网络化的楼宇可视终端系统的设计

为了克服以往模拟监控系统在信号、布线、传输距离方面的局限性及以PC机为用户端的网络监控系统的体积限制,提出了基于嵌入式Linux的网络可视终端系统的解决方案.在电子门侧采用嵌入式Linux平台,利用Video ForLinux内核接口函数,结合USB摄像头来实现单帧和视频连续帧的采集,采用MJPEG标准进行视频图像压缩,通过TCP/IP协议实现网络传输;在用户端用支持嵌入式Linux的彩屏终端系统对视频数据进行接收、解码和显示.该方案使监控系统小型化、低成本化,且图像显示清晰、实时性好.

Design of networking visual terminal system for buildings

In order to overcome the limitations of the previous analog monitoring system in signals,wiring,transmission distance and the network monitoring system taking PC as the user terminal in volume,this paper presents a solution to the netwoking visual terminal system based on embedded Linux.The system employs an embedded Linux platform on the electronic gate side,uses a programming interface function based on Video For Linux,combines USB camera to realize the acquisition of a single-frame image or video images frame by frame,and realizes the compression of video images in terms of the MJPEG standard and the network transmission by TCP/IP protocol;On the user side,the system decodes and displays the video data with support of an embedded Linux colorful screen terminal system and thus to realize the data reception.The solution has advantages of making monitoring system diminutive in volume,lower in cost,clearer in the image display and better in real-time processing.