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65
5.4.2 Nighttime
If you found recognition results to be less optimal at night, you can use extra IR LED tubes as
a lighting aid for the camera or create extra face data under IR LED illumination. Both
methods can be applied to achieve optimal face recognition results at night.
Figure 5-6
Extra IR LED Tubes: Install additional IR LED tubes at the surveillance site to illuminate
the recognition range.
Internal IR LED only
With the aid of
extra IR LED Tube
Relying solely on the internal IR
LED can cause overexposure,
which may lead to misrecognition
Increasingly better recognition
results occur under stable
illumination of extra IR LED tubes.
Figure 5-7
Enroll face data under special light conditions: Enroll additional face data for objects
under IR LED illumination. See 5.5 Enrolling Face Data.
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