1. An image processing apparatus comprising: a partial image data generator which generates a plurality of partial image data pertaining to a plurality of partial images of an object respectively, one partial image being partially overlapped another partial image in a boundary portion; a boundary image data generator which generates boundary image data pertaining to the boundary portion based on image data pertaining to the respective overlapped portions; and an image synthesizer which synthesizes the plurality of partial image data by way of the generated boundary image data to generate image data pertaining to a single image of the object.