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先决定监视用摄像机数目，再根据具体的情况确定摄像机的镜头监视范围：必须要明确摄像机到监控点的距离和需要监控的面积，大家可以根据下面的公式得出大致的镜头参数。至于清晰度，我们认为：监控 420电视线的摄像机已经足够了。
第三步：是否要有夜视功能在走廊、门厅、过道、库房等光线比较暗的地方，可以考虑红外夜视功能的摄像机，需要注意的是，红外摄像机除专业夜视或特别订制以外，红外摄像机也需要现场有灯光辅助五指的条件下，工控 红外距离会成倍缩短。现场如果为花园草坪，红外效果更差。
第四步：是布线还是采用无线除了昂贵的价格以外，无线网络确实省去摄像机布线的麻烦与不美观，但需要注意监控距离与障碍的问题。原则上水泥建材会缩短无线的传送距离，,金属材料则会完全遮蔽无线讯号，工控 (...) 第五步：现场监控与网络监控您在确定监控系统的时候，要考虑是否需要网络功能，也就是说如果您需要在互联网随时对监控现场进行监视和控制，就需要选择具有网络功能的主机。
摄像机的安装高度与位置跟现场环境有很大的关系，电梯还与摄像机本身的焦距有关系，大概来说，在位置上尽量隐蔽安装，否则会遭到破坏的危险，但也有例外，比如超市，装监控本来就是想让顾客看到，起个危慑作用，这自然就另当别论了；
在安装高度上，这跟摄像机的监控目标区域有关系，如果要全局监控的话，为了保证更好的视线，那么摄像机是能高就高呀，但是也得注意立竿的“风摆”影响，因为摄像机看得越远，立竿偏摆一厘米，电梯100米外的监控画面就会摇摆一米了。中央空调 如果摄像机仅仅是看进出门口的行人的话，智能家电 那么摄像机就不宜装得过高了，否则看的就全是头顶了，这么说你应该能理解吧。