Patent ID: 8502884

Claim:
An image processing apparatus comprising: a detecting unit which detects, for an image to be input, a band-like unevenness occurring along a direction substantially perpendicular to a scanning direction of an imaging sensor when the image was captured; a first calculating unit which calculates, as a first correction amount, a correction amount to correct the band-like unevenness; and a correcting unit which corrects the band-like unevenness in the image based on the first correction amount, wherein the detecting unit obtains a distribution of pixel values in the scanning direction by using a pixel value of a pixel, out of a plurality of pixels included in the image, included in at least one pixel column along the scanning direction, the detecting unit detects, as a pixel column where the band-like unevenness occurs, a pixel column which is along a direction perpendicular to the scanning direction and includes a pixel having a pixel value less than a threshold value from the distribution of pixel values in the scanning direction, and the first calculating unit calculates, based on a shape of the distribution of a part where a pixel value is less than the threshold value in the distribution of pixel values in the scanning direction, a first correction amount to correct a pixel value of each pixel included in the pixel column where the band-like unevenness occurs.