Image capturing device and image capturing method

摘要

The present invention is applied for an image capturing device having a light source and a camera that captures an image of a measurement subject placed in an optical path that lies between said camera itself and said light source. The image capturing device according to the present invention includes a control unit that 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.

主权项

1. An image capturing device having a light source and a camera that captures an image of a measurement subject placed in an optical path that lies between said camera itself and said light source, comprising:
a control unit that 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; a first pulse circuit that generates a first pulse sequence; a second pulse circuit that generates a second pulse sequence based on an image capturing timing signal that represents an image capturing timing of said camera, said second pulse sequence having a lower frequency than does the image capturing timing signal; an AND circuit that performs an AND operation for said first pulse sequence and said second pulse sequence; and a drive circuit that drives said light source based on a third pulse sequence that is a calculation result of the AND operation of said AND circuit.