1. A selector ( 502 ) for selecting a background motion vector for a pixel in an occlusion region of an image, from a set of motion vectors being computed for the image, the selector ( 502 ) comprising: computing means ( 510 ) for computing a model-based motion vector for the pixel on basis of a motion model being determined on basis of a part of ( 402 - 436 ) a motion vector field ( 400 ) of the image; comparing means ( 511 ) for comparing the model-based motion vector with each of the motion vectors of the set of motion vectors; and selecting means ( 512 ) for selecting a particular motion vector of the set of motion vectors on basis of the comparing and for assigning the particular motion vector as the background motion vector.