ISIS Application Documentation
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Apply a variance or standard deviation filter to a cube
Description
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Examples
History
Name | Description |
---|---|
FROM | Input file |
TO | Output svfilter cube |
Name | Description |
---|---|
FILTER | Filter type |
Name | Description |
---|---|
SAMPLES | Number of samples in boxcar |
LINES | Number of lines in boxcar |
Name | Description |
---|---|
LOW | Valid minimum pixel |
HIGH | Valid maximum pixel |
MINIMUM | Minimum boxcar pixel count |
Name | Description |
---|---|
PROPAGATE | Propagate special pixels |
Input cube to filter
Type | cube |
---|---|
File Mode | input |
Filter | *.cub |
The resultant filtered cube
Type | cube |
---|---|
File Mode | output |
Pixel Type | real |
The output of the filter operation is either the variance value or the standard deviation value.
Type | string | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Default | VARIANCE | |||||||||
Option List: |
|
This is the total number of samples in the boxcar. It must be odd and can not exceed twice the number of samples in the cube. In general, the size of the boxcar does not cause the program to operate significantly slower.
Type | integer |
---|---|
Minimum | 1 (inclusive) |
Odd | This value must be an odd number |
This is the total number of lines in the boxcar. It must be odd and can not exceed twice the number of lines in the cube. In general, the size of the boxcar does not cause the program to operate significantly slower.
Type | integer |
---|---|
Minimum | 1 (inclusive) |
Odd | This value must be an odd number |
Valid minimum pixel value that will be used in boxcar computation. If a pixel value is less than LOW then it will not be used when computing boxcar statistics.
Type | double |
---|---|
Internal Default | Use all pixels |
Less Than |
|
Valid maximum pixel value that will be used in boxcar computation. If a pixel value is greater than HIGH then it will not be used when computing boxcar statistics.
Type | double |
---|---|
Internal Default | Use all pixels |
Greater Than |
|
This is the minimum number of valid pixels which must occur inside the NxM boxcar for filtering to occur. For example, 3x5 boxcar has 15 pixels inside. If MINIMUM=10 then the filter will occur if there are 10 or greater valid pixels. A valid pixel is one that is not special (NULL, LIS, etc) and is in the range defined by LOW to HIGH.
Type | integer |
---|---|
Default | 1 |
Minimum | 1 (inclusive) |
This option is used to define how special pixels are handled. If the center pixel of the boxcar is a special pixel it will be propagated or set to NULL depending on the value of this parameter.
Type | boolean |
---|---|
Default | TRUE |
run svfilter
Example Gui Screenshot of GUI with parameters filled in to perform an svfilter operation on the input image. |
Input image for svfilter
Parameter Name:
FROM This is the input image for the svfilter examples. |
Output image for svfilter
Parameter Name:
TO This is the output image that results from STDDEV filter. |
run svfilter
Example Gui Screenshot of GUI with parameters filled in to perform an svfilter operation on the input image. |
Input image for svfilter
Parameter Name:
FROM This is the input image for the svfilter examples. |
Output image for svfilter
Parameter Name:
TO This is the output image that results from VARIANCE filter. |
Eric Eliason | 1988-05-20 | Original version |
Tracie Sucharski | 2002-08-13 | Ported to Isis 3.0 |
Jeff Anderson | 2002-11-26 | Fixed bug which disallowed the standard deviation filter |
K Teal Thompson | 2002-12-03 | Add examples. |
K Teal Thompson | 2003-03-28 | Make images smaller. |
Stuart Sides | 2003-04-04 | Fixed problem with isiscvs not checking in the thumb and image directories. |
Kim Sides | 2003-05-13 | Added application test |
Stuart Sides | 2003-05-16 | Modified schema location from astogeology... to isis.astrogeology..." |
Stuart Sides | 2003-07-29 | Modified filename parameters to be cube parameters where necessary |