基于肤色和运动检测技术的单目视觉手势分割

在分析肤色的信息特征和手势的运动特性基础上,构建了一种基于单目视觉的手势分割方法,可从视频图像序列中获取有意义的手势区域.针对确定的背景图像,以10帧的采样间隔采集手势图像,通过肤色信息特征来获得手势的肤色区域,同时通过差分法获得手势的运动区域,再将肤色区域与运动区域进行融合处理获得初始的手势区域,在此基础上,进一步研...     

一种复杂背景下的手势提取方法

介绍了一种在一般复杂背景条件下将手势与背景分离的新方法.该方法首先在一般背景下对获得的手势图片进行卷积滤波处理,验证了肤色的聚类特性,然后综合利用手势的肤色特征和其特有的几何特征,成功地将手势与背景分离,最后通过不同背景、不同手势提取实验验证了该方法的有效性.将该手势分割方法用于8种于形手势识别实验,静态手势识别率能达到99%.     

基于傅立叶描述子-BP神经网络的手势识别方法

针对手势识别中人手是复杂变形体,手部特征描述容易受到环境因素影响的特点,提出了一种基于傅立叶描述子-BP神经网络的手势识别方法.首先根据YCbCr和Nrg肤色模型的互补性以及背景模型有效去除复杂背景中的类肤色的特点,利用多特征相融合的手势分割方法提取手势区域;然后结合傅立叶描述子具有较好的轮廓描述能力和BP神经网络较强的自学习能力,利用傅立叶描述子-BP神经网络方法对手势进行识别.实验结果表明此方法具有较好的鲁棒性和较高的识别率.     

复杂背景下基于肤色检测的动态手势分割与识别

在类肤色的复杂背景下,基于肤色检测的动态手势识别会因肤色干扰导致识别效率较低。提出了一种基于YCbCr颜色空间的改进三帧差分法的动态手势识别方法。首先利用改进的三帧差分法对动态手势进行分割,有效去除类肤色背景;然后根据人体肤色在YCbCr颜色空间中的聚类效果,采用基于椭圆模型的肤色检测方法有效去除非肤色背景,分割出手势区域。通过双特征提取,有效去除大范围的肤色背景,最终得到完整的手势;最后利用BP神经网络较强的自学习能力,对分割的动态手势进行检测识别。实验结果表明,此方法在应对环境变化时具有较好的实时性和抗干扰能力,拥有较高的识别率。     

基于肤色特征和卷积神经网络的手势识别方法

传统手势识别方法需要人工选取特征,选取的特征往往很难适应手势的多变性,从而极大地影响了手势的识别率;提出了一种基于肤色特征和卷积神经网络的手势识别方法;首先采用椭圆肤色模型对复杂背景下的手势样本进行分割,将分割出的手势区域进行二值化和归一化处理,然后构建了一种卷积神经网络对处理过的手势样本进行迭代训练,提取出各类手势关键的高维特征,进而得出手势识别模型;通过该方法训练出的手势模型能够自主地对给定的手势图像进行特征提取和手势分类;实验表明:该手势识别方法在测试集上具有较高的识别率;在现实场景的测试中,该方法也取得了良好的手势识别效果,且实时性和鲁棒性较好。     

基于高斯混和模型与Blob分析的人手定位

在基于机器视觉的手势识别研究中,手势分割与定位是关键技术。本文在分析肤色的颜色特征和人手运动特性的基础上,提出了一种在视频图像序列中实现手势分割和定位的算法。首先结合肤色检测技术和基于高斯混合模型的运动目标检测技术,获得了图像序列的初始手势区域,之后利用Blob技术实现了最终手势的分割和定位。实验结果显示,该方法具有较高的分割和定位准确度。     

基于栈式稀疏自编码多特征融合的快速手势识别方法

针对复杂背景下手势分割提取效果不佳、图像识别率不高、识别困难等问题,研究多特征融合的快速手势识别方法.利用YCbCr颜色空间模型,构建肤色分布模型,从复杂背景中去除大部分非肤色的干扰,从而实现手势分割;接着采用5层栈式稀疏自编码网络框架,分别提取手势感兴趣区域（region of interest,ROI）的纹理图像、形状图像和显著视觉图像作为自编码网络输入,将提取到的不同类型的特征进行线性融合;最后使用基于径向基核函数（radial basis function,RBF）的支持向量机（support vector machine,SVM）分类器进行融合特征数据分类,从而实现不同类型的手势识别.实验结果表明,相比其他手势识别方法,本文方法识别率较高,提取特征更具有代表性,平均识别率可达95.05%.      

多次投影算法在视频监控人脸检测中的应用

根据视频监控图像在时间上的连续性和空间上的继承性,利用连续三帧视频图像对称差分,找到运动区域,再结合人脸肤色的聚类特征确定出人脸候选区域,然后改进了利用投影的人脸定位算法,将单次投影发展为多次投影,并且结合人脸的几何特征,实现视频监控中复杂背景下的多人脸检测。实验表明,该算法复杂度小,准确率较高,对姿态、表情、背景等变化情况下人脸的检测均具有较好的鲁棒性。     

基于YCbCr颜色空间手势分割

手势作为一种非常重要的信息交互载体,包含着大量符合人类认知习惯的交互信息,针对光照变化、外界干扰等复杂背景环境对手势分割的影响,提出了一种基于YCbCr颜色空间的肤色检测方法进行手势分割.根据人体肤色在YCbCr颜色空间中的聚类效果,采用基于椭圆模型的肤色检测方法,首先对复杂背景环境下的类肤色区域进行分割,同时针对分割图像中可能存在非手势区域的问题,采用最大类间方法获取分割阈值,去除图像中非手势区域,获取较高质量的手势二值图像.实验结果表明,针对复杂的背景环境,该算法具有较强的鲁棒性,能实现较为高效的手势分割.     

一种实时手势跟踪中的线性预测方法

针对手势视频序列中由于手势快速运动导致跟踪失败的问题,提出一种基于mean shift的线性预测方法以实现图像序列中手势实时跟踪.该方法通过提取手势肤色HSV空间中的H分量建立目标模型对运动手势进行跟踪,并针对手势快速运动的情况利用线性预测方法对下一帧中手势的起始中心进行预测,同时更新手势的目标模型以适应光照等环境的变化.实验结果表明:在手势快速运动时该方法可对目标起始中心进行有效预测,提高手势跟踪的精确度.     

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.     

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