1. An apparatus for detecting the position of an object in one or more images captured by an image pickup device mounted on a vehicle, comprising: (a) a memory on which is stored a plurality of images captured by the image pickup device, including a first image of an object taken at a first time when the vehicle is balanced and a second image of the object captured at a second time; and (b) a controller operatively coupled to the memory and adapted to determine whether the second image was captured when the vehicle was not balanced, and to determine the position of the object in the second image based on the position of the object in the first image if the second image was captured when the vehicle was not balanced.