Day Night Colour Infrared Light Emitting Diode (Night Vision)
CCTV Security Cameras
Colour Day Night CCTV Cameras with inbuilt
Infrared Light Emitting Diodes
"See-in-the-Dark" and produce images when visible illumination
is zero.
At average levels of illumination
these CCTV Cameras produce Colour
images, depending on their sensitivity (Lux) at low illumination
levels and in total darkness the image is Monochrome.
Ordinary Colour CCTV Cameras are
relatively insensitive to Infrared because they have an IR CUT
Filter between the Lens and Image Sensor, this filter excludes
Infrared radiation with a wavelength greater than ~ 700 nm that
would otherwise adversely affect White Balance, Colour Rendition
and Image Sharpness.
Day / Night Colour CCTV Cameras are
sensitive to Infrared because they either do not have an IR CUT
Filter or utilise a special NOTCH IR CUT Filter that excludes
the wavelengths most harmful to colour quality (720 ~ 830 nm)
from reaching the Image Sensor.
A Colour CCTV Camera that does not
have an IR CUT Filter usually has
poor colour rendition
characterised by a
Pink-Red
'tint' when the illumination is InfraRed rich,
use of a 'Notch' Filter helps however White
Balance, Colour Rendition and Image Sharpness are
compromised for Infrared sensitivity.
The IDEAL Day / Night Infrared
Sensitive Colour CCTV Camera would utilise an
Automatic Iris Lens to cope with high
illumination levels and the Lens would also have a large
aperture (low 'F' number) to maximise light transmission when
illumination levels are low * it would also utilise a
Traditional IR CUT Filter when illumination levels are adequate
for Colour and then REMOVE the IR CUT Filter when levels
are low
Maxi-D/N
Maxi-dnHQ1
Dome DPS
Maxi-DayNite
Dome-DayNite
Maxi-D/NiteHQ1
DomeIR-DPS Dome-D/NiteEx
Maxi-D/NiteEx &
CCS-IRdnWD2 have these features and
are recommended for OPTIMUM results - the
ULTIMATE SOLUTION is
AutoCam-dn or
DomePTZ-dn2 or
DomePTZ-dn3 these also have
Automatic-Focus to ensure crisp images under all conditions.
Infrared
rich light sources include Daylight and most Filament type lamps
including common Spot lamps, Tungsten lamps, Halogen lamps, etc.
The majority of Light emitted from
'Cold' type sources such as Fluorescent, Mercury Vapour, Sodium
Vapour, etc., is visible, these sources contain little Infrared
energy.
SUMMARY: "See-in-the-Dark"
Infrared capability using a 'Notch'
or no 'IR CUT filter' is a
trade-off that adversely affects Colour Rendition in "Infrared
Rich" environments.
click on image to
enlarge
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