1. An imaging device comprising: a pixel array configured to receive an image, said array comprising a plurality of first pixels each having a first photo-conversion device and a second photo-conversion device, said first photo-conversion devices configured to acquire an image signal during a first integration period, said second photo-conversion devices configured to acquire a plurality of image signals during said first integration period; a circuit for using said plurality of image signals generated by said second photo-conversion devices and detecting therefrom relative motion of the imaging device and an image during a portion of said first integration period and providing a signal representing said motion.