1. An image processing apparatus, comprising: an image acquisition unit that acquires an image; a correction unit that corrects pixel values of the image acquired by the image acquisition unit by using correction coefficients to produce a corrected image; an object recognition unit that recognizes an object in the corrected image; a storage unit that stores in advance standard color characteristics of a predetermined object which is a recognition target; a color characteristics acquisition unit that if the predetermined object is recognized by the object recognition unit, acquires color characteristics of the predetermined object; a comparison unit that compares the color characteristics of the predetermined object acquired by the color characteristics acquisition unit with the standard color characteristics of the same predetermined object stored in advance by the storage unit; and an updating unit that updates the correction coefficients used by the correction unit based on a result of comparison of the color characteristics and the standard color characteristics so as to reduce a difference between the color characteristics and the standard color characteristics.