为了更好地了解海州湾海洋公园秦山岛近岸水下生物和生态系统,针对现有水下监测平台监测效率低的问题,本文设计了一种基于YOLOv5(You Only Look Once version 5)的近岸水下目标监测平台。该监测平台基于B/S(Browser/Server)架构,开发了...为了更好地了解海州湾海洋公园秦山岛近岸水下生物和生态系统,针对现有水下监测平台监测效率低的问题,本文设计了一种基于YOLOv5(You Only Look Once version 5)的近岸水下目标监测平台。该监测平台基于B/S(Browser/Server)架构,开发了视频信号的接收及存储模块、天气查询地图模块、目标监测模块和数据展示模块。通过水下定点监测,自建秦山岛近岸海洋生物数据集,训练目标检测模型,在目标监测模块中嵌入训练好的YOLOv5目标检测算法和DeepSORT(Deep Simple Online and Realtime Tracking)追踪算法,使监测平台更加智能、准确、高效。结果表明:该万维网(World Wide Web,WEB)平台运行稳定,具有较强的实用性,对于掌握海岸近岸生态情况和保护生态环境具有积极作用。展开更多
目前基于实时流协议RTSP(Real Time Streaming Protocol)的流媒体应用日益受到重视,在Internet上传输流媒体的相关技术已成为热点,但是围绕RTSP的研究主要集中在其应用上,对其安全性的研究没有引起人们的重视。随着RTSP的迅速发展,其安...目前基于实时流协议RTSP(Real Time Streaming Protocol)的流媒体应用日益受到重视,在Internet上传输流媒体的相关技术已成为热点,但是围绕RTSP的研究主要集中在其应用上,对其安全性的研究没有引起人们的重视。随着RTSP的迅速发展,其安全性问题将成为其继续发展的瓶颈。具体分析针对RTSP协议存在的诸如恶意监听、修改、结束流媒体会话攻击以及服务器伪装攻击等安全性问题,提出了RTSP双向认证模型。该模型可以有效抵御多种针对RTSP的攻击。展开更多
该文设计了一个基于RTSP（Real Time Streaming Protocol）协议的移动流媒体代理服务器。基于该设计，作者在ApacheMI-NA2．0网络程序框架下实现了该代理服务器。该代理服务器可用于校园、酒店等公共热点环境，为具有wiFi功能的智能手...该文设计了一个基于RTSP（Real Time Streaming Protocol）协议的移动流媒体代理服务器。基于该设计，作者在ApacheMI-NA2．0网络程序框架下实现了该代理服务器。该代理服务器可用于校园、酒店等公共热点环境，为具有wiFi功能的智能手机提供音视频接入服务。展开更多
With the widespread use of streaming media application on the Internet, a significant change in Internet workload will be provoked. Caching is one of the applied techniques for enhancing the scalability of streaming s...With the widespread use of streaming media application on the Internet, a significant change in Internet workload will be provoked. Caching is one of the applied techniques for enhancing the scalability of streaming system and reducing the workload of server/network. Aiming at the characteristics of broadband network in community, we propose a popularity-based server-proxy caching strategy for streaming medias, and implement the prototype of streaming proxy caching based on this strategy, using RTSP as control protocol and RTP for content transport. This system can play a role in decreasing server load, reducing the traffic from streaming server to proxy, and improving the start-up latency of the client. Key words streaming server - proxy - cache - streaming media - real time streaming protocol CLC number TP 302 - TP 333 Foundation item: Supported by the National High Technology Development 863 Program of China (2001AA111011).Biography: Tan Jin (1962-), male, Ph. D candidate, research direction: network communications, multimedia technologies, and web caching.展开更多
Nowadays mobile streaming service through cell phone is becoming the highlight of new value-added mobile services. Based on the present CDMAlx wireless data network and Binary Runtime Environment for Wireless （BREW）...Nowadays mobile streaming service through cell phone is becoming the highlight of new value-added mobile services. Based on the present CDMAlx wireless data network and Binary Runtime Environment for Wireless （BREW） platform, adopting compression technologies of H.264 and QCP, a set of streaming media players are designed and implemented, and the principle, structure, key technologies and performance analysis of this system are introduced. This player works well in practice.展开更多
课堂直录播是目前高校教育数字化转型普遍采取的措施之一,但是课堂教学直播对直播质量提出了更严格的要求。文章对直播中教师分享的课件画面偶发断流问题,开发应用软件检测讲台电脑是否实时在线,结合OpenCV轮巡拉取网络摄像头的实时流...课堂直录播是目前高校教育数字化转型普遍采取的措施之一,但是课堂教学直播对直播质量提出了更严格的要求。文章对直播中教师分享的课件画面偶发断流问题,开发应用软件检测讲台电脑是否实时在线,结合OpenCV轮巡拉取网络摄像头的实时流媒体协议(Real Time Streaming Protocol,RTSP)流,并利用多线程开发技术提升监测效率,及时发现存在异常的直播流,便于尽早解决直播问题,提升教学直播的稳定性与可靠性。展开更多
介绍了实时流和实时流协议,针对基于实时协议的流媒体客户端播放器的特殊要求,提出了一种适用于视频点播(Video On Demand)的流媒体客户端结构模型,研究并设计了相应的流量控制策略、组包算法和缓存管理策略。试验结果表明,该客户端播...介绍了实时流和实时流协议,针对基于实时协议的流媒体客户端播放器的特殊要求,提出了一种适用于视频点播(Video On Demand)的流媒体客户端结构模型,研究并设计了相应的流量控制策略、组包算法和缓存管理策略。试验结果表明,该客户端播放器占用系统资 源少,具有良好的实时性、容错性和同步性。展开更多
基于Android 2.3.1设计并实现了实时视频流传输系统。视频数据压缩算法采用H264,数据传输使用点对点P2P(Peer to Peer)。系统分两个层次,底层使用C++实现RTP封装与解包、P2P网络传输、视频采集与编解码等;上层使用Java实现对界面的控制...基于Android 2.3.1设计并实现了实时视频流传输系统。视频数据压缩算法采用H264,数据传输使用点对点P2P(Peer to Peer)。系统分两个层次,底层使用C++实现RTP封装与解包、P2P网络传输、视频采集与编解码等;上层使用Java实现对界面的控制。Java界面层通过JNI(Java native interface)调用C++接口,上下层之间无视频数据的拷贝操作,提高了系统性能。同时,设计实现解码错误弹回策略,根据解码错误反馈信息,了解当前网络拥塞情况,灵活调整帧率和压缩图像分辨率。系统在4台三星S5PV210开发板上的运行效果良好。该系统可以作为视频会议、监控系统等的参考或组成部分。展开更多
文摘为了更好地了解海州湾海洋公园秦山岛近岸水下生物和生态系统,针对现有水下监测平台监测效率低的问题,本文设计了一种基于YOLOv5(You Only Look Once version 5)的近岸水下目标监测平台。该监测平台基于B/S(Browser/Server)架构,开发了视频信号的接收及存储模块、天气查询地图模块、目标监测模块和数据展示模块。通过水下定点监测,自建秦山岛近岸海洋生物数据集,训练目标检测模型,在目标监测模块中嵌入训练好的YOLOv5目标检测算法和DeepSORT(Deep Simple Online and Realtime Tracking)追踪算法,使监测平台更加智能、准确、高效。结果表明:该万维网(World Wide Web,WEB)平台运行稳定,具有较强的实用性,对于掌握海岸近岸生态情况和保护生态环境具有积极作用。
文摘目前基于实时流协议RTSP(Real Time Streaming Protocol)的流媒体应用日益受到重视,在Internet上传输流媒体的相关技术已成为热点,但是围绕RTSP的研究主要集中在其应用上,对其安全性的研究没有引起人们的重视。随着RTSP的迅速发展,其安全性问题将成为其继续发展的瓶颈。具体分析针对RTSP协议存在的诸如恶意监听、修改、结束流媒体会话攻击以及服务器伪装攻击等安全性问题,提出了RTSP双向认证模型。该模型可以有效抵御多种针对RTSP的攻击。
文摘With the widespread use of streaming media application on the Internet, a significant change in Internet workload will be provoked. Caching is one of the applied techniques for enhancing the scalability of streaming system and reducing the workload of server/network. Aiming at the characteristics of broadband network in community, we propose a popularity-based server-proxy caching strategy for streaming medias, and implement the prototype of streaming proxy caching based on this strategy, using RTSP as control protocol and RTP for content transport. This system can play a role in decreasing server load, reducing the traffic from streaming server to proxy, and improving the start-up latency of the client. Key words streaming server - proxy - cache - streaming media - real time streaming protocol CLC number TP 302 - TP 333 Foundation item: Supported by the National High Technology Development 863 Program of China (2001AA111011).Biography: Tan Jin (1962-), male, Ph. D candidate, research direction: network communications, multimedia technologies, and web caching.
文摘Nowadays mobile streaming service through cell phone is becoming the highlight of new value-added mobile services. Based on the present CDMAlx wireless data network and Binary Runtime Environment for Wireless （BREW） platform, adopting compression technologies of H.264 and QCP, a set of streaming media players are designed and implemented, and the principle, structure, key technologies and performance analysis of this system are introduced. This player works well in practice.
文摘课堂直录播是目前高校教育数字化转型普遍采取的措施之一,但是课堂教学直播对直播质量提出了更严格的要求。文章对直播中教师分享的课件画面偶发断流问题,开发应用软件检测讲台电脑是否实时在线,结合OpenCV轮巡拉取网络摄像头的实时流媒体协议(Real Time Streaming Protocol,RTSP)流,并利用多线程开发技术提升监测效率,及时发现存在异常的直播流,便于尽早解决直播问题,提升教学直播的稳定性与可靠性。
