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| Rainbow cameras and zoom lenses used at US freeway and intersection controls
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HIGH-end Video Server Module board W1860
W1804 Video Server
W1802D both D1 Video Server
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W1801D single channel video server D1
W1802C both CIF Video Server
W1801C CIF single channel video server
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Cameras and zoom lenses from Rainbow are being used at freeway and intersection
controls throughout the US by Florida-based Control Technologies who have chosen
a modified version of Rainbow’s 1/3†black and white 580 TV lines
camera.
Based on data from the cameras, civic authorities are able to
calibrate the cycle of signalised intersections and where necessary speed up
vehicle exits from congested stretches of freeway. The aim is not only to ease
movement on freeways but minimise congestion at known city bottlenecks.
Control Technologies ensures that the client is able to monitors images
using methods that are most appropriate to the particular environment and
information needs. Images are fed to a video processor which may evaluate a
traffic scene through pixel analysis, or the scene of free-flowing traffic might
be assessed by the processor according to factors such as speed, volume on
individual lanes or ‘headway time’, this being the gap between one vehicle and
the next. The system can also use five classifications when distinguishing
between vehicles by length.
The Rainbow cameras are mounted on freeway
gantries, luminaires and mast arms. They are being used in conjunction with
Rainbow’s 6.5~65mm F1.4 auto-iris zoom lenses.
Rainbow’s 1/3†black and
white BL58D camera uses a Sony Super HAD CCDTM image sensor. The unit has
backlight compensation and a Backfocus Mode TM for one-touch backfocusing. The
camera can operate at a minimum illumination of 0.06 lux at F1.2. The electronic
iris is 1/60~1/100,000 sec and operating conditions are 14°F to 122°F (-10°C to
+50°C). Weight (camera only) is 7.1 oz (200g).
The sophisticated scene
analysis approach used by Control Technologies is superior to simple magnetic
sensors and the techniques are being employed successfully in states including
Texas, Florida, Georgia, Virginia, Washington DC and New York.
IP/Network camera server; Wireless Network
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