H.264 转码•视频检测•CS/BS 景区监控与导游多网融合系统

        作品以中山陵为应用背景，构建了 H.264 转码平台+BS/CS混合模式+ WiFi/WiMAX 无线网络的监控与导游系统，实现了智能移动视频监控（事件检测、报警发布）、移动导游（移动视频、互动地图界面）、高清播放等功能。 系统以H.264 转码平台统一视频格式，兼容异构图像，降低约4 倍码率， 无需更换摄像机等前端设备，获得了可观经济效益。 

        针对无线IP 网络带宽受限、易受干扰，采取了图像细节/运动的内容检测， 自H.264 的NAL 层动态调整视频帧率或分辨率，这一穿层视频QoS 控制。 针对景区监控特点，综合采用自适应背景消除与三帧差相结合的混合算 法、改进模板匹配等算法，在监控中心对“逆行”及“越界”等视频事件进行 检测分析预警，提高了监控效率。

        为适于地理视频环境的导游和监控，构建BS/CS 混合网络架构。利用客户 端手持PDA 上SVG 地图浏览器和ViewBox 视窗播放器，实现移动导游和媒体 播放，分别发挥BS 的易操作及跨平台性、CS 的响应实时的各自优点。

        针对视频事件检测、H.264 实时转码、高清视频再现等复杂运算，充分利 用 Intel 双核嵌入之星开发平台，及 IPP、MMX、Pthread 等手段进行优化，获 作品 得了成倍性能提升。 这在高清数字电视，高速公路联网智能监控，城市社区服务，水文检测、 简介电子政务等领域也有广泛应用。
 
This work is designed for the application of Sun Yat-sen Mausoleum, a wireless video surveillance and tour guiding system is built which is based on the H.264 transcoding platform, BS/CS hybrid mode and WiFi/WiMAX networks. This system integrates intelligent mobile video surveillance (real-time monitoring, incident detection, alerting), mobile tour guide (VoD, interactive map over PDA) and HD video playback. 

Heterogeneous videos are transcoded to H.264 video stream by the system as a result that the original equipment could be saved and the efficiency of the channel can be much higher.
Due to the quality of susceptible wireless communication and the limited bandwidth , this system can timely focus on image contents of fast-moving or detail requirements while adaptively modifying the frame rate and resampling in the H.264 NAL layer to offer a better video QoS control. This system uses a combination of adaptive background subtraction and three- frame differencing algorithm, and an improved template match algorithm in the detection of retrograde and cross-border processing to increase the efficiency and accuracy of video monitoring. The BS/CS network structure is used to suit for different conditions of guiding and monitoring. The clients get multimedia and guidance services through SVG map and Viewbox explore which are supported by their handed PDA. This mode of service not only obtains the easy operation advantages of BS but also the real-time advantages of CS. With the optimizing of Multi-threading, IPP, MMX, on “Embedded Star”, the system could deal with many functions such as real-time video surveillance, real-time H.264 transcoding, HD video playback etc. with high efficiency. The system could also be used in the domains as follows: HDTV, expressway Network Monitoring, city community services, hydrometeorology surveillance E - government and so on.
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