Patent ID: 8305458

Claim:
An image processing apparatus comprising: an image obtaining unit adapted to obtain an image having a plurality of colors, the image being generated using an image pickup element including a plurality of pixels; a shift amount obtaining unit adapted to obtain an amount of shift of light flux of a second color with respect to light flux of a first color, the amount of shift being caused by optical characteristics of a lens through which light flux that arrives at the image pickup element is transmitted; a shift correcting unit adapted to interpolate a signal level of the second color at aberration coordinates from signal levels of pixels having the second color around the aberration coordinates, the aberration coordinates representing a position that is shifted from a position of a pixel of interest by the amount of shift; a high-frequency extracting unit adapted to extract a high-frequency signal level of the first color of the pixel of interest in accordance with a degree of reduction in a high-frequency signal level in the signal level of the second color at the aberration coordinates, the reduction being caused by interpolation performed by the shift correcting unit; and an output unit adapted to output, as a signal level of a pixel of the second color in the pixel of interest, a signal level obtained by adding the signal level extracted by the high-frequency extracting unit to a signal level of a pixel of the second color calculated by the shift correcting unit.