3 / 4
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
Indoor
Door
Light
Wall/Shields
Indoor
Door
Light
Wall/Shields
Indoor
Door
Door
Wall/Shields
Indoor
Door
Wall/Shields
Light
Light
Illumination intensity
Test object
Light source
Device
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
small, may result the identity judgement.)
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-
dard light source, adjust the distance between
source light and test object, subject to the
illumination intensity of the object face at this
time.
Illumination intensity in actual scenarios
Reference to intensity
Intensity test
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.
500Lux,
overexposure
30 Lux, dim
100 Lux, bright
50 Lux, normal
300 Lux,
slight exposure
Back light
Side light
Light source is near to the object
Device stands between the light
source and object
Object stands between the
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
Strong light
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 shall be installed in places avoiding backlight, side-light and strong light.
Position
This place, 3m away from the window, or does not
Backlight, side-light or direct strong light,
not suitable for installation.
Other areas, install in suitable places according
to actual light impact.
Glass window (same as the semi-outdoor scene
with no walls)
Device
Light
Door
Wall
Person
Curtain
Glass wall
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
FOV(V)
Height
Camera vertical wide-angle
Camera horizontal wide-angle
Wall
1.4m
Device
Gate
User
2m
Recognition area
FOV(H)
Suggested installation height
(distance between the screen
and the ground) is 1.4m,
as the
re cog nizable body heig ht
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)
