to the intensity of radiation sensed by the imager at the corresponding center point a ij b ij etc it may not be possible to use multiple image registration to generate subpixel video data this may occur for example when objects to be viewed in the scene are moving so fast in comparison with the rate at which subsequent video frames are generated that there is insufficient correlation of the fast moving objects between subsequent video frames in this special situation image interpolation and zoom may be used to generate the subpixels instead of multiple image registration referring to fig4 a subpixel of video data is generated from a single video frame the exemplary portion of the video frame a of fig4 comprises a plurality of stored words of video data in which only the words corresponding to pixel center points a 12 a 21 and a 32 represent a non zero intensity corresponding to the shaded areas of the video frame a of fig4 image interpolation is achieved by estimating the value of a point located between pixels the image data is interpolated between the pixels to achieve a linear transition between the three points a 12 a 21 and a 32 as illustrated in fig4 in the heavier solid line the resulting interpolated image is represented in cross hatching in fig4 the new interpolated image corresponding to the cross hatched area contains more information than the old image corresponding to the shaded.