1. An image data reduction method for use with an input video signal representing a relatively high-spatial-resolution, wide-field-of-view image that is comprised of a first given number of pixels, said method comprising the steps of: first processing said input video signal to derive therefrom (1) a certain output video signal representing a derived relatively low-spatial-resolution image having a given field-of-view that corresponds to the field of the image represented by said input video signal, said image represented by said certain video signal being comprised of a second given number of pixels smaller than said first given number, and (2) at least one other output video signal representing a derived image having said given field-of-view, said image represented by said one other output video signal exhibiting a resolution equal to or less than said relatively high-spatial-resolution image represented by said input video signal but larger than said relatively low-spatial-resolution derived image represented by said certain output video signal, and said derived image represented by said one other output video signal being comprised of a number of pixels that is equal to or less than said first given number but larger than said second given number; and then further processing said one other output video signal to reduce the number of pixels of the derived image represented thereby by passing a spatially-localized subset of pixels thereof through a spatial window, said subset being comprised of no greater number of pixels than said second given number.