基于支持向量机的小波域视频字幕检测与提取

视频流里的文本字幕包含了丰富的语义信息,对于视频内容的理解、索引和检索具有重要的作用.文中首先对视频图像进行分割,提取它们在小波变换域中的统计特征,然后用支持向量机(SVM)分类器对这些特征进行分类,实现了字幕的自动检测与提取.仿真结果表明该方法具有较好的适用性.     

基于多模注意力机制的密集型视频描述

为了解决密集型视频描述(dense video captioning, DVC)任务中视频特征利用不充分，视频定位分段不准确，语义描述效果不丰富的问题，采用多模注意力机制的密集型视频描述方法，提取视频中的视觉特征、音频特征和语音特征.通过多模注意力机制，在编码器中计算不同模态视频帧特征间的关联程度，在解码器中计算描述词序列特征与编码器输出的多模态视频帧特征间的关联程度，并将编码器、解码器输出特征分别作用于视频定位分段模型和语义描述模型获得视频分段和分段描述.提出的方法在ActivityNet Captions数据集上进行了理论分析和实验验证，其中F1-score达到60.09,METEOR指标达到8.78.该方法有效提高了视频定位分段和语义描述的准确性.     

视频字幕提取技术在广电监测中的应用

视频中的字幕是内容的高度概括,尤其是新闻视频,更能彰显字幕在视频内容检索和监测方面的作用。分析新闻视频字幕的特点,研究视频字幕提取的关键技术。针对广电内容监测,设计新闻视频字幕提取的有关算法,实现仿真分析。结合监测的实际情况,选取不同的新闻视频进行测试分析,验证了视频字幕提取技术在广电监测方面的应用。     

面向多源异构数据的跨模态存储与检索系统

制造业在设计、生产、销售和服务环节中产生了文本、图像、音视频等海量多源异构数据，高效地管理与利用这些数据资源为制造业再生产创造价值是当前制造企业面临的重大难题.传统的数据存储与检索系统将多模态数据按不同形式或模态进行分类并单独处理，导致不同模态的数据之间缺乏语义关联（文本、图像、音视频数据之间无法互检），无法支持制造企业的设计、服务等业务流程的智能化.设计并实现了一种面向文本、图片等多源异构数据的跨模态存储与检索系统，实现智能制造多源异构数据的高效管理与检索.具体地，该系统将制造企业生产运营过程中产生的多源异构数据投影到统一的高维语义空间进行表示产生语义向量，并按不同的查询需求将数据存储到不同的模式中；其次，该系统设计了三级结构+分层联通朴素构图算法的高效检索方法，将多源异构数据按照语义向量进行索引，以满足制造业用户的语义查询需求.在flickr30k数据集上进行了实验，实验结果表明：（1）该系统可支持百万级别的跨模态数据存储与检索；（2）百万级别数据下系统检索速率为毫秒级；（3）检索的正确率比现有的向量检索方法更高.     

一种改进的基于Web的新闻视频内容语义分析方法

视频内容安全分析是多媒体内容安全的重要研究领域和热点问题.该文针对视频ASR识别精度不高的问题,提出一种改进的基于Web的新闻视频内容语义分析方法.该方法根据脚本在语音上的相似性来优化语义关键词,然后利用Web获得较为准确的新闻视频内容语义.通过对TRECVID2005内中文新闻视频CCTV4-NEWS进行的实验表明,提出的方法是可行的.     

基于支持向量机语义分类的两种图像检索方法

为了更好的解决基于内容的图像检索问题,提出了2种基于语义的图像检索方法.第1种是基于支持向量机(SVM)语义分类的图像检索方法.该方法首先提取训练图像库的底层特征信息,然后利用SVM对所提取的特征进行训练,构造多分类器.在此基础上,利用分类器对测试图像自动分类,得到图像属于各个类别的概率,实现图像检索.第2种是利用图像自动标注方法进行检索.在基于语义的图像自动标注中,先对训练集进行人工标注,对测试图像利用SVM分类器进行分类,并找到与该图像最相似的N张构成图像集,对该图像集的标注进行统计,找到关键词,从而提供概念化的图像标注以用于检索.通过在标准图像检索库和自建图像库上的实验结果表明,以上2种基于语义的图像检索方法是高效的.     

基于内容的大规模图像检索基本方法

基于内容的图像检索方法是利用互联网上大量的图像信息,以计算机视觉、信息检索、统计学习等理论为基础,发展图像内容的提取和检索技术。本文主要针对提取的显著点和特征缺乏语义信息的问题,提出将显著点和SVM相关反馈结合的图像检索方法。     

小波—神经网络在视频文本自动检测中的应用

数字视频数据中的文本能提供重要的语义信息,用具有良好时频局部特性和变尺度特征的小波分析方法,提取图像中的尺度－空域特征,经神经网络分类进行分类后,自动检测视频数据中的文本信息,为基于内容的视频检索提供索引,实验表明该检测方法效果良好。     

基于支持向量机的视频语义场景分割算法研究

针对视频分割中存在的低层特征与高层语义之间“语义鸿沟”问题,在对视频进行镜头边界检测的基础上,引入视频语义概念矢量的定义,实现了一种基于支持向量机的视频语义场景构造方法。根据镜头关键帧画面语义的不同,提取镜头关键帧的颜色特征,并将其归一化;然后利用支持向量机对归一化后的特征量进行语义分类预测,从而生成语义矢量;将生成的语义矢量应用于已有的重叠镜头链方法,对镜头关键帧进行聚类,按语义差别构造出不同场景。实验结果证明了该方法的有效性。     

教育教学视频搜索引擎架构及其关键技术研究

基于视频关键字的传统检索方法不能满足学习者检索特定学习内容的检索需求.通过分析教学课录视频资源的特征、结构以及资源的使用特点,规范教学课录视频资源制作标准,采用相关技术对视频资源进行预处理以及建立教学语义本体等一系列操作和处理,在此基础构架教学课录视频搜索引擎,实现教学课录视频资源的检索和利用,提高资源的共享率和利用率,帮助师范生或一线教师提高教育教学的能力.并且基于"首都师范大学基础教育课程点评平台"案例分析和阐述视频搜索引擎架构中的关键技术.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~