一种改进的自动分割镜头的方法

对现有传统分割算法进行分析，提出了一种改进的自动分割镜头的算法．通过计算视频序列相邻帧之间的灰度差值及色彩差异，自适应进行视频镜头的边界检测和闪光检测．这种算法将帧差法和直方图法这两种传统算法相结合，有效地提高了检出率及精确率，是一种简便、快捷的算法．     

基于字符串匹配和直方图分析的视频镜头检测算法研究

首先介绍了现有典型切变检测算法,然后提出一种改进的镜头切变检测算法,在字符串匹配算法的基础上用直方图法来进行二次检测.实验显示,这种方法解决了单独用字符串匹配算法造成的误检问题,取得了较好的镜头切变检测效果.     

基于灰度和直方图的阈值自适应镜头边界检测

镜头是对视频内容进行分析和检索的基础,研究镜头边界检测具有重要的现实意义。在对视频以及视频镜头边界检测的现有方法分析后,提出了一种改进的镜头边界检测算法——基于灰度和直方图的阈值自适应镜头边界检测算法。该算法是在应用自适应阚值的基础上,结合灰度图和直方图的特征总结出来的。实验结果表明这种改进的算法具有很好的突变镜头边界检测效果,同时该算法还对不同性质的视频有很好的适用性。     

一种改进的基于互信息量的镜头边界检测算法

镜头边界检测是基于内容视频检索的基础环节。由于视频类型与内容众多,目前镜头边界检测中存在阈值选取困难、查全率和查准率不高等问题。针对以上问题提出一种改进的基于互信息量的镜头边界检测算法,在字幕检测定位算法有效定位字幕区域的基础上,通过比较非字幕、非四角区域HSV空间直方图求取的相邻帧间互信息量的差异程度,实现镜头边界检测。实验表明,与当前应用最广泛且比较有效的双阈值算法相比,突变镜头检测综合性能平均提高12.4%,渐变镜头检测综合性能平均提高8.2%,通过自适应阈值的选取,有效解决了阈值依赖人工经验选取的问题;与当前已提出的基于互信息量的镜头边界检测算法相比,该算法降低了计算复杂度、几乎能检测所有的淡入淡出镜头边界,并使得镜头边界检测具有较高的查全率与查准率。     

一种基于镜头切换和文本检测的广告检测算法

针对广告的两个基本特征： 镜头切换较频繁和经常突显商标信息, 提出一种基于镜头切换和文本检测的广告检测算法. 该算法先对各相邻帧进行直方图差分, 再对剪切、 消融、 淡入淡出和划变4种常见的镜头切换方式进行分析和识别, 实现了镜头切换检测. 对于镜头切换频率较低的广告, 通过基于最大梯度差分的文本检测方法检测广告商标信息, 实现了广告自动检测系统. 实验结果表明, 对于约15 min的视频序列, 该检测算法可获得83.32%的正确率, 可初步满足广告检测的要求.     

基于纹理和直方图特征相融合的镜头边界检测方法

镜头切换检测是视频检索研究领域中一项基本的、重要的技术,对于数字视频镜头突变切换的检测,一般有模板匹配法、直方图法等基本算法,但这些算法在实际检测中通常达不到较高的检测精度。因此,提出了一种特征融合的镜头边界检测方法。HSV色彩直方图进行镜头边界检测是一种常用、有效的方法,该文通过小波变换得到视频帧的纹理特征,并将其与色彩直方图特征相融合,采用滑动窗口技术对视频镜头进行检测。实验表明,该方法能够有效地检测镜头突变,对镜头的渐变也能有较好地检测。     

基于纹理和直方图特征相融合的镜头边界检测方法

镜头切换检测是视频检索研究领域中一项基本的、重要的技术,对于数字视频镜头突变切换的检测,一般有模板匹配法、直方图法等基本算法,但这些算法在实际检测中通常达不到较高的检测精度。因此,提出了一种特征融合的镜头边界检测方法。HSV色彩直方图进行镜头边界检测是一种常用、有效的方法,该文通过小波变换得到视频帧的纹理特征,并将其与色彩直方图特征相融合,采用滑动窗口技术对视频镜头进行检测。实验表明,该方法能够有效地检测镜头突变,对镜头的渐变也能有较好地检测。     

增强现实中的多层次遮挡算法

提出了一种改进的基于几何立体匹配的遮挡检测算法来提高增强现实系统中虚实遮挡检测的实时性、精度和鲁棒性．通过立体图像对中虚实点的投影位置关系判断虚实点之间的遮挡关系,不需要进行深度计算,能够有效提高遮挡检测的速度;通过选择网格边界上特征明显的边点进行检测运算能够提高遮挡检测精度;根据显示状态的连续性,提出一种状态拟合模型来改善算法的鲁棒性．实验结果证明此遮挡算法可以实现虚实物体间快速、可靠的多层次遮挡检测．     

基于时空切片的新闻主播检测算法

为实现海量新闻视频的有效索引和检索,提出了一种基于时空切片（spatio—temprol slice,STS）特性的新闻主播检测方法．通过对时空切片的模式分析,聚类和信息融合,实现了新闻主播镜头的自动检测．该方法完全通过对新闻视频结构的分析,利用其共有的特性,对不同的新闻视频实现主播镜头自适应检测．大规模实验证明了该算法准确性高,鲁棒性强且计算复杂度低．     

基于关键帧提取的视频分割方法

从分析视频数据的结构和特点出发, 提出一种新的关键帧提取方法, 在此基础上首次利用线性回归法来检测镜头边缘. 实验证明, 该算法明显提高了视频分割的准确性.     

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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