视频语义信息提取的研究

由于视频信息信息量大,内容丰富,使得对其进行有效的管理和检索成为一个困难而又必须解决的课题.在对视频分割算法进行研究的同时,提出一种基于语义的视频镜头检测方法.主要是通过相邻帧之间的差异来判断是否存在镜头切换出现.实验验证该方法是可行的.     

基于包含度理论的双阈值视频镜头边界检测算法

在视频镜头边界检测中,由于人眼视觉具备的主观性和视频帧图像结构与边界的不确定性,比较适合采用模糊理论,本文基于模糊集中的包含度理论提出双阈值化的视频镜头边界检测方法：首先基于包含度公式定义视频镜头边界检测函数,然后利用包含度理论提出视频边界镜头渐变和突变的通用检测算法,最后提出双阈值优化选取办法,实验结果表明本文方法具有较好的检测渐变和突变镜头能力。     

基于图像熵的全局和局部混合方法的关键帧提取

为了能快速识别视频内容并解决现有视频识别中关键帧冗余问题,提出了一种利用熵值进行关键帧提取的新方法。该方法先利用全局图像熵值对镜头进行分类,从每个类中选择具有代表性的关键帧,然后再使用图像局部特征的熵值剔除已选择的冗余帧。对几个不同类别视频的关键帧提取实验显示,提出的算法在关键帧准确率、冗余帧等指标上有很大改善,很大程度上解决了提出的问题。该算法能以更快的方式处理大量的视频数据,使电脑能自动提取视频关键帧,从而识别视频内容。     

基于DCT系数统计特征的镜头突变实验算法

镜头检测是对视频进行分析和检索的基础,提出了一种在压缩域中基于统计参数的镜头突变实验算法,通过离散余弦变换(discrete cosine transform,DCT)计算视频帧的数学期望和方差,建立累加直方图,利用相关性判定视频帧的差异,以此决定是否发生镜头突变。实验结果显示,此种方法通过统计原理表征视频的特征,不受视频光照、明暗度等影响,检测精度高,速度快,易于实现。     

基于帧间差分与背景消减的视频摘要算法研究

为克服帧间差分法只适合于帧像素变化较大的视频检测及背景消减法只适合于固定背景模型的视频检测的缺点,提出一种新的基于帧间差分与背景消减的视频摘要算法,这种算法首先对前后两帧的帧图像像素进行检测,若无显著运动对象,则继续进行背景模型对比检测.实验结果表明,该算法能够快速、精准地对运动显著及不显著的视频进行摘要提取,浓缩事件精华,较高地还原视频关键信息内容.     

基于MPEG-2非编系统精确到帧编辑的实现

MPEG-2的视频数据有自身的技术规范,基于MPEG-2的非线性编辑系统要实现精确到帧的编辑,必须采取相适应的算法来实现。本文从MPEG-2的技术层面入手,分析了精确到帧编辑的含义,并在一个具体的算法基础上重点对编辑过程中用得最常见的删除、插入操作的具体实现进行了分析。     

基于互信息量的视频关键帧提取算法

关键帧提取技术是基于内容检索和视频分析的基础。关键帧的使用减少了视频索引的数据量,同时也为视频摘要和检索提供了一个组织框架。首先介绍了目前关键帧提取技术,然后提出了一种基于互信息量的关键帧提取方法,该算法以帧间互信息量来衡量两帧图像内容的相似性,可以对具体镜头按其特点自动提取出一个或多个关键帧。实验结果表明这种方法可以较好地概括视频内容。     

基于内容的视频检索技术研究

一般采用视频浓缩技术来存储海量的监控视频数据,然而要实现快速检索视频中的重要事件较为困难.为此介绍基于内容的视频检索概念,提出基于视频镜头内容与确定的帧从视频中提取关键帧的方法,探讨与研究模板匹配法、直方图法、边缘测试法等从关键帧中检索基于内容的算法.     

基于帧间一致光源颜色估计的视频白平衡方法

针对视频白平衡中产生的画面颜色不稳定问题,提出了基于帧间一致光源颜色估计的视频白平衡方法。首先利用同一消色差物体表面颜色不变的性质,检测视频帧图像中反映光源颜色的灰点,获得单帧图像光源颜色估计。然后对相邻帧光源颜色估计结果进行自适应融合,得到帧间一致的光源颜色估计结果,并进行白平衡处理。通过帧间光源颜色的一致性,达到了画面颜色稳定的视频白平衡效果。实验结果表明,所提方法在保持了视频白平衡结果基本正确的同时,有效提高了视频白平衡结果的颜色稳定性。     

视频检索中一种改进的镜头分割方法

提出了一种视频分割方法。该方法是在互信息量的基础上,先设一个大窗口并对该窗口中视频帧进行初步的分析,得出候选切变帧,然后再以候选切变帧为中心设一个奇数小窗口,通过候选切变帧亮度值和小窗口的平均亮度值相除大于阈值就可认定为切变帧。该算法可以有效地防止闪光引起的干扰。实验表明,该方法在镜头分割的查全率和查准率方面都有所提高。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.