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Chap.9 System Design
Chap.9
System Design
9.1 Identifying Customers Needs
Before deploying an IP surveillance system, having a layout map of the site at hand to identify the shooting
purposes of each network camera is necessary and useful. The map gives you an overview of the installation
site and helps you have an in-depth discussion with your customers. You can have a more general idea about
the number of cameras the whole system needs, cabling scheme, and other peripherals such as speakers,
microphones, and joysticks required so as to achieve an efficient installation.
Generally, cameras are used for viewing or recording, or both of them. For special requirements such as object
tracking, people counting, motion detection or plate identification, intelligent capability in cameras or software will
be needed.
9.1.1 Viewing Considerations
The following factors should be your main considerations when installing a network camera.
Viewing Direction
The shooting direction determines the lens and camera types, placement, or even the coverage of a camera. Bear
in mind that cameras' shooting direction should be in line with the direction of illumination to minimize the influence
of backlighting on image quality. Sometimes people may feel uneasy with the cameras pointing at them; in this
case, you may choose cameras with a smoke cover.
Viewing Distance
A camera with zoom capability is needed if you want to capture close-up images of an object at a distant. The
zoom time will determine how close you need. A vari-focal lens offers a small zoom capability, which is adjusted
manually via a controller.
Viewing Angle
If the monitored area is a wide open field, a camera with PTZ movement or a wide angle lens is highly
recommended. PTZ cameras can instantly move to a position you want to see by a click on browser or software. A
wide angle lens may offer extensive coverage of depth-of-view, but suffer barrel distortion.
Viewing Object
In case of monitoring a fast moving object such as vehicles, it is highly suggested to use a camera with a
progressive scan CCD sensor. Progressive technology can help you generate clear-cut images without jagged
edges; but the interlaced technology happens.
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