Image capturing device and image capturing method

摘要

An image capturing device has a light source 1 and a camera 4 that captures an image of a measurement subject 3 placed in an optical path that lies between said camera itself and said light source. A control unit 14 subtracts a plurality of frame images captured by said camera during an OFF period of said light source from a plurality of frame images captured by said camera during an ON period of said light source; the number of frame images captured by said camera during the OFF period being the same as that number of frame images obtained by said camera during the ON period and integrates the differences between their images. The light source may be a THz Laser and the method helps to eliminate background radiations.