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aliased noise aliased signal associated data density average value azimuth sampling rate binits bits camera passband camera signal Contour plot contours of constant convolution density h electrical filters electro-optical systems electronic noise elevation and azimuth Fellgett and Linfoot Figure film cameras fixed data density formulated Fourier transform frequency response frequency-response shapes function of sampling Gaussian given by equation Huck imaging system information capacity information density isoplanatism patch K/ne line-scan imaging process Linfoot ref minus its average noise components number of quantization object radiance optical filters optical-mechanical line-scan devices optical-mechanical line-scan imaging passband F photon noise photosensor plot of information power spectral density pqeF probability density function proper signal quantization interval quantization noise radiance distribution radiation random variable sampling rates 1/X scan scene radiance shot noise signal and noise signal frequency spectrum signal-to-noise ratio solid angle spatial frequency statistical statistically independent steradian sufficient sampling three contours undersampling Wiener spectrum