An image processing apparatus has an area sensor unit that reads image data corresponding to a plurality of frames shifted from each other by a shift of less than one pixel, an inclination angle acquiring unit that acquires an inclination angle with respect to a reference installation position of the area sensor, an angle correcting unit that corrects the inclination of the image data corresponding to a plurality of frames read by the area sensor unit by using the acquired inclination angle, and a high-resolution conversion unit that provides image data the resolution of which is higher than the resolution of the read image data by using the image data corresponding to a plurality of frames the inclination of which has been corrected by the angle correcting unit to perform interpolation processing.