3vr P-Series SmartRecorder, Installation Manual

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4. Lighting Level
Facial analysis requires even levels of lighting that clearly shows the detail in a face. Facial analysis requires light -
ing conditions that do not produce shadows and/or dark areas in the face (underexposure) and lighting condi -
tions that do not produce glare and/or washed-out areas in the face (overexposure). A face with lots of detail
visible and a wide range of dark and light pixels (referred to as “dynamic range”) is required for facial analysis.
Photo A –Good Lighting.
There are no areas of the face in shadow or glare. There is wide dynamic range - lots
of both light and dark areas within the face, and lots of detail is visible.
Photo B –Overexposed. There are no areas of shadow, but there are significant areas with glare (notice the
cheeks, nose and forehead). There is a narrower dynamic range - excessive washed-out areas with loss of detail.
Photo C –Marginally acceptable.
There are some areas of the face in mild shadow and the face appears some -
what darker than desired. There is marginally acceptable dynamic range - moderate amounts of both light and
dark areas within the face, and moderate amounts of detail are visible.
Photo D –Underexposed.
There are substantial areas of shadow and/or not enough light. There is a narrower
dynamic range - excessive dark areas with loss of detail.
Photo A –
Good lighting
Photo B
–
Overexposed
Photo D –
Underexposed
Photo C –
Marginally
acceptable