算法与经典的S-UNIWARD算法相比,在0.05、0.1、0.3 bpc(bit per channel)的嵌入率下,抵抗彩色隐写分析器SCRM检测的能力提高了0.65%～3.26%。     

基于运动矢量的视频隐写算法

视频信息隐藏是一种将秘密信息嵌入到视频中实现隐蔽传输的技术.基于运动矢量(motion vector,MV)的视频隐写造成的运动矢量特性异常容易被隐写分析所检测,隐蔽通信的安全性降低.为了保持运动矢量相邻相关性和局部最优性,提出了一种基于运动矢量的视频隐写算法能够降低对运动矢量特性的破坏.首先,实验验证已有基于运动矢量的视频隐写算法对运动矢量不同分量的影响存在差异.然后,引入归一化互信息(normalized mutual information,NMI)衡量运动分量的相邻相关性,根据载体选择策略选择相邻相关性小的分量作为嵌入载体.最后,定义宏块纹理复杂度作为载体修改的失真代价,利用校验格编码(syndrome-trellis code,STC)对载体进行信息嵌入.实验结果表明,隐写视频的峰值信噪比(peak signal to noise ratio,PSNR)和结构相似性(structural similarity,SSIM)降低不超过0.4％,一般低于0.25％;比特率增加0.29％ ～2.35％;算法被相关异常特征检测的错误率较高,具有更均衡的安全性.可见,算法各项性能指标表现良好,具有较好的抗隐写分析能力,隐写视频不可感知性较好.     

基于信息隐藏的视频隐蔽通信算法

针对当前视频隐蔽通信算法对视频质量以及码率有较大影响的问题,结合H.264/AVC编码标准,提出了一种新的视频隐蔽通信算法。算法根据离散余弦变换特点,对块依据纹理块判别准则进行判断,修改某些低频系数来进行嵌入。实验结果表明,该算法对视频质量和码率有较小影响,并具有隐写容量大、抗隐写分析较好等优点。     

基于纹理特征的H.264视频隐写算法

针对当前视频隐蔽通信算法对视频质量以及码率有较大影响的问题,结合H.264/AVC编码标准,提出了一种新的视频隐蔽通信算法。算法根据离散余弦变换特点,对块依据纹理块判别准则进行判断,修改某些低频系数来进行嵌入。实验结果表明,该算法对视频质量和码率有较小影响,并具有隐写容量大、抗隐写分析较好等优点。     

梅森旋转算法影响下的舰船传输网络数据隐写技术研究

为克服传统网络数据隐写技术解码率过高的问题,在梅森旋转算法框架下提出基于LSB技术的舰船传输网络数据隐写技术研究。分析了梅森旋转算下数据隐写技术的实现原理,并基于LSB构建图像像素的多比特二进制结构;利用密钥建立比特流与图像像素字节之间的对应关系,将密文嵌入载体图像中;在图像的解码过程中将隐藏于载体中的密文消息转换为二进制值嵌入比特序列,实现舰船网络数据传输的解码。仿真数据表明,提出的隐写技术在多嵌入率条件下的峰值信噪比更稳定,载密图像的解码率更低。     

基于四元数小波变换和奇异值分解的图像水印

文章提出了基于四元数小波变换(QWT)和奇异值分解(SVD)的数字图像水印算法,该算法对原始载体图像进行四元数小波变换和奇异值分解,对水印图像进行Arnold变换和奇异值分解,并把分解的水印嵌入到分解后的原始载体图像中.结果表明,该算法对高斯噪声、剪切、JPEG压缩及滤波具有较强的鲁棒性.     

一种针对LSB匹配隐写的视频隐写分析方法

针对视频LSB匹配隐写,提出了一种基于区域相关性原理,通过构造区域相关性图直接提取载体或载密视频帧特征,应用中值滤波去除不同视频载体之间的特征差异,逐帧进行视频隐写分析的方法.实验结果表明,该算法能有效检测每帧均进行嵌入且嵌入率仅为p=0.1时的视频,而且在只对20%的视频帧进行混合嵌入的情况下,也能达到90.91%的正确检测率.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that