基于MCM和CGA的人脸表情识别方法研究

提出基于灰度共生矩阵(MCM)和混沌遗传优化算法(CGA)的人脸表情识别方法(FER).为了消除遗传算法中个体在解空间内分布的不均匀性,利用混沌的随机性、遍历性和规律性,将混沌引入到遗传算法中,由此得到了混沌遗传优化算法(CGA);通过颜色共生矩阵提取出的特征和改进后的混沌遗传优化算法,将人脸表情识别的寻找感兴趣区域(ROI)和特征提取结合成一步;最后利用支持向量机(SVM)进行图像分类.经过理论和实验证明,该方法实现简单且切实可行.     

基于人脸非对称性的表情识别

阐述了一种基于人脸非对称性的表情识别算法。该算法借助非对称人脸（D-face和S-face）来表征人脸非对称性,利用增强型方差率（AVR）和改进的基于排序思想的方差率自动选取人脸非对称性特征,然后分别用欧氏距离和K-近邻（KNN）算法测定表情识别率。仿真结果表明,人脸非对称性测量包含有判决信息,应用在表情识别中可以有效提高识别的准确率。     

基于GLCM、CGA和Adaboost的人脸表情识别方法研究

提出基于灰度共生矩阵(GLCM)和混沌遗传优化算法(CGA)的人脸表情识别方法(FER)。为了消除遗传算法中个体在解空间内分布的不均匀性,利用混沌的随机性、遍历性和规律性,将混沌引入到遗传算法中,由此得到了混沌遗传优化算法(CGA);通过灰度共生矩阵提取出的特征和改进后的混沌遗传优化算法,将人脸表情识别的寻找感兴趣区域(ROI)和特征提取结合成一步;利用Adaboost算法进行图像分类。经过理论和实验证明,该方法实现简单、切实可行。     

基于亮度检测检测和SVM的人脸表情识别算法

针对包含表情信息的静态图像,提出基于皮肤检测和SVM的人脸表情识别算法。首先根据先验知识,并使用皮肤检测和积分投影相结合定位眉毛眼睛区域和嘴巴区域,自动分割出表情子区域。接着,对分割出的表情子区域进行Gabor小波特征提取,在利用Fisher线性判别对特征进行降维,去除冗余和相关。最后利用支持向量机对人脸表情进行分类。用该算法在日本表情数据库上进行测试,获得了较高的识别准确率。证明了该算法的有效性。     

基于Gabor小波和SVM的人脸表情识别算法

针对包含表情信息的静态图像,提出基于Gabor小波和SVM的人脸表情识别算法。根据先验知识,并使用形态学和积分投影相结合定位眉毛眼睛区域,采用模板内计算均值定位嘴巴区域,自动分割出表情子区域。对分割出的表情子区域进行Gabor小波特征提取,在利用Fisher线性判别对特征进行降维,去除冗余和相关。利用支持向量机对人脸表情进行分类。用该算法在日本表情数据库上进行测试,获得了较高的识别准确率。证明了该算法的有效性。     

基于有监督的Laplacianfaces和局部二元模式的人脸表情识别

由于不能准确反映表情流行的内在结构等缺点,目前基于流行的表情识别方法的识别不高.针对此问题提出了基于有监督的Laplacianfaces(SLAP)和局部二元模式(LBP)的方法,简称LSLAP.SLAP的优点是保留局部结构的同时把类别信息加入到映射中,因此它得到的子空间中不同类别的样本可以被很好地区别开来;LBP在3种级别的区域上描述人脸具有判别力强、抗光线干扰和计算简便等优点.通过把人脸的LBP特征映射到由SLAP得到的低维空间以达到最终的特征提取,采用最近邻分类器进行分类.在JAFFE和Cohn Kanade人脸表情库上对该算法进行验证,实验结果表明:SLAP能够准确地反映表情流形的内在结构,与EigenfacesFisherfaces、Laplacianfaces以及它们各自应用于LBP的方法即Eigenfaces LBP,Fisherfaces LBP,Laplacianfaces LBP相比,LSLAP具有更高的识别率.     

基于改进的Adaboost_SVM的人脸表情识别

针对AdaBoost算法随着学习难度的增加导致分类器的分类效率下降、稳定性变差等问题,支持向量机在小样本中有特有优势;本文结合两种算法优势,基于蚁群算法对SVM的参数进行优化,改进了Adaboost_SVM级联分类算法,首先提取haar-like矩形特征通过Adaboost分类器快速排出非人脸区域;用Gabor小波变换提取人脸表情特征,再结合Adaboost_SVM级联分类器进行人脸表情识别。通过对JAFFE表情库进行试验,表情平均识别率达到94.2%,检测速度有了很大提高。     

多表情人脸肖像的自动生成

肖像是一种能够抓住人物特征,又能隐藏细节,保留个人隐私的艺术表现形式,本文提出一种以中性表情人脸作为输入,自动生成不同表情的肖像算法.首先利用主动形状模型(Active Shape Model,ASM)提取人脸的关键特征点,然后根据统计学习获取的不同表情人脸的FAP(Facial Animation Parameter)规则,对中性人脸的特征点进行变形,生成表情三角网格,将中性人脸图像作为纹理映射到表情人脸网格,生成表情人脸图像,最后利用图像的梯度域信息和非真实感渲染技术,将带表情的人脸生成具有肖像风格的人脸图像.所生成的多表情人脸肖像效果良好,能够应用于网络和报刊杂志等非真实感图形学和数字娱乐等领域中.     

基于MG-LTP与ELM的微表情识别

特征提取和表情分类是表情识别的关键技术。针对传统方法识别率低的缺点,首先,提出了一种基于平均灰度的局部三值模式(MG-LTP)新算法,用于提取表情特征;其次,使用极限学习机(ELM)作为分类器,用于特征分类;最后,将二者结合用于表情识别,并进一步应用于人脸微表情识别中。在JAFFE数据库及CASME人脸微表情数据库进行试验,与传统方法对比,取得了较好的效果。     

基于PCA特征提取和距离哈希K近邻分类的人脸表情识别

使用PCA降维,提取人脸表情特征,并结合基于距离的哈希K近邻分类算法进行人脸表情识别。首先使用类Haar特征和AdaBoost算法进行人脸检测,并对人脸图像进行预处理;接着使用PCA提取人脸表情特征,并将特征加入到哈希表;最后使用K近邻分类算法进行人脸表情的识别。将特征库重构为哈希表后,很大地提高了识别效率。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.