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USGS

ISIS Application Documentation

butterworth

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Apply Butterworth filter for cube in fft frequency domain

Overview Parameters

Description

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Steven Lambright2008-10-17 Removed outdated examples from the documentation.
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File Modified: 02/21/2025 19:28:09
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Files: FROM

Description

Cube to filter

Type cube
File Mode input
Filter *.cub
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Files: TO

Description

The resultant cube

Type cube
File Mode output
Filter *.cub
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Parameter Info: CUTOFF

Description

The specified cutoff frequency.

Type double
Default 0.0
Minimum 0.0 (inclusive)
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Parameter Info: ORDER

Description

The order of the Butterworth filter.

Type integer
Default 1
Minimum 0 (inclusive)
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Parameter Info: BANDWIDTH

Description

This parameter is used when the type specified is "bandpass" or "bandstop".

Type double
Default 1.0
Minimum 0.0 (inclusive)
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Filter Type: TYPE

Description

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.
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