FreeMat

- Main Page
- Related Pages

vtkImageButterworthLowPass

Section: Visualization Toolkit Imaging Classes

# Usage

This filter only works on an image after it has been converted to frequency domain by a vtkImageFFT filter. A vtkImageRFFT filter can be used to convert the output back into the spatial domain. vtkImageButterworthLowPass the high frequency components are attenuated. Input and output are in doubles, with two components (complex numbers). out(i, j) = (1 + pow(CutOff/Freq(i,j), 2*Order));

To create an instance of class vtkImageButterworthLowPass, simply invoke its constructor as follows

      obj = vtkImageButterworthLowPass

# Methods

The class vtkImageButterworthLowPass has several methods that can be used. They are listed below. Note that the documentation is translated automatically from the VTK sources, and may not be completely intelligible. When in doubt, consult the VTK website. In the methods listed below, `obj` is an instance of the vtkImageButterworthLowPass class.

- `string = obj.GetClassName ()`
- `int = obj.IsA (string name)`
- `vtkImageButterworthLowPass = obj.NewInstance ()`
- `vtkImageButterworthLowPass = obj.SafeDownCast (vtkObject o)`
- `obj.SetCutOff (double , double , double )` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `obj.SetCutOff (double a[3])` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `obj.SetCutOff (double v)` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `obj.SetXCutOff (double v)` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `obj.SetYCutOff (double v)` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `obj.SetZCutOff (double v)` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `double = obj. GetCutOff ()` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `double = obj.GetXCutOff ()` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `double = obj.GetYCutOff ()` - Set/Get the cutoff frequency for each axis. The values are specified in the order X, Y, Z, Time. Units: Cycles per world unit (as defined by the data spacing).
- `double = obj.GetZCutOff ()` - The order determines sharpness of the cutoff curve.
- `obj.SetOrder (int )` - The order determines sharpness of the cutoff curve.
- `int = obj.GetOrder ()` - The order determines sharpness of the cutoff curve.