基于DWT和模块2DPCA的红外人脸识别方法

提出一种结合图像离散小波变换和模块2DPCA的方法.首先通过DWT将红外人脸图像通过小波一级分解成4个子带,用模块2DPCA的方法对4个子带进行特征提取,得到4个子带的特征向量,然后对每个子带进行分类,将所得4个识别结果进行决策融合,得到最终的识别结果.同基于PCA和模块2DPCA方法相比,所提出的方法能很好利用人脸图像的有用判别信息,并得到更好的识别效果.     

基于分块的2DPCA人脸识别方法

文章将分块理论与2DPCA方法相结合,研究分块二维主成分分析法（M-2DPCA）在人脸识别中的应用。对人脸图像矩阵进行分块,用形成的子图像矩阵直接构造总体散布矩阵并求解对应的特征向量,利用提取的特征向量对图像进行特征的提取与分析,进行人脸识别。基于Yale人脸数据库的实验显示,在相同训练样本和特征向量条件下,M-2DPCA比2DPCA算法具有更高的识别率。结论 M-2DPCA充分利用了图像的协方差信息,在人脸识别方面具有较高的识别率和鲁棒性方面,对进一步研究人脸识别具有重要的意义。     

基于AMD度量和类间模块2DPCA的人脸识别算法

文章提出了一种基于集成矩阵距离(AMD)和类间散布矩阵构造的模块2DPCA人脸识别方法.针对原模块2DPCA算法的不足,使用类间散布矩阵代替总体散布矩阵,求得最佳特征向量并对图像进行特征提取;采用集成矩阵距离的度量方式计算特征图像的相似度,实现人脸分类.在ORL人脸库上的实验结果表明,同2DPCA和普通模块2DPCA相...     

基于分块的2DPCA人脸识别方法

将分块理论与2DPCA方法相结合,研究分块二维主成分分析法（M-2DPCA）在人脸识别中的应用.对人脸图像矩阵进行分块,用形成的子图像矩阵直接构造总体散布矩阵并求解对应的特征向量,利用提取的特征向量对图像进行特征的提取与分析,进行人脸识别.基于Yale人脸数据库的实验显示,在相同训练样本和特征向量条件下,M-2DPCA...     

DCT和2DPCA降维与识别算法的比较研究

首先分析了DCT用于特征降维的可行性,并给出了DCT特征降维的基本原理.然后以人脸识别和人脸表情识别为背景,在DCT和2DPCA具有相当的降维效果时,给出了DCT比2DPCA具有较高的人脸识别率和人脸表情识别率的理论分析.最后,利用AT&T人脸库和JAFFE人脸表情库,分别对DCT和2DPCA进行了比较仿真实验.     

基于WT-W2D2DPCA的人脸识别算法研究

人脸识别过程中,针对二维主成分分析(2DPCA)算法在特征提取和数据降维上存在的问题,本文首先引入双向二维主成分分析(2D2DPCA)算法,该算法同时考虑图像行与列方向上的信息.考虑到人脸图像存在信息冗余而影响识别率的问题,于是本文提出一种基于小波加权双向二维主成分分析(WT-W2D2DPCA)的人脸识别算法.该算法首先采用二级小波分解对人脸图像进行预处理,提取其低频部分;然后根据人脸图像的特性,将低频部分进行奇偶分解,并引入加权思想,重组低频人脸图像,最后在ORL人脸数据库上进行双向二维主成分分析.实验结果表明,该方法不仅克服了传统2DPCA系数矩阵大的问题,而且得到了比传统的2DPCA、2D2DPCA算法更好的识别效果.     

基于图像梯度和2DPCA的单样本人脸识别

提出了一种基于图像梯度的2DPCA的算法用于单样本人脸识别。采用图像梯度方法进行人脸识别具有光照不变性、能提取丰富的局部纹理信息等优点,但是这种方法只考虑了图像的局部信息,并没有充分利用全局信息。基于这种问题,文章考虑融合全局和局部信息进行单样本人脸识别。对于全局人脸信息的提取,采用2DPCA方法,相对与传统PCA方法,2DPCA能够在不破坏图像二维结构的基础上进行全局信息提取。由于上述两种方法在图像匹配时所采用的匹配算法不一致,文章根据两种匹配方式的特点进行改进和融合,提出了一种新的匹配方案。实验证明,基于图像梯度和2DPCA的算法在单样本人脸识别问题上识别率优于传统方法。     

基于DCT和2D—PCA的人脸识别算法研究

提出了一种对角DCT和模块2DPCA相结合的人脸识别方法．该算法首先将人脸图像转换成对角图像,提取人脸的行、列与结构信息以求解最优识别向量．然后利用DCT压缩以去掉人眼不敏感的中频分量与高频分量,再由IDCT重建人脸图像,这样有限降低了所需特征的维数,减少了计算量．然后通过模块2DPCA进行特征提取得到人脸识别特征,最后运用最近邻分类器完成人脸的识别．基于ORL及Yale人脸数据库的实验结果证明了该算法的有效性与稳健性．     

一种局部保留C2DPCA人脸特征提取方法

 首先分析了主成分分析(PCA)、二维主成分分析(2DPCA)以及完全二维主成分分析(C2DPCA)存在的不足,针对PCA方法不能解决的小样本问题以及2DPCA和C2DPCA存在对所有识别信息都采用同等对待的不足,提出了局部保留的C2DPCA方法,此方法首先将人脸图像划分为5个区域,并对双眼、嘴唇和轮廓进行保留,其它部分采用降低其散列度的方式进行处理,然后再采用C2DPCA方法进行数据降维和特征提取,经过在ORL人脸数据库上实验研究表明,与C2DPCA相比在进一步降低了特征矩阵的维数的基础上又提高了识别率,并且在识别率方面优于经典的Fisherfaces和ICA方法.     

参考中性表情的人脸表情识别

为充分利用视频中人脸表情与中性表情的差异,提出了一种新的对非特定人脸的表情识别方法.该方法针对低复杂度的视频表情识别应用场景,利用参考中性表情的特征点偏移角表征被测表情的变化信息,同时利用二维主成分分析(2DPCA)法提取被测表情帧的二维主成分特征,从而综合使用表情的动态和静态特征,并使用支持向量机分类器进行表情分类识别.在JAFFE人脸表情库上的实验结果表明,相对于仅使用2DPCA的静态图像表情识别方法,文中所提方法的人脸表情识别准确率平均提高7%.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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