基于测地线采样的三维表情人脸识别

针对测地线类人脸识别算法速度慢的问题, 提出了一种基于测地线环带特征点采样的三维人脸识别方法。首先根据测地线距离以鼻尖点为中心在人脸表面绘制一系列等距测地线环; 再对测地线环带进行特征点采样构成人脸描述特征, 并进行PCA(Principal Component Analysis)运算和去相关处理; 最终使用投票法融合各环带单独结果以识别人脸。在FaceWareHouse 表情三维人脸数据集上进行的识别实验表明, 该方法识别准确率与传统测地线法相当, 而识别时间有明显减少, 平均识别时间由2. 55 s 降至0. 624 3 s。     

基于区域改进LBP的三维人脸识别

针对三维人脸识别中的表情问题,提出一种基于区域改进局部二值模式(LBP)的三维人脸识别算法.首先将预处理后的三维点云转化为深度图并进行归一化处理;然后根据表情对人脸的影响,利用二元掩膜提取人脸的刚性、半刚性和非刚性区域;对每个局部区域,计算其改进LBP特征,并用等价模式进行表征;最后使用稀疏表示分类器(SRC)对单个局部区域进行识别实验,并使用带权重的稀疏表示分类器(W-SRC)对刚性和半刚性区域进行决策级融合,给出最终识别结果.在FRGC v2.0人脸数据库上的实验结果表明,该方法具有较好的鲁棒性和较高的识别精度.     

三维人脸表情识别研究与进展

随着人机交互与情感计算的快速发展,人脸表情识别已经成为研究热点.二维人脸表情图像对于姿态变化与光照变化不具备鲁棒性,为了解决这些问题,研究者们使用三维人脸表情数据进行表情分析研究.本文在前人工作的基础上,对三维人脸表情识别中的对齐与跟踪、表情数据库、特征提取等方面进行综述.指出人脸表情识别的热点与趋势以及存在的局限,并对未来发展进行了展望.     

基于HMAX模型的仿生人脸识别算法

为了提高人脸识别效率,减小特征提取的时间消耗,本文提出一种基于改进HMAX模型的类脑识别算法,通过模拟生物视觉皮层的信息处理机制,构建了一个五层结构的分层网络用以提取目标图像的不变特征并进行识别.在S1层应用小波分解模拟视皮层V1简单细胞对目标图像进行滤波;在C1层进行特征提取,采用SVDP算法代替标准HMAX模型中的最大值操作,得到对光照、表情、姿态不变性的代表特征;最后,在VTU层对人脸图像进行分类.实验表明,改进后的算法在对样本进行识别时,能够有效降低特征提取的时间开销,同时也提升了识别效率.     

基于局部二元模式和重采样双向2DLDA的人脸识别算法

针对人脸识别中存在的小样本问题及光照变化、 表情变化等导致的识别问题, 提出一种基于局部二元模式和重采样双向2DLDA的人脸识别算法
LBP-RB2DLDA. AR人脸库的实验结果表明, 该算法具有较高的识别率和鲁棒性.     

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.     

基于混合Gauss模型的鲁棒性人脸识别算法

针对人脸图像受表情、光照、角度变化等因素影响,传统算法难以获得较理想的人脸识别结果问题,提出一种基于混合Gauss模型的鲁棒人脸识别算法.先将每副图像划分成子块,提取其方向梯度直方图特征,并加入子块相应的空间位置信息产生人脸图像的局部特征向量;再采用全部图像的局部特征向量训练混合Gauss模型生成人脸特征向量;最后采用最小二乘支持向量机建立人脸识别分类器,实现人脸匹配与识别.采用ORL,Yale和CIGIT人脸库进行仿真对比测试,仿真结果表明,该算法的人脸识别率高于其他人脸识别算法,对光照、角度、表情等有较强的鲁棒性,且可以获得更快的人脸识别速度.     

一种基于压缩感知的单样本人脸识别方法

针对人脸姿态、光照和表情等各方面原因引起人脸识别率不高的问题,提出了一种基于单样本特征点形变成冗余样本的压缩传感人脸识别方法.将人脸图像信号进行小波变换得到系数的稀疏表示,采用高斯随机测量矩阵进行测量得到离散人脸单样本,基于特征点形变人脸三维模型生成冗余样本,通过稀疏特征点正交匹配追踪非线性重建算法重建冗余图像进行人脸识别.仿真实验结果表明,所提出的算法相对于同类算法,时间复杂度较低、精确度较高、鲁棒性较强,且随复杂环境变化,其优势更明显.     

三维人脸识别研究进展综述

近年来,三维人脸识别研究取得了较大进展.相比二维人脸识别,三维人脸识别更具有优势,主要特点是在识别中利用了三维形状数据.该文首先根据三维形状数据的来源,将三维人脸识别分为基于彩色图像的三维人脸识别、基于高质量三维扫描数据的三维人脸识别、基于低质量RGB-D图像的三维人脸识别,分别阐述了各自具有代表性的方法及其优缺点;其...     

基于小波变换和支持向量机的人脸识别研究

人脸识别是机器视觉、模式识别等领域的研究热点,具有广阔的应用前景.文章利用小波变换对人脸图像进行预处理,减少表情变化对人脸识别的影响;根据PCA法,将处理后的人脸图像映射到相互正交的特征脸坐标轴上,实现了特征降维;利用支持向量机分类模型对人脸图像在特征脸坐标轴上的投影向量进行识别,并在ORL和Yale人脸库上进行实验,...     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-