1. An image processing apparatus comprising: an image acquiring part for acquiring a first image and a second image; a shading corrector for performing a shading correction on each of said first image and said second image acquired by said image acquiring part; a position adjuster for performing positioning of said first image and said second image that have been subjected to the shading correction by said shading corrector; and an image generator for generating a synthesized image of said first image and said second image that have been subjected to the positioning by said position adjuster.