| OCR Text |
Show 1 50 cycle one content, notably due rapidly, such "Aliasing" as Moire blinking on and the it as of than higher of the frequency intensity sampling the changes situation staircase a signal displayable limit. under re-appear This patterns, off only large high spatial some result the to frequencies visually if edges. frequencies. spatial Even decomposition regions where to refers high spatial low contains frequencies containing The at as spectral a it that shows image drawn being are objects elements. picture two per the alias manifests fine edges, of itself detail etc. moves, Spatial Filtering avoid To be must displayed frequencies which given weighted to use of the would have property of the which displayable, frequencies processing correspond to a tells sin(2nX) X This is illustrated in The that weighting function figure 51. ideal spatial the on of form (intensities) spatial leaving theory such of sin(2nY) Y the the takes while intact. us remove a the of filter be to in a the filter completely eliminating high too are The element. picture function representable values function the be to to filtering Spatial frequencies signal high too are of average vicinity spatially filtered size. grid continuous the aliasing, the lower, digital would |
