spatial frequency spectrum造句

More specifically, the projection optics can only capture a limited spatial frequency spectrum from the object ( photomask ).
With multi wave interference ( by inserting a diffuser into the optical path ) aperiodic patterns with defined spatial frequency spectrum can be originated.
The duration of suppression in both methods is maximized if the image being suppressed has low luminance contrast or a low spatial frequency spectrum.
Methods that have been suggested to provide some defence against the use of fake eyes and irises include changing ambient lighting during the identification ( switching on a bright lamp ), such that the pupillary reflex can be verified and the iris image be recorded at several different pupil diameters; analysing the 2D spatial frequency spectrum of the iris image for the peaks caused by the printer dither patterns found on commercially available fake-iris contact lenses; analysing the temporal frequency spectrum of the image for the peaks caused by computer displays.
It's difficult to find spatial frequency spectrum in a sentence. 用spatial frequency spectrum造句挺难的