Isis 3 Application Documentation
Apply Butterworth filter for cube in fft frequency domain
Overview
Parameters
Example 1
Example 2
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 Danton 2005-11-28
Original version
Brendan George 2006-09-21
Documentation fixes
Steven Lambright 2008-05-12
Removed references to CubeInfo
Parameter Groups
Files
Name
Description
FROM Input file
TO Output cube
Parameter Info
Filter Type
Name
Description
TYPE Type of filter
Files :
FROM
Description
Cube to filter
Type
cube
File Mode
input
Filter
*.cub
Files :
TO
Description
The resultant cube
Type
cube
File Mode
output
Filter
*.cub
Parameter Info :
CUTOFF
Description
The specified cutoff frequency.
Type
double
Default
0.0
Minimum
0.0
(inclusive)
Parameter Info :
ORDER
Description
The order of the Butterworth filter.
Type
integer
Default
1
Minimum
0
(inclusive)
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)
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
LOWPASS Lowpass filter
Applies a lowpass filter to an image in the frequency domain.
HIGHPASS Highpass filter
Applies a highpass filter to an image in the frequency domain.
BANDPASS Bandpass filter
Applies a bandpass filter to an image in the frequency domain.
BANDSTOP Bandstop filter
Applies a bandstop filter to an image in the frequency domain.
Example 1
3x3 median filter
Description
A 3x3 boxcar running of the median filter
Command Line
butterworth mode from=peaks.cub to=peaksMedian1.cub samples=3 lines=3
Runs a 3x3 mode filter on peaks.cub and stores the output in peaksMedian1.cub
Input Image
The image before filtering
Image before filtering
Parameter Name:
FROM
This is the original cube before any filters are applied.
Output Image
The image after filtering
Image after filtering
Parameter Name:
TO
This is the cube after a 3x3 median filter is applied.
Example 2
25x25 median filter
Description
A 25x25 boxcar running of the median filter
Command Line
butterworth mode from=peaks.cub to=peaksMedian2.cub samples=25 lines=25
Runs a 25x25 filter on peaks.cub and stores the output in peaksMedian2.cub
Input Image
The image before filtering
Image before filtering
Parameter Name:
FROM
This is the original cube before any filters are applied.
Output Image
The image before filtering
Image before filtering
Parameter Name:
TO
This is the cube after a 25x25 median filter is applied.
