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Security Cameras for Monitoring Vehicle Traffic
One of the basic principles of video security is to monitor choke points. Choke points are areas
that funnel people or vehicles.
Entrances are a good example. Monitoring
vehicle traffic into a parking lot or neighborhood is one of the most
productive methods. The camera used for
vehicle monitoring is sometimes called a "License Plate Camera"
(LPC). These systems create a video record of each car and truck visiting your
property.
Private communities, hotels
and casinos, private estates, banks, and critical infrastructure are all
logical markets for license plate recorders. LPC systems offer a security
enhancement in an unobtrusive form.
Camera Requirements
Generally, LPC systems are
be designed to capture the
image of the rear of the vehicles. Currently 19 States do not require
a front license plate. This number is likely to grow because of our economic
environment which is straining state budgets (each plate can cost a little more
than $1 to produce).
The viewing angle, both
horizontal and vertical, from the camera to the automobile should be less than
40 degrees (less is better). Larger angles will distort the view and make
recognition difficult.
A day
and night camera delivers color images during the day, but as light
diminishes, the camera will automatically switch to night mode to make use of
near infrared (IR) light to deliver high-quality, black and white images (Black
and White results in superior performance in low-light conditions because of
the improved contrast).
Near-infrared light, which spans from
700 nanometers (nm) up to about 1000 nm, is outside the human eye’s range.
During the day, a day and night camera uses an IR-cut filter. IR light is
filtered out so that it does not distort the colors of images as the human eye
sees them. When the camera is in night (black and white) mode, the IR-cut
filter is removed.
This improves color reproduction in
daylight and imagery at night. Featuring
30 IR LEDs, the true day/night camera works in complete darkness, and offers a
visibility distance up to 164’ (50m).
The OSD (On-screen Display) menu enables operation and control of the
digital control functions built-in to the camera.
B.V. Technology License Plate Camera Specifications
·
Model Number: IC50-38
·
·
Back-Light Compensation: On/Off
·
Sensitivity: 0.2 Lux/F2.0 (the camera
without the night-vision module engaged)
·
Night Vision:
30 each,
¢8 mm
IR-LED,
Wavelength:
850 nanometers,
Range:
50 Meters (164’)
·
Electronic Shutter: 1/60~1/100,000 seconds,
·
Lens: Auto Mechanical ICR (Infrared
Cut Filter Removable) 9-22mm lens,
·
CCD Sensor:
1/3" Sony SUPER HAD
CCD Image Sensor
·
Weatherproofing: IP66
License
Plate Recorder Design Worksheet