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aliased signal aliasing are analyzed aliasing degradation analyzed to establish ANGULAR SPATIAL FREQUENCY aperture transmission azimuth sampling interval azimuth step bandlimited bandpass circular photosensor aperture convolution cosine aperture designed to spectrally electron beam equation establish quantitative bounds facsimile cam Facsimile camera images field of view Figure Fourier transform Frequency response section Huck imaging process instantaneous field Langley Research Center less aliasing light beam line-scan direction line-scan sampling line-scan spacing means for reducing NASA NORMALIZED ANGULAR SPATIAL objective lens optical system response optical-mechanical scanner Optical-mechanical scanning techniques passband Performing Organization photodetector photosensor aperture shapes point spread function Realizability of Aperture reconstructed image reducing this degradation reduction of aliasing sampling rate scans per instantaneous scene brightness scene information sensor aperture severely degraded shaping and line-scan SHAPING IN FACSIMILE sidebands spatial characterization Spatial outline spectrally or radiometrically techniques in facsimile Television trade-off transform variables variations in scene vertical vidicon