Field of the Invention
The present invention relates to an image acquisition apparatus including a fiber optic member and an imaging device, and an image acquisition method.
Related Background Art
In image acquisition by a solid-state imaging device including a plurality of pixels, a fixed pattern noise (FPN) caused by a sensitivity variation in each pixel due to a pixel structure, an imaging characteristic, and the like of the imaging device is generated in an acquired image. Such a fixed pattern noise becomes a cause of deterioration in an image acquired by the imaging device.
As a method of suppressing an influence of such a fixed pattern noise, a method called flat field correction (FFC) is proposed. The flat field correction is sensitivity correction for each pixel of an image acquired by an imaging device, and correction is performed in such a manner that an output from a pixel with low sensitivity becomes high and an output from a pixel with high sensitivity becomes low, whereby an image with sensitivity being uniform in the whole image is acquired (see, for example, Patent Document 1).    Patent Document 1: Japanese Patent Application Laid-Open Publication No. 2014-131619    Patent Document 2: Japanese Patent Application Laid-Open Publication No. H10-282243    Patent Document 3: Japanese Patent Application Laid-Open Publication No. 2003-21732    Patent Document 4: Japanese Patent Application Laid-Open Publication No. 2005-259176