WDR (Wide Dynamic Range) function is intended to provide clear images even under back light circumstances when there are both very bright and very dark areas simultaneously in the field of view of the camera.
In the video there are extremely bright areas and dark areas where a person is in front of a bright window. A typical camera would produce an image where objects is hard to be visible. Wide dynamic range solves this to enable objects in both bright and dark areas to be visible.
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