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ISIS Documentation

butterworth

Apply Butterworth filter for cube in fft frequency domain

Applies a Butterworth filter to a cube. This filter is used on images in the frequency domain. Use the fft app to transform an image from a spacial to frequency domain and use the ifft app to transform from frequency to spacial.

Categories

History

Jacob Danton2005-11-28 Original version
Brendan George2006-09-21 Documentation fixes
Steven Lambright2008-05-12 Removed references to CubeInfo
Steven Lambright2008-10-17 Removed outdated examples from the documentation.

Parameters

Files

Cube to filter
Type cube
File Mode input
Filter *.cub

The resultant cube
Type cube
File Mode output
Filter *.cub

Parameter Info

The specified cutoff frequency.
Type double
Default 0.0
Minimum 0.0 (inclusive)

The order of the Butterworth filter.
Type integer
Default 1
Minimum 0 (inclusive)

This parameter is used when the type specified is "bandpass" or "bandstop".
Type double
Default 1.0
Minimum 0.0 (inclusive)

Filter Type

This is the type of filter to be performed on the input.
Type string
Default LOWPASS
Option List:
Option Brief Description
LOWPASSLowpass filter Applies a lowpass filter to an image in the frequency domain.
HIGHPASSHighpass filter Applies a highpass filter to an image in the frequency domain.
BANDPASSBandpass filter Applies a bandpass filter to an image in the frequency domain.
BANDSTOPBandstop filter Applies a bandstop filter to an image in the frequency domain.