1. A method of determining a rotational orientation of an object, said method comprising the steps of: capturing an image of said object in an image processing system; performing a filtering operation on said image to produce a filtered image containing enhanced edge information for said image; rotating said filtered image by an incremental angle to produce a rotated image; projecting said rotated image onto an x-axis and y-axis defined relative to said image to form projected pixels image from an intersection of said x-axis and said y-axis with said rotated image; computing a score for a projection of said rotated image, said score corresponding to a sum of differences of pixel values for said projected pixels; performing said rotating step, said projecting step and said computing step for subsequent rotated images, each rotated image of said subsequent rotated images being rotated by a multiple of said incremental angle; and determining a peak score from said score for said rotated image projection and subsequent scores for said subsequent rotated image projections.