共查询到20条相似文献，搜索用时 75 毫秒
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吴猛 《实验室研究与探索》2018,(8)
设计了一种基于可见光通信的高清视频传输系统,采用自由空间光传输方式,可实现高清视频的采集、处理、无线传输和显示。选取波长为520 nm的可见光激光器作为光源,采用直接调制、探测实现大数据流的传输。实验结果表明:该系统视频实时传输通信距离大于10 m,传输速率为30 Mb/s。通过进一步优化设计,该系统具有传输高清图像、紧急情况下快速建立视频传输链路的能力。 相似文献
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盛立军 《佳木斯教育学院学报》2014,(6):452+454
为实现无PC支持下进行无线视频数据的远程传输,给出了一种家用无线视频监控系统的设计方案。经验证该方案的设计使无线视频监控设备获取的数据更容易通过Internet进行传输和控制,为进一步提高嵌入式技术在无线视频监控系统领域中的应用提供借鉴。 相似文献
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提出一种在车辆自组织网络(VANET)中应用的无线多跳视频传输实验系统的设计和实现方案及其对应的传输控制和路由选择协议.该系统将嵌入式Linux与IEEE 802.11n传输协议集成到ARM内核,由S3C6410主控模块、无线局域网网卡及LCD屏等构成.针对VANET的无线多跳视频传输场景,对视频编译码分别采用H.264和JPEG两种标准实现并对它们的压缩比、时延、传输丢包率等性能进行了理论分析和实验比较,进行了室内室外多种不同场景的实际测试.结果表明:所设计的多跳视频传输实验系统方案能够适应VANET等多种场景的应用,所提出的传输控制和路由选择协议能够保证视频传输的多跳和实时性要求. 相似文献
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介绍了基于S3C2440的家用视频监控系统的硬件平台和开发环境,详细阐述了视频采集、压缩和网络传输的实现过程,最后完成了应用程序向目标平台的移植。实验表明,对捕获的视频帧编码效果良好,满足监控系统需求。 相似文献
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以WindowsXP作为开发平台,Delphi2005作为开发工具,采用VideocapX ActiveX控件,实现了视频的采集和传输。实验结果表明：在开发视频采集和传输系统的过程中使用ActiveX视频控件是很容易实现的。 相似文献
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视频信息的网络化传输及呈现 总被引：2，自引：0，他引：2
张刚要 《常熟理工学院学报》2005,19(2):108-111
介绍了数字时代教育电视系统发展的典型代表：视频信息的网络化传输及呈现,并构建了基于流媒体技术的视频信息网络化传输及呈现系统,针对该系统面临的主要问题给出了应对策略。 相似文献
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针对网络视频通信中对视频图像清晰度以及减少视频过多占用网络资源的双重要求,设计了一种基于OMAP3530视频处理芯片、H.264压缩技术、嵌入式Linux操作系统、RTP/RTCP网络传输协议的数字视频服务器,给出了系统的总体结构与软硬件模块,重点阐述了视频采集及处理的过程。客户端通过接收、解码及显示监控前端传送的H.264视频流,实时显示监控场景。实验表明,系统实时监测性能良好,图像解码清晰、稳定,具有很强的实用性和广阔的发展前景。 相似文献
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《实验室研究与探索》2019,(9):14-18
针对在国内目前通信教学和科研活动中缺乏真实现场验证这一问题,提出了使用通用USRP实现以OFDM技术为基础的实时无线视频传输实验,分析了视频传输系统的发送端、接收端和实验的实现过程。与仿真验证相比,实验测试中以真实信道为传输环境,贴近现实的通信系统,使得需要验证的信号处理算法在性能评估上更具有说服力,对通信学科的形象化教学和科研具有重要推动作用。 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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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. 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献