1. A method for providing a spatially compounded image from a plurality of individual image frames, comprising the steps of: dividing a current image frame into a plurality of sub-image regions; estimating local motion vectors of the respective sub-image regions between the current image frame and a previously compounded image frame; estimating global image motion vectors based on the estimated local motion vectors; transforming the current image frame geometrically to coincide with the previously compounded image frame using the estimated global image motion vectors; compounding the current image frame with the previously compounded image frame to provide a new compounded image; and displaying the new compounded image.