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a Fourier lens, adapted to collect radiation emitted from a point and to separate the collected radiation into. In incoherent spatial filtering as in coherent filtering,. the position of a spatial frequency in.. displacement of the filter. Upon Fourier transforming. High or low pass filter the Fourier spectrum of a %% two-dimensional image.. If type is %% freq: param1 is the radius of the circular spatial filter,. span class=fFile Format:span PDFAdobe Acrobat LESSOIREES.US - a as HTMLa Descriptors : *VISUAL PERCEPTION, *SPATIAL FILTERING, FOURIER TRANSFORMATION, SPATIAL DISTRIBUTION,
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