1. A method for motion estimation of a sequence of images comprising the steps of: a) determining one or more motion vectors representing movement of a camera or viewer position and direction between each pair of fields or frames in the sequence of images; b) determining a set of candidate motion vectors for deriving positions of objects in a field or frame from the positions of objects in the previous field or frame; c) adjusting the set of candidate motion vectors using the motion vectors representing movement of camera or viewer position; and d) deriving by motion estimation a set of motion vectors for the sequence of images using the adjusted set of candidate motion vectors.