基于内容的视频多模式检索方法

在视频数据的检索方法方面,采用单一媒体的处理技术比较多,基于视频数据所表现的内容语义进行检索的提案很少,而且能够将视频数据与其相关的其他形式的数据整合并高效利用,保障视频数据在安全、高效的网络下进行多模式检索的研究也不多见。在检索方法上从解决这个问题入手,提出了多模式的视频特征提取与检索方法。该方法从视频语义特征的角度构建视频数据的语义特征库,将与视频语义相关的声音、字幕、音乐、剧情脚本、新闻文稿等信息特征进行整合,以人像、字幕、语音、视频镜头识别和剧情脚本分析的组合技术,利用语音相关性测定、选择字幕帧,边缘提取、字幕区域二值化和小波包分解、核函数技术等方法从语音、视频中提取语义特征,建立视频数据语义特征的多模式提取和检索模型。     

基于ICA算法的视频字幕检测与定位

研究了独立成分分析法(ICA)在视频序列处理中的应用,提出了一种新的基于ICA算法的视频字幕检测与定位方法,该算法采用了小波变换来提取独立分量.仿真实验结果表明,与传统方法相比,该方法能够有效消除背景信息,提高字幕定位的精度,具有更强的鲁棒性.     

视频信号中实时字幕信息的提取方法

为了在视频图像中进行字幕信息的实时提取 ,提出了一套简捷而有效的方法。利用视频图像中文本的频率特性与空间连续性 ,采用改进的投影阈值分割方法对视频中的文本进行实时分割。针对视频字幕在时间上的冗余特性 ,提出了一个基于有限状态机的动态缓冲的模型 ,在提高分割的正确率的同时减小了识别运算量。在识别部分 ,采用了一个 3层前向神经网络进行实时的识别。该算法已经成功地应用于卡拉 OK MTV歌词字幕信息同步提取系统中。     

一种基于遗传神经网络的医学图像分割方法

针对一类具有纹理特征的医学图像,提出一种结合纹理信息,利用遗传神经网络的图像分割方法。该方法以混合递阶遗传算法优化径向基神经网络,同时优化其结构及参数。试验表明,该方法应用于生物医学图像,能够区分图像不同的纹理区域,获得较好的分割效果。     

基于MRI的肝硬化程度的计算机辅助诊断

提出了将肝脏纹理特征与形状特征相结合以实现计算机辅助诊断肝硬化程度的新方法.首先利用图像分割技术从腹部MRI中分割肝脏区域,并提取肝脏区域的纹理特征与形状特征;然后用共轭梯度算法改进BP神经网络,基于该网络与纹理特征计算肝脏纤维化的程度,并利用形状特征计算肝左叶钝化的程度;最后结合肝脏纤维化程度与肝左叶钝化程度进行肝硬化程度的诊断.将该方法应用于实际的腹部MRI图像,证明了其对肝硬化程度诊断的准确率显著高于单一神经网络的方法.     

基于纹理及小波分析的车牌定位方法

提出了一种基于纹理和小波分析的车牌定位方法。针对图像背景复杂，且车牌所占比例较小的特点，提出了一种确定基元分类阈值的二值化方法；根据车牌字符分布规律，提出了二值纹理基元分析方法，提取车牌候选区域；基于小波分析提取车牌区域竖笔画特征，采用隶属度定量表征车牌竖笔画特征、位置特征及形状特征，给出综合这些特征、从候选区域提取车牌区域的方法。测试结果表明，该方法正确定位率超过96%     

一种应用于光照变化场景的视频编码方法

为提高存在光照变化场景的视频的编码效率,提出一种基于局部亮度补偿的视频编码方法.该方法先计算当前块和匹配块的空间邻近Γ型区域的平均亮度差异,然后用该亮度差异对匹配块进行亮度补偿,进而提高预测精度,最后计算差值信号并对差值信号进行编码.此外,为消除局部亮度变化对运动估计的影响,采用纹理匹配准则进行运动估计,提高运动估计所得的匹配块与当前块的纹理相似度.与H.264标准采用的加权预测方法相比,该方法可以对图像中不同的区域采用不同的参数进行亮度补偿,因此可以进一步提高编码效率.实验结果表明,在恢复视频质量相同的条件下,该方法的编码比特率较H.264标准采用的加权预测方法的编码比特率平均下降了2.34%.     

基于行扫描的车牌定位算法

车牌定位是车牌识别中的关键步骤。针对车牌区域内字符串具有丰富的纹理特征,本文提出了一种基于行扫描的车牌定位算法。该方法根据车牌纹理特征采用行扫描的方法确定出水平区域,再利用车牌的长宽比在水平区域内确定出左右边界。实验结果表明,此方法能比较准确的定位车牌,便于进一步的车牌分割识别。     

基于视频片段的视频检索

为提高视频检索的查询效率,提出一种基于视频片段的视频检索方法。该方法利用相邻帧之间的HIS(Hue,Saturation,Intensity)颜色信息特征将视频流分割成子片段,并采用高维索引结构Vector-Approximation Trie(VA-Trie)来组织视频子片段,然后,利用空间和纹理特征定义视频片段的相似度模型,在此基础上采用基于限定性滑动窗口的高效视频检索算法进行视频片段检索。研究结果表明:与其他检索方法相比,该方法能有效地提高视频检索的查全率和查询率,适合用于运动视频检索。     

基于特征融合的视频异常事件检测方法

为有效对视频数据进行降维并去除特征集合中的冗余信息, 以提高异常事件的检测效率, 从特征提取和选择的角度提出了融合特征区分度和相关性的视频异常事件检测方法。利用视频数据的时空邻域信息进行特征提取。通过分析特征的判别力和相关性进行特征选择, 从而去除特征集合中的冗余信息, 提高异常事件检测的效率和准确性。实验结果表明, 该方法的检测准确率都优于其他传统方法, 能有效地对场景中发生异常事件的区域进行准确定位。     

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.     

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     

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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