1. An apparatus, comprising: a lens system operable to focus light from subfields of a scene onto respective capture areas of a focal plane; an imaging system having active regions each coincident with a respective one of the capture areas in the focal plane, the active regions being operable to cooperatively capture successive sets of contemporaneous local images from the light focused by the lens system; a saliency measurement module operable to derive respective saliency measures from respective ones of the local images; a local motion measurement module operable to determine respective local motion measures from comparisons of corresponding ones of the local images in ones of the contemporaneous local image sets; and a global motion determination module operable to produce a respective global motion measure for each of the contemporaneous local image sets based on the respective ones of the local motion measures and the respective ones of the saliency measures.