1. An image processing apparatus that reduces noise in a row in a reading direction from an original image of an object photographed with an x-ray, the image processing apparatus comprising: a first unit configured to extract a high-frequency component from the original image; a second unit configured to extract an edge component of the object from the high-frequency component; and a third unit configured to acquire an image in which the noise in a row is reduced from the original image based on the high-frequency component and the edge component.