An Investigation of Photosensor Aperture Shaping in Facsimile Cameras |
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aliased signal aliasing are analyzed analyzed to establish ANGULAR SPATIAL FREQUENCY aperture frequency response aperture transmission azimuth sampling interval azimuth step bandlimited bandpass characteristics of aliasing Circle Diamond circular photosensor aperture convolution cycles/radian designed to spectrally electron beam equation establish quantitative bounds Facsimile camera images field of view Figure Fourier transform Huck imaging process instantaneous field INVESTIGATION OF PHOTOSENSOR Langley Research Center lens point spread less aliasing light beam line-scan direction line-scan sampling line-scan spacing means for reducing NASA objective lens optical system response optical-mechanical scanner Optical-mechanical scanning techniques passband Performing Organization photodetector photosensor aperture shapes plane intensity distribution point spread function radians reconstructed image reducing this degradation sampling rate scans per instantaneous scene brightness scene information sensor aperture severely degraded shaping and line-scan side bands sinc function spatial characterization Spatial outline spectrally or radiometrically taneous field Television trade-off transform variables variations in scene vertical vidicon