1. A method of correcting parallax error in images acquired from a plurality of pixel cell arrays, said method comprising: computing a plurality of either column sums or row sums of pixel signal values from each of the plurality of pixel cell arrays; computing an average pixel signal value corresponding to each of said plurality of sums; correlating the average pixel signal values of the plurality of pixel cell arrays; and shifting an image formed from at least one of the plurality of pixel cell arrays based on a result of the correlation.