基于颜色加权的新闻视频镜头检测方法

针对新闻视频镜头切变时颜色特征的变化, 提出了一种基于颜色直方图加权的方法, 即采用加权颜色直方图作为特征求相邻两帧的帧间差, 并与自适应阈值进行比较, 确定潜在的镜头边界。同时针对新闻视频中经常出现的闪光灯现象对镜头检测的影响, 采用改进的滑动窗口法进行二次检验, 进一步确定镜头边界, 有效减少了视频中物体运动过快对镜头边界检测的影响。实验结果表明, 该方法与传统方法相比, 其检测效果较好, 且计算复杂度低, 易于实现。     

一种新的自适应镜头边界检测算法

针对镜头边界检测中存在的检测效果和检测阈值依赖人工经验的问题,提出了一种新的自适应镜头边界检测算法.该算法以视频帧窗口中亮度帧差到帧差均值的距离作为切变检测特征,根据该距离值的变化程度自动选取切变最优化阈值;以视频帧序列中的颜色帧差为渐变检测特征,对该帧差进行数量级量化,直接利用量化结果判定渐变,实现了镜头检测的自适应.实验结果表明,该算法对切变的查准率和查全率分别为96.74%和97.41%,对渐变的查准率和查全率分别为92.34%和89.67%,对于不同类型的视频检测效果稳定.     

内容的新闻视频的切变镜头检测算法

为解决新闻视频组织和检索中对新闻视频进行基于内容分割的问题,提出了一种新的镜头分割方法。该方法利用相邻帧之间特征值之差初步判定镜头的切变位置,其特征值差阈值能自适应调整并对潜在的镜头切变位置进行闪光检测。试验结果表明,该算法能快速、准确地检测出新闻视频中的切变镜头。其中查全率和查准率平均能达到94%和89%,较原来方法都有所提高。     

基于DirectShow的镜头检测系统

镜头检测是视频检索中最基本也是最重要的一项内容,在讨论了如何利用DirectShow获取视频单帧图像的基础上,采用“滑动”窗口法来实现镜头的切变与渐变的检测,实现了基于DirectShow的镜头检测系统．实验结果表明,系统对镜头切变的检测取得了良好的效果,同时,也可以对滑动、淡入淡出、擦除等渐变进行检测．系统采用了DirectShow作为对视频的支持,具有良好的通用性及人机交互界面,满足了视频检索系统对界面的要求．     

基于时域局部线性预测的视频镜头变换检测

提出了通过时域局部线性预测，在统一框架中准确、高效地检测视频镜头的切变和叠化等镜头变换的新方法．通过理论分析和基于视频数据的线性回归，分别得到叠化预测模式和平稳镜头预测模式．通过同时比较分析两个线性预测模式的误差，在统一框架中检测切变和叠化变换．由于直接在视频流压缩域中进行分析，因此节省了视频解码的时间．采用新方法检测时仅需要对整数进行加、减、比较和移位操作，计算复杂度很低，适合在低功耗、嵌入式设备上运行．采用MPEG-7标准测试视频的实验结果显示：切变检测查全率为95．5％，查准率为93．9%；叠化变换检测查全率为82．2%，查准率为76．0％．检测一段38min的视频耗时仅3．5s．     

基于多特征融合和小波去噪的镜头渐变检测方法

镜头检测在视频检索中起着关键的作用。镜头渐变检测已有许多成熟的方法,如何识别镜头渐变是视频分割中的重点。将视频的多帧差序列视为一维信号,提出了一种基于多特征融合和小波去噪的二次帧差滑动窗口镜头边界检测算法,该方法能同时检测出镜头的切变和渐变,实验表明该方法在一定程度上克服了由于摄像机不规则运动、光影变化、画面中物体快速运动等造成的影响,通过对不同视频片段的测试和比较,表明该算法能较好地实现镜头的突变和渐变检测。     

一种基于机器学习的视频镜头边界检测方法

镜头边界检测是基于内容视频检索中的第一步,在视频分析中扮演着重要角色。在此基于统一的机器学习框架,提出一种新颖的模式分类方法来解决新闻和广告视频中镜头检测问题。该方法利用支持向量机将镜头分为无场景变化、切变以及大场景变化;在大场景变化中,进行快速运动和渐变的分类。同时研究了以往同类工作中所忽视的不平衡样本分类问题。实验结果表明该方法能有效检测出新闻和广告视频中的镜头转换。     

基于多特征融合和小波去噪的镜头渐变检测方法

镜头检测在视频检索中起着关键的作用.镜头渐变检测已有许多成熟的方法,如何识别镜头渐变是视频分割中的重点.将视频的多帧差序列视为一维信号,提出了一种基于多特征融合和小波去噪的二次帧差滑动窗口镜头边界检测算法,该方法能同时检测出镜头的切变和渐变,实验表明该方法在一定程度上克服了由于摄像机不规则运动、光影变化、画面中物体快速运动等造成的影响,通过对不同视频片段的测试和比较,表明该算法能较好地实现镜头的突变和渐变检测.     

基于双重检测模型的视频镜头分割算法

提出一种基于自适应双重检测模型的视频镜头分割算法.该算法分为初检和复检两阶段,初检提出了基于人类视觉特征的非均匀分块的概念,并结合滑动窗口自适应二分查找算法进行镜头边界检测;复检过程利用尺度不变特征变换算法对初检得到的镜头边界进行匹配,排除初检中的误检.视频测试结果表明,该算法对多种不同类型的视频能同时提高切变和渐变镜头边界检测的效果.     

基于SVM的视频中闪光灯的检测方法

在分析大量实验数据基础上,比较镜头切变、字幕突现或消失、光照突变等与闪光灯具有类似特征的情况后,提出了构造符号特征值的方法.符号特征值能够使得闪光灯与其他类似情况的区别更明显.在符号特征值的基础上提出了构造基于SVM的闪光灯检测器的方法,该检测器在实验中表现良好.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has