A region determination circuit (60) determines whether or not each of the pixels in an image is within a correction subject region in which the frequency of appearance of a pixel having a brightness that is equal to or less than a predetermined brightness level is equal to or less than a predetermined value. An offset level generation circuit (10) generates an offset level (Offset) on the basis of the brightness of the pixel that has been determined to be within the correction subject region. An offset subtraction circuit (1) subtracts the offset level (Offset) from the image signal (Yi) and generates an offset image signal (Yofst). A gain generation circuit (20) generates the gain with respect to the offset image signal (Yofst). A gain addition circuit (2) adds the gain to the offset image signal (Yofst) and generates a corrected image signal (Ya).