1. A method of motion estimation to provide output motion vectors, comprising the steps in a processor of: comparing input images in a sequence of images at a first spatial resolution to determine first spatial resolution motion vectors that describe pixel positional differences between said input images, comparing said input images at a second spatial resolution which is different from said first spatial resolution to determine second spatial resolution motion vectors that describe pixel positional differences between said input images, deriving a measure of motion vector confidence for at least one selected from the group of the first spatial resolution motion vectors and the second spatial resolution motion vectors, and selecting at least once per image between the first spatial resolution motion vectors and the second spatial resolution motion vectors to provide the output motion vectors, according to said measure of motion vector confidence.