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Guide
to Digital Surveillance Systems
What you'll need to know - but they don't tell you
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portions of this article appeared in America's
Car Care Business magazine - March 2005
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In the towns where I have car washes, the Police are astounded at
the quality of the video clips I give them. But it wasn't always
that way. In fact, ten years ago they weren't interested in looking
at any video evidence I had because they said that the pictures
were so poor that it wouldn't do them any good to look at them.
Things didn't improve
much when I put in my first Digital Surveillance System seven years
ago. The technology was brand new, the system was plagued with problems,
and getting video clips off of the machine to give to the Police
was problematic at best, and took hours to accomplish.
Now, after many years
and 5 digital systems later, I have learned what to look for and
what to avoid. There are literally reams of data that I have collected
that can help you find a good Digital System, but to keep it short
and simple, I will attempt to cover the most important aspects to
look for so that you can make sure you end up with a system that
will be worth what you paid for it.
Here
is the #1 lesson I have learned: Shopping for price alone can end
in disaster!
On the Internet, you
can find complete Digital CCTV packages of 4 to 16 cameras, including
a monitor and Digital recorder. Often they look like great deals
- but the wrong system can deal you untold grief. Many Dealers will
put together low-end packages to try to lure price-conscious shoppers
- these systems suffer from lower quality, shaky reliability, and
will not last for years and years the way higher quality systems
will. Low-quality components and a lack of support combine to create
an offer that can do more harm than good to your business.
To avoid getting cheap
consumer-grade junk, take a closer look at the actual specs of the
individual components. If the specs aren't offered, ask for them.
If they are vague and the answer is not satisfactory, or they won't
give them to you at all, move on to another supplier.
How to Choose Quality Cameras -
The best cameras consist
of two basic, but very crucial elements - the quality of the image
sensor and the quality of the parts and engineering of the camera
components themselves. Listed in the specifications of each camera,
you will find out who makes the "guts" of the camera.
In other words, what name brand chipset is at the heart of this
camera? There are numerous brands out there, but the top two are
Sony and Panasonic. Both of these brands will give you an excellent
picture and the longest life. Both Sony and Panasonic offer several
levels of chipsets, so always look for these minimum performance
parameters, no matter what type or style of camera used, or who's
name is on the outside:
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Type: Grade "A"
CCD (Charge Coupled Device) Imaging Chipset
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Format: 1/3"
or ¼" focal length (1/3" gathers more light
and has a wider view, but ¼" is fine for high resolution
models in well lit areas)
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Color or Day/Night
operation: (Day/Night versions turn from color to Black &
White under low light conditions)
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TV Lines of Resolution:
380 to 400 lines for medium resolution cameras, and 480 to 500
lines for high-resolution
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Signal to noise
ratio (S/N): at least 48db or higher (50db is visibly better)
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Voltage: 12V DC
is fine for smaller cameras, while 24V AC is usually better,
and is required for any camera with heaters.

Where each camera will
be located at your wash will determine what type or style of camera
to use. For example, here are a few tips for various mounting locations:
Equipment rooms -
For general views of
the equipment room almost any type of camera will work here. However,
if you turn the lights out when you leave, then a Day/Night Infrared
camera that displays a color image under good lighting, then switches
to black & white with Infrared illumination to see in the dark,
is a good choice. If the equipment room is always well lit and you
don't want anyone to see the camera, then a disguised PIR (Passive
Infrared) motion detector style camera with a pinhole lens is a
common choice. Pinhole lenses still give good clear views, but because
of the small surface area of the lens and decreased ability to gather
light, the rooms' lighting needs to be bright.
Changer/Vending Areas -
Since mounting locations
around this area tend to be lower, a vandal-proof dome is a wise
choice. Cameras mounted lower that are supported on a stalk type
of mount can be hit with a stick to turn the camera away from the
area, or covered with a cap or rag so that the thieves can work
unmonitored. These types of domes are extremely rugged and have
no exposed wires that can be cut, and also have security screws
that make it difficult to steal or disable the camera.
Allen Spears has been
in the Car wash business for more than 15 years, and currently owns
4 washes in Texas. Allen is also the Chief Engineer at CarWashCameras.com
(a division of Rugged CCTV), for the past 12 years, and has designed
systems for over 1600 car washes during his career. He can be e-mailed
at allensp@carwashcameras.com,
and can be reached at 1-866-301-CCTV
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