There are many surveillance situations that offer difficult lighting conditions. One particularly challenging
situation is when there is a lot of variation in light levels simultaneously within a scene, referred to
as wide dynamic range (WDR) scenes. Typical situations include:
> Surveillance of entrance doors with daylight outside and a darker indoor environment. This is, for
example, very common in retail and office applications.
> Vehicles entering a parking garage or tunnel, also with daylight outside and low light levels indoors.
> In city surveillance, transportation, perimeter surveillance and other outdoor applications, where
parts of the scene are in direct sunlight and other parts are in deep shadows.
> Vehicles with strong headlights, driving directly towards the camera.
> Environments with lots of reflected light, for example, in office buildings with many windows or
in shopping malls.