An image processing method includes acquiring a plurality of image data items by continuously capturing images of an object by an image capturing apparatus (S1), transmitting the plurality of image data items to a computing section (S2), computing image feature values each of which relates to positional information and information correlated with illumination conditions of each of the image data items by using the computing section (S3), comparing degrees of matching between reference image feature values, each of which corresponds to positional information and information correlated with illumination conditions, and the plurality of image data items (S4), and selecting, from the plurality of image data items, an image having positional information and illumination conditions that match the reference image feature values and outputting the image (S5).