监控系统是安防系统中应用最多的系统之一，现在市面上较为适合的工地监控系统是手持式视频通信设备，视频监控现在是主流。 从最早模拟监控到前些年火热数字监控再到现在方兴未艾网络视频监控，发生了翻天覆地变化。在IP技术逐步统一全球今天，我们有必要重新认识视频监控系统发展历史。从技术角度出发，视频监控系统发展划分为第一代模拟视频监控系统(CCTV)，到第二代基于"PC+多媒体卡"数字视频监控系统(DVR)，到第三代完全基于IP网络视频监控系统(IPVS)。钢制闸门 钢坝 保定轻钢别墅 保定平面设计培训 保定室内设计培训 保定办公家具 保定空调维修
The monitoring system is one of the most widely used systems in the security system. Now the more suitable site monitoring system on the market is handheld video communication equipment, and video monitoring is now the mainstream. Earth shaking changes have taken place from the earliest analog monitoring to the hot digital monitoring in previous years, and then to the emerging network video monitoring. Today, with the gradual unification of IP technology in the world, it is necessary for us to re understand the development history of video surveillance system. From a technical point of view, the development of video surveillance system is divided into the first generation of analog video surveillance system (CCTV), the second generation of digital video surveillance system (DVR) based on "PC + multimedia card", and the third generation of video surveillance system (IPVS) based entirely on IP network.