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Wide dynamic range
Wide dynamic range (WDR) describes an attribute of an imaging system that can record greater scene details, from shadows to highlights than normal. Having "wide dynamic range" is a relative term that can describe both the capability of a sensor or other imaging system, as well as the contents of an image file containing such data. The amount of dynamic range in an image which would qualify as "wide" changes over time as new systems are developed. WDR is desirable for photography and video-based systems due to its greater latitude in manipulating images.
==Applications==
Cameras with wide dynamic range capability are commonly used in surveillance cameras, video systems, and some medical applications. In surveillance, WDR is intended to provide clear images even under backlighting, where the intensity of illumination varies a lot—namely when there are very bright and very dark areas simultaneously in the camera's field of view. WDR allows an imaging system to correct for 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 a common occurrence in restaurants and stores with large glass windows.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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