共查询到19条相似文献,搜索用时 375 毫秒
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一种通用的基于基本语义单元的体育视频内容分析框架 总被引:1,自引:0,他引:1
体育视频内容分析的研究现状集中在语义标注,对体育视频的句法分段和框架的研究较少.本文在分析了体育视频基本特征的基础上,提出了体育视频中基本语义单元(Basic Semantic Unit,简称BSU单元)的概念;继而提出了一种基于BSU的体育视频内容分析的通用框架;并且以足球视频为例,实例化了这种通用的体育视频内容分析框架.初步的实验结果表明,这种基于BSU的体育视频内容分析框架是有效和可行的. 相似文献
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为了增强混杂Petri网模型描述能力和克服一阶混杂Petri网模型语义错误的问题,定义一种新的混杂Petri网模型——广义混杂Petri网,提出了相应的迁移使能和迁移引发语义.通过划分标识等价类提出了广义混杂Petri网连续迁移瞬时引发速率的有效求解方法和模型行为演变分析方法.给出了广义混杂Petri网模型的混杂系统建模实例,同时结合模型行为演变和线性规划实现了混杂系统的优化控制.研究结果表明,所定义的模型描述能力更强,模型语义正确合理.能够有效描述和分析混杂系统. 相似文献
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UML2.0顺序图的形式化研究 总被引:1,自引:0,他引:1
在UML2.0规范中顺序图的语义仍然是以自然语言的形式描述的,为实现对顺序图的自动化分析和验证,必须为顺序图定义一种形式化的语义模型.为此首先给出了UML顺序图的一种符合BNF范式的形式化语法,然后为该语法中的非终止符定义转换规则,将UML顺序图中的基本动作转换为加标Petri网组件,最后定义了各种合成操作,利用这些合成操作可以将UML顺序图的加标Petri网组件转换为加标Petni网. 相似文献
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基于Petri网的工作流模型 总被引:7,自引:4,他引:7
Petri网是一种很有效的模型描述语言,不仅能描述系统的结构特性,同时还能描述其动态特性,尤其适用于描述含有并行成分的系统,而工作流技术作为实现企业过程集成的有效手段,广泛用于各种场合。在简要介绍了Petri网和工作流基本知识的基础上,指出了基于Petri网的工作流模型的优点,讨论了将工作流模型转化为Petri网模型的基本原则,并且提出了一种扩展的Petri网模型作为一种工作流建模的工具,最后对基于Petri网的工作流模型进行了总结。 相似文献
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分析了用一般Petri网进行Web服务合成建模的不足,提出用有色Petri网进行改进.利用有色Petri网原理给出了Web服务的形式化定义,描述了Web服务合成的五种基本结构的Petri网模型,通过一个行程规划实例,分析了行程中的不同Web服务,描述了行程规划服务由不同Web服务合成的有色Petri网模型,展示了有色Petri网在Web服务合成建模中的优势. 相似文献
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基于Petri网合成与化简的分布式数据库系统并发控制的死锁检测 总被引:5,自引:0,他引:5
利用模块化设计的思想,首先为分布式数据库系统中各事务的每一种操作(读锁、写锁、解锁)构造一个基本的加权Petri网模型,并给出了加权Petri网共享合成的概念、然后利用共享合成技术,动态地构造各站点的加权Petri网模型,以适应系统的动态变化.此外,本文利用Petri网的化简技术,极大地简化了各站点的Petri网模型,之后利用同步合成技术构造出整个系统的Petri网模型,较好地解决了Petri网的可达性分析中可能出现的状态“爆炸”问题.最后给出了判断整个系统是否出现死锁的充分必要条件. 相似文献
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Automatic annotation of semantic events allows effective retrieval of video content. In this work, we present solutions for highlights detection in sports videos. The proposed approach exploits the typical structure of a wide class of sports videos, namely those related to sports which are played in delimited venues with playfields of well known geometry, like soccer, basketball, swimming, track and field disciplines, and so on. For these sports, a modeling scheme based on a limited set of visual cues and on finite state machines that encode the temporal evolution of highlights is presented, that is of general applicability to this class of sports. Visual cues encode position and speed information coming from the camera and from the object/athletes that are present in the scene, and are estimated automatically from the video stream. Algorithms for model checking and for visual cues estimation are discussed, as well as applications of the representation to different sport domains. 相似文献
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《Multimedia, IEEE Transactions on》2008,10(7):1342-1355
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Automatic annotation of semantic events allows effective retrieval of video content. In this work, we present solutions for highlights detection in sports videos. This application is particularly interesting for broadcasters, since they extensively use manual annotation to select interesting highlights that are edited to create new programmes. The proposed approach exploits the typical structure of a wide class of sports videos, namely, those related to sports which are played in delimited venues with playfields of well known geometry, like soccer, basketball, swimming, track and field disciplines, and so on. For this class of sports, a modeling scheme based on a limited set of visual cues and on finite state machines (FSM) that encode the temporal evolution of highlights is presented. Algorithms for model checking and for visual cues estimation are discussed, as well as applications of the representation to different sport domains. 相似文献
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Maheshkumar H. Kolekar 《Multimedia Tools and Applications》2011,54(1):27-54
This paper presents a probabilistic Bayesian belief network (BBN) method for automatic indexing of excitement clips of sports
video sequences. The excitement clips from sports video sequences are extracted using audio features. The excitement clips
are comprised of multiple subclips corresponding to the events such as replay, field-view, close-ups of players, close-ups
of referees/umpires, spectators, players’ gathering. The events are detected and classified using a hierarchical classification
scheme. The BBN based on observed events is used to assign semantic concept-labels to the excitement clips, such as goals,
saves, and card in soccer video, wicket and hit in cricket video sequences. The BBN based indexing results are compared with
our previously proposed event-association based approach and found BBN is better than the event-association based approach.
The proposed scheme provides a generalizable method for linking low-level video features with high-level semantic concepts.
The generic nature of the proposed approach in the sports domain is validated by demonstrating successful indexing of soccer
and cricket video excitement clips. The proposed scheme offers a general approach to the automatic tagging of large scale
multimedia content with rich semantics. The collection of labeled excitement clips provide a video summary for highlight browsing,
video skimming, indexing and retrieval. 相似文献
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由于多媒体数据库管理和检索的效率直接决定了人们利用多媒体数据信息的效率,因此随着MPEG-7标准的提出,基于内容的图象/视频存储和检索已成为研究的热点.为了快速地对视频进行浏览和检索,在研究基于内容的视频数据库管理和检索等热点问题的基础上,首先使用MPEG-7视觉内容描述子和语义描述子来构建视频数据库的语义结构,并结合底层视觉特征和高层语义特征,采用相关反馈机制和半自动权重更新体制来对视频数据库进行管理和检索;然后采用语法分析器来支持自然语言查询;最后在此基础上实现了基于内容的视频数据库的管理和查询系统.实验证明,该系统能够有效地对视频数据进行管理和检索,并且具有一定的智能性和适应性. 相似文献
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设计和实现一个支持语义的分布式视频检索系统:"语寻"。该系统利用一个改进的视频语义处理工具(该工具基于IBM VideoAnnEx标注工具,并增加镜头语义图标注和自然语言处理的功能)对视频进行语义分析和标注,生成包含语义信息的MPEG-7描述文件,然后对视频的MPEG-7描述文件建立分布式索引,并同时分布式存储视频文件;系统提供丰富的Web查询接口,包括关键字语义扩展查询,语义图查询以及自然语句查询,当用户提交语义查询意图后,便能够迅速地检索到感兴趣的视频和片段,并且可以浏览点播;整个系统采用分布式架构,具备良好的可扩展性,并能够支持海量视频信息的索引和检索。 相似文献
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HMM模型具有良好的适应性,可以自动学习,对预测随机时序数据性能良好。场景是足球视频的基本特征,场景的转换体现了足球视频的摄制、编辑模式,表现了足球视频的语义。提出了一种基于场景分析和HMM的视频语义分析框架,用于识别足球视频中的一些语义事件。为了克服以往基于主颜色和其他底层特征的视频场景分析中存在的较大误差,又提出基于视觉注意模型对足球视频中的场景进行分析。实验结果表明,基于场景分析和HMM的事件识别方法对足球视频中的任意球事件有良好的识别效果 相似文献
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The purpose of this article is to analyze current vision-based systems from a soccer video semantic point of view such as video summarization, features analysis, and provision of augmented information. Currently, computer vision techniques are applicable in a challenging soccer context. Scene interpretation is performed based on the complexity of the semantic. For each area of vision-based systems, computer vision methodologies are analyzed along with their strengths and weaknesses. We have also investigated whether the existing approaches are equally applicable for real-time soccer video semantic analysis. 相似文献
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