1. An image processing device comprising: one or more processors operable to: receive image data generated by an imaging element, wherein the imaging element comprises: a plurality of first pixels and a plurality of second pixels adjacent to the plurality of first pixels, wherein the image data includes a luminance value for each of the plurality of first pixels and the plurality of second pixels; correct a color mixture of each of the plurality of second pixels based on a change value of luminance of a corresponding second pixel of the plurality of second pixels and an amount of light leaked from one or more of the plurality of first pixels to the corresponding second pixel, wherein the amount of light leaked is based on the luminance value of each of the one or more of the plurality of first pixels; and calculate a sensitivity correction coefficient for each of the plurality of second pixels based on a luminance value of each of one or more pixels of a plurality of third pixels not adjacent to the plurality of first pixels and the corrected color mixture of the corresponding second pixel of the plurality of second pixels.