1. A method for operating an imaging system, comprising the steps of: viewing a scene and forming an image of at least one feature of interest within the scene, the feature of interest having a velocity V.sub.optical, converting the image to a charge packet within an imaging means having a two-dimensional array of radiation detectors; reading out the imaging means to form a frame of recovered video information, the frame including a video image corresponding to the charge packet; and using a characteristic of said video image to vary at least one electrical signal to cause the charge packet to move through the imaging means with a velocity V.sub.TDI, wherein V.sub.TDI is made approximately equal to V.sub.OPTICAL.