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- So many considerations exist for security camera selection...
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- COLOR or BW security cameras
- Color CCTV cameras allow better recognition of people and
vehicles in general. Usually considered easier on the eyes as
well, color can make identifying easier in general. However it
usually comes at the cost of light sensitivity. Though many ccd
manufacturers are improving chip design, most color camera's
ccd do not perform as well in low light as the black and white
or monochrome counterparts. BW cameras are usually better performers
in low light, and often have a higher S/N (signal to noise) ratio.
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- Current design of CCTV cameras has merged the abilities of
the two for many applications. True "day/night" cameras
have a mechanical IR cut filter. This means the camera physically
removes the IR filter from in front of the CCD allowing maximum
sensitivty. Other means are by using two separate CCDs to accomplish
the same task. In this case however, the separate CCDs allow
more accurate reproduction of the video under day and night conditions.
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- Voltage for your CCTV camera
- As discussed in the power
supply section, voltage selection is dependent on a few items.
Distance is probably one of the most considered when a choice
is to be made. As a rule, if you are running power more than
150' to your security camera, try to implement a 24VAC system.
There are many good Dual voltage Cameras on the market today,
but most operate best on 24VAC. - more to come
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- Resolution of your Surveillance camera
- More is better! Generally, the higher quality picture you
start with, the better. Most digital video recorders are not
yet able to record in as high a resolution as the better security
cameras, but when the DVR interpolates the video, it can more
accurately compress with more information available to it. (I
will expand on this in future articles)
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- Style of your security camera
- Size, shape, color are all things to consider as a result
of placement environment and cost. While Dome cameras and Bullet
cameras are "all inclusive" containing a lens, housing,
and sometimes are weather resistant, do they allow the flexibility
the C/CS or Body style cameras will? - To be continued
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- Special Features
- Digital slow shutter, (DSS) Wide Dynamic Range, (WDR) Digital
Noise Reduction, (DNR) and Pan Tilt Zoom, (PTZ) are terms thrown
about in the CCTV industry. Are these add-ons worth the added
cost? Do they actually make a differenc? - To be explored
in weeks to come
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- More articles to follow
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- ICU1.com
- CCTV CAMERAS
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