1. Image processing method, comprising: providing a sequence of at least two image frames calculating a motion vector representing relative movement of at least a part of said image frames, repositioning at least said part in the image frames in accordance with the calculated motion vector, combining the image frames to form a combined image frame, dividing the image frames into blocks, calculating a block motion vector representing relative movement of each block, reducing the size of each block from an initial size to a reduced size when the motion vector calculated for a block of an initial size deviates more than a threshold amount from a global motion vector, repositioning each block in accordance with the calculated block motion vector and combining the blocks to form combined blocks in order to obtain the combined image frame.