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package require vtk
# This scripts shows a compressed spectrum of an image.
# Image pipeline
vtkPNGReader reader
reader SetFileName "$VTK_DATA_ROOT/Data/fullhead15.png"
vtkImageFFT fft
fft SetInputConnection [reader GetOutputPort]
fft ReleaseDataFlagOff
#fft DebugOn
vtkImageMagnitude magnitude
magnitude SetInputConnection [fft GetOutputPort]
magnitude ReleaseDataFlagOff
vtkImageFourierCenter center
center SetInputConnection [magnitude GetOutputPort]
vtkImageLogarithmicScale compress
compress SetInputConnection [center GetOutputPort]
compress SetConstant 15
vtkImageViewer2 viewer
viewer SetInputConnection [compress GetOutputPort]
viewer SetColorWindow 150
viewer SetColorLevel 170
vtkRenderWindowInteractor viewInt
viewer SetupInteractor viewInt
viewer Render
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