High Dynamic Range refers to the number of distinct grey level that a camera can distinguish between. This is normally expressed as 'bit depth', where 8bit =256 levels, 10bit = 1024 and 12bit = 4096. There are a number of circumstances where an HDR camera may be required. It could be that the image analysis needs to differentiate between very subtle image details that a camera with a standard sensor cannot, or it might be that camera needs to have extremely high sensitivity or a very fast speed. This section also covers X-Ray sensitive cameras.
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