Wide Dynamic Range

Wide dynamic range
The Wide Dynamic Range (WDR) function of a camera
is intended to provide clear images even under back
light circumstances where intensity of illumination
can vary excessively, namely when there are both very
bright and very dark areas simultaneously in the field
of view of the camera. WDR enables the capture and display
of both bright areas and dark areas in the same frame,
in a way that there are details in both areas, i.e. bright
areas are not saturated, and dark areas are not too dark.
Usage of WDR
WDR cameras are commonly used in surveillance cameras, and
in some medical applications. In surveillance,The WDR allows
a camera to filter the intense back light surrounding a
subject and thus enhances the ability to distinguish features
and shapes on the subject. WDR cameras are usually recommended
for situations where light enters a premise from various angles
such as a multi-window room. A camera placed on the inside of
the room will be able to see through the intense sunlight or
artificial light coming in. If an indoor security camera is
pointed towards a window or an entrance door, you will see
the background washed out during daytime. This is very
common situation in restaurants and stores which have big
glass windows.