1. An image processing device that corrects an obtained image, comprising: an image acquisition unit that obtains the image; a region setting unit that sets a first region including a main object and a second region not including the main object on the image; an image characteristic amount calculation unit that calculates a first image characteristic amount respectively in the first region and the second region; a comparison unit that includes: a first sub-comparison unit configured to compare the first image characteristic amounts of the first region with a first threshold, and to compare the first image characteristic amounts of the second region with a second threshold; and a second sub-comparison unit configured to calculates a parameter according to a comparison result obtained by the first sub-comparison unit, and to compare the parameter with a third threshold; an image processing method setting unit that sets an image processing method to be applied to the image, from a plurality of image processing methods, on the basis of a comparison result obtained by the second sub-comparison unit; and an image characteristic adjustment unit that adjusts a second image characteristic amount of the obtained image using the method set by the image processing method setting unit.