Video surveillance is everywhere today, from private home installations
to massive enterprise deployments. And while the migration from analog
to IP has been on the rise for several years, many companies of all
sizes and shapes have been hesitant to make the leap to an IP-based
video surveillance cameras installation. This blog will provide some
knowledge of IP cameras, which may help you learn more about IP cameras
and decide whether or not to add IP cameras to your current video
surveillance system. IP cameras are different from traditional analogue
security cameras. They are transmitting digital video signal (and also
including audio signal) for surveillance purpose, and can be connected
directly to a router or to a hub in a local network. Users can view the
live images within a local network (LAN) or through any computer
connected to the Internet (WAN) anywhere in the world. Usually, an IP
camera has many advanced functions such as motion detection and alarm
via E-mail, video loss alarm, which allows user to verify what has
happened in the monitored areas.
There are five main body styles of
IP cameras, but most people end up choosing between dome and bullet IP
cameras. Dome IP camera (left in the figure below) is a type of IP
camera with dome cover. It’s the most widely used camera category
because of their ease of installation and the fact that their appearance
blends in nicely with most architectural environments. A bullet IP
camera (right in the figure below) is a relatively small IP camera that
can be placed inside or outdoors, typically for security and to pick up
an image that is then relayed to a recorder or viewing device. The name
bullet IP camera comes from the relatively small size, as well as the
general shape of the cameras which tend to be long and cylindrical.
For LAN access, a static IP address is assigned to the camera in the
network router. The user enters this address into a PC, smartphone, or
other device connected to the LAN, and logs in using a customizable
username and password. For access outside the LAN, a port is forwarded
to the camera in the network router settings and a DDNS address is set
up in the camera. This enables the same streams from the camera to be
broadcast anywhere in the world over an Internet connection. In systems
where the camera stream must be recorded, a network video recorder (NVR)
is connected to the LAN. The address and login credentials for the
camera are entered and the stream can be captured as needed for later
viewing.
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