1. An image processing apparatus comprising: a geometric correction unit configured to generate a plurality of pieces of pixel value corrected image data having different pixel values based on object information of input image data; a synthesizer configured to select a pixel value to be applied to each pixel from the plurality of pieces of pixel value corrected image data to generate corrected image synthesized data; and a pseudo grayscale processor configured to perform a pseudo grayscale process on the corrected image synthesized data, wherein the geometric correction unit is further configured to determine a pixel value of coordinates of interest in the image data corresponding to a geometrically corrected pixel, based on object information of coordinate points in the surrounding of the coordinates of interest and a priority level of each piece of the object information, and then generate the plurality of pieces of pixel value corrected image data having different pixel values.