共查询到19条相似文献，搜索用时 484 毫秒
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基于内容的图像信息检索综述 总被引：13，自引：0，他引：13
基于内容的图像检索技术，即从大量的静止或活动视频图像库中检索包含目标物体的图像（或视频片段），在高度信息化的今天，已成为内容图像库中图像信息组织和管理不可缺少的技术，本文介绍了基于内容检索技术的进展，并对其主要方法如基于颜色、形状、纹理等静止图像检索技术以及视频检索技术进行了讨论。 相似文献
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利用视频片段辅助大学英语听说教学,有助于给学生创造良好的英语学习氛围,直观地感受中西方文化差异,从而增强活学活用的外语交际能力。本文探讨如何选择视频片段来优化视听说课教学内容。 相似文献
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现有教师实践反思方式无法客观全面记录课堂场景,只能按照时间顺序浏览录像带,受教师主观因素影响较大。随着技术条件的不断成熟,可以构建以视频注释和检索为核心的视频案例支持系统,让所有教师随时对视频内容进行检索、自动播放视频注释片段、定制个性化主题学习,更好地促进教师实践反思,进而提升教师专业能力。 相似文献
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基于内容的视频检索关键技术研究 总被引：2，自引：1，他引：2
主要讨论基于内容的视频检索技术研究中一些关键问题：镜头分割，关键帧的提取，视频检索，相关性反馈等。展望了视频检索技术的发展前景。 相似文献
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为了迎合广大受众对广播电视的要求,提升其基本的竞争能力和水平,广播电视媒体也在进行不断的技术革新和改革。目前,广播电视媒体中主要应用的技术就是视频技术。笔者广播电视的现状出发,论述了其常用的视频技术,希望可以给人们一定的参考价值。 相似文献
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随着安社会视频监控系统迅速向数字化、网络化的新一代系统迈进,安防产业面临着一个新兴的、机遇与挑战并存的发展成长空间,智能视频监技术发展将势不可挡。本文设计一个安全的视频监控方案。该方案新增加的视频监控点,采用前端模拟设备和视频服务器,通过视频服务器实现图像采集编码一体化,并考虑如何将智能分析的结果用于快速检索。面对未来海量的视频图像数据,需要在视频数据存储之前进行特征叠加的图像预处理,便于在事后可以对海量视频信息进行快速检索。 相似文献
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视频切换技术广泛应用于监控系统、现场转播、广播电视、多媒体教学监控系统等诸多领域,需要从众多的视频信号中正确、快速、无失真的选择出一路信号传送到输出设备上。系统以AT89C51单片机为核心,通过识别键盘按钮开关发出相应选择信息,从而控制MAX440中心控制元件完成所需要的视频切换功能。主要研究视频线的选择、视频切换接口电路、通道显示电路及程序设计以及系统调试。经过测试系统性能良好,为实际视频矩阵切换系统的设计提供了有价值的参考。 相似文献
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本文概述了柘林湖旅游风景区视频监控系统的设计与实现,方案很好的结合了旅游封闭水域的水上安全监管特点,阐述了视频监控系统的总体构成、基本功能及王要设备的配置,分析了旅游封闭水域的水上安全视频监控系统的特点,总结了先进的视频监控技术对水上交通安全监管的重要意义,代表了江西省水上安全监管的先进技术,并对系统的拓睦做出前景展望。 相似文献
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基于文本信息的数字视频检索研究 总被引：6，自引：0，他引：6
基于文本信息实现数字视频信息的检索，既符合一般用户的检索习惯，又可借助日趋成熟的文本检索技术。本文将从数字视频信息的检索需求入手，研究数字视频信息的文本描述方法以及需要解决的问题，并给出了一个基于文本信息的数字视频索引与检索模型。 相似文献
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本文介绍了以国家广电总局PSI/SI为行业标准定义的PAT、PMT、SDT等信息表查找传输流网络中所包含的传输流信息以及各个传输流中的节目构成情况。从市面常用的数字机顶盒出发,提供了节目搜索过程软件实现的解复用程序伪代码。高清数字电视是未来电视系统发展的趋势,其发展方向和热点在于向用户提供更多的增值业务,解复用技术是数字电视的核心技术之一,它的开发应用也将推动视频产业的向前发展。 相似文献
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As an information medium, video offers many possible retrieval and browsing modalities, far more than text, image or audio. Some of these, like searching the text of the spoken dialogue, are well developed, others like keyframe browsing tools are in their infancy, and others not yet technically achievable. For those modalities for browsing and retrieval which we cannot yet achieve we can only speculate as to how useful they will actually be, but we do not know for sure. In our work we have created a system to support multiple modalities for video browsing and retrieval including text search through the spoken dialogue, image matching against shot keyframes and object matching against segmented video objects. For the last of these, automatic segmentation and tracking of video objects is a computationally demanding problem which is not yet solved for generic natural video material, and when it is then it is expected to open up possibilities for user interaction with objects in video, including searching and browsing. In this paper we achieve object segmentation by working in a closed domain of animated cartoons. We describe an interactive user experiment on a medium-sized corpus of video where we were able to measure users’ use of video objects versus other modes of retrieval during multiple-iteration searching. Results of this experiment show that although object searching is used far less than text searching in the first iteration of a user’s search it is a popular and useful search type once an initial set of relevant shots have been found. 相似文献
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《普罗米修斯》2012,30(1):59-74
In the mid-1980s the AUSSAT satellite brought television and radio to remote Australia for the first time. There was concern amongst Aboriginal communities that the imposition of mass media without consultation could result in permanent damage to culture and language. However, over the years, the Warlpiri people have adopted modern communication technology including radio, video making, locally produced television, and more recently on-line services. This paper examines why the Warlpiri have adopted modern communication technology and whether there have been social changes as a result. It also looks at the pioneering media work by the Pitjantjatjara people at Ernabella in the far north of South Australia. 相似文献
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广播影视一直是高科技、重装备的行业,在科学技术不断革新的影响下,文章以南宁市为例,对科技创新给广播影视行业在新的历史时期实现新的定位,把握新的机遇以及通过运用高新技术成果,广播影视行业逐步开展广播影视公共服务体系的搭建,提升文化的传播力与服务力,提高全民文化素质等进行了思考。 相似文献
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In this paper, we present ViGOR (Video Grouping, Organisation and Recommendation), an exploratory video retrieval system. Exploratory video retrieval tasks are hampered by the lack of semantics associated to video and the overwhelming amount of video items stored in these types of collections (e.g. YouTube, MSN video, etc.). In order to help facilitate these exploratory video search tasks we present a system that utilises two complementary approaches: the first a new search paradigm that allows the semantic grouping of videos and the second the exploitation of past usage history in order to provide video recommendations. We present two types of recommendation techniques adapted to the grouping search paradigm: the first is a global recommendation, which couples the multi-faceted nature of explorative video retrieval tasks with the current user need of information in order to provide recommendations, and second is a local recommendation, which exploits the organisational features of ViGOR in order to provide more localised recommendations based on a specific aspect of the user task. Two user evaluations were carried out in order to (1) validate the new search paradigm provided by ViGOR, characterised by the grouping functionalities and (2) evaluate the usefulness of the proposed recommendation approaches when integrated into ViGOR. The results of our evaluations show (1) that the grouping, organisational and recommendation functionalities can result in an improvement in the users’ search performance without adversely impacting their perceptions of the system and (2) that both recommendation approaches are relevant to the users at different stages of their search, showing the importance of using multi-faceted recommendations for video retrieval systems and also illustrating the many uses of collaborative recommendations for exploratory video search tasks. 相似文献