1. An image correction apparatus for correcting an input image on a basis of a correction amount calculated from the input image, the image correction apparatus comprising: a brightness determining unit that calculates a feature value of average brightness of the input image from pixel values of pixels in the input image and determines whether the calculated feature value is equal to or greater than a first threshold; a counting unit that counts the number of pixels having a value equal to or less than a second threshold in the input image that is determined, using the brightness determining unit, to be a bright image with the feature value equal to or greater than the first threshold; an average brightness calculating unit that calculates a feature value of average brightness from pixel values of the pixels counted by the counting unit; and an image correction unit that determines the correction amount, on a basis of whether the feature value calculated by the average brightness calculating unit is equal to or greater than a third threshold or whether, from among the total number of the pixels counted by the counting unit, the number of the pixels having the value equal to or greater than the third threshold is equal to or greater than a fourth threshold, and corrects the input image using the determined correction amount.