With the world's sustaining care on security, Video Surveillance System is being a more and more important role in every layer of society as the safe guarding method.

随着世界对安全的不断关注，视频监控系统作为重要的安全防护手段越来越深入到社会生活的各个层面。

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Public video surveillance and control system has the social attributes on the public nature, purpose of security and restrictive of privacy. It has the positive and negative functions.

公共视频监控系统具有公共性、安防目的性和对个人隐私权的限制性三个社会属性，其功能也有积极和消极两个方面。

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Furthermore, this system provides some functions of security network management, such as the statistics of data stream, the surveillance of present active connections, etc.

此外还提供部分安全网管功能，如数据流量统计和当前活动连接查看等。

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Security preparations, including the installation of a high-tech surveillance system for over 100 venues, are behind schedule.

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The planned system, called the Lower Manhattan Security Initiative, will establish a network of thousands of surveillance cameras to monitor and track vehicles and pedestrians south of Canal Street.

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