The recognized face, of which, the illumination
intensity ( “intensity” in short)
shall not be lower
than 30 Lux
when the device put in a totally dark environ-
ment, the face illumination intensity, 0.5m
distance to the device, is about 100 Lux. The
nearer to the device, the higher the intensity is.
If there is overexposure on the face, the face
characteristics will be unable to be extracted
and may lead to hard recognition.
image and registered image; backlight, side-light and
(Analysis: from the view of human eyes, the color
changes on face skin may result in wrong recognition
of identity; unclear exposure area, no matter large or
The test standard is as shown on the picture:
the angle between dotted line A and dotted line
B is 90 ° , the test adopts the common light
meter with full spectrum, and applies U30 stan-
time.
Back light
Intensity test
Illumination intensity in actual scenarios
Strong light
Side light
Device stands between
device and light source
Side-light may lead to
uneven light on the face
Backlight may make the
face too dark
Direct strong light may
cause overexposure
500 Lux,
overexposure
30 Lux, dim
100 Lux, bright
50 Lux, normal
300 Lux, slight
exposure
Reference to intensity
Illumination intensity
1. Install the device in a place with little impact
from light source.
2. Add a registered image according to the site
condition, and it is suggested to use this product
to enroll images.
3. Properly lower the threshold value according
to usage.
Improvements
Device
0.5m~1m
d
90°
Light source
A
B
When the sunlight shines indoor through the window, the face
recognition terminal device shall not be installed in shown black
shadow area, instead, shall be installed in place with little
sunlight impact, no side-light and no backlight. (Glass window
can be deemed as no walls)
Sunlight shines indoor
If the room has glass wall, there is no shield for sunlight, then it
is suggested to hang curtains over the window, and install the
the recognition. (Glass window can be deemed as no walls)
Glass window
Sunlight shines through the door, the device shall be installed at
the place with shields and little light impact. Glass window can
be deemed as no shields, the device shall be installed at the side
without glass window or with curtain hung.
Sunlight shines through the door, with glass window at
one side
Sunlight shines through the door, the device shall be installed at
the place with shields and little light impact.
Sunlight shines through the door
Suggested installation height (the
distance between the lens and
the ground) is 1.4m,
as the
recognizable body height range,
0.5m distance away from the
device, is 1.3m-1.7m; the
recognizable body height range,
1m distance away from the
device, is 1m-2m. (There are
some deviations)
Camera vertical wide-angle
Camera horizontal wide-angle
Wall
1.4m
Device
Gate
User
2m
Recognition area
Position
3 / 4
Height
Glass window (same as the semi-outdoor scene
with no walls)
Device
Light
Door
Wall
Person
Curtain
Device shall be installed in places avoiding backlight, side-light and strong light.
This place, 3m away from the window, or does not
FOV(V)
FOV(H)
Backlight, side-light or direct strong light, not
suitable for installation.
Other areas, install in suitable places according
to actual light impact.
Indoor
Door
Light
Wall/Shields
Indoor
Door
Light
Wall/Shields
Indoor
Light
Door
Door
Wall/Shields
Indoor
Door
Glass wall
Wall/Shields
Light
