BLC, HLC, WDR and DWDR

BLC (Back Light Compensation)
BLC (Back Light Compensation)
In images where a bright light source is behind the subject of interest, the subject would normally appear in silhouette. BLC allows the camera to adjust the exposure of the entire image to properly expose the subject in the foreground.
 
HLC (High Light Compensation)
Highlight compensation (HLC) is a technology used in CCTV/IP security cameras to deal with image overexposed with lights like headlights or spotlights. Security cameras' image sensors detect strong lights in video and reduce exposure on these spots to enhance the overall quality.
 
 
Wide Dynamic Range (WDR) is a term used in the surveillance camera industry to refer to high-dynamic-range imaging. Implies that the camera can handle bright and dark conditions and improve quality of freeze frame. this better than DWDR
 
 
What Is Digital Wide Dynamic Range? Digital Wide Dynamic Range gives the camera the ability to view Dark areas of the given image as well as extremely lighted portions of the image, or areas of high contrast.
 
 

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