ISIS Application Documentation
trimfilter | Printer Friendly View | TOC | Home |
Apply a trim filter to a cube
| Overview | Parameters | Example 1 |
Description
This program convolves an NxM boxcar through a cube and trims (or NULLs)
pixels. A pixel at the center of the boxcar is trimmed in the output cube
if the number of valid pixels inside the boxcar is less than a user
specified minimum. Valid pixels are defined as those which are 1) not
special pixels and 2) inside the range of the LOW and HIGH parameters.
This is a very powerful trimming tool although much
thought must be put into the parameters in order to obtain the optimal
trimming results.
CategoriesRelated Applications to Previous Versions of ISISThis program replaces the following application existing in previous versions of ISIS:
Related Objects and DocumentsApplicationsHistory
|
| U.S. Department of the Interior | U.S. Geological Survey ISIS | Privacy & Disclaimers | Astrogeology Research Program To contact us, please post comments and questions on the USGS Astrogeology Discussion Board To report a bug, or suggest a feature go to: ISIS Github File Modified: 02/21/2025 19:28:14 |
Parameter GroupsFiles
Boxcar Size
Boxcar Restrictions
|
| U.S. Department of the Interior | U.S. Geological Survey ISIS | Privacy & Disclaimers | Astrogeology Research Program To contact us, please post comments and questions on the USGS Astrogeology Discussion Board To report a bug, or suggest a feature go to: ISIS Github File Modified: 02/21/2025 19:28:14 |
Boxcar Size: SAMPLES
Description
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 |
Boxcar Size: LINES
Description
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 |
Boxcar Restrictions: LOW
Description
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 counts.
| Type | double |
|---|---|
| Internal Default | Use all pixels |
| Less Than | HIGH |
Boxcar Restrictions: HIGH
Description
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 counts.
| Type | double |
|---|---|
| Internal Default | Use all pixels |
| Greater Than | LOW |
Boxcar Restrictions: MINOPT
Description
This parameter determines whether the minimum parameter is to be interpreted as a count of pixels, or a percentage of all pixels in the boxcar.
| Type | string | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Default | COUNT | |||||||||
| Option List: |
|
Boxcar Restrictions: MINIMUM
Description
This is the minimum number of valid pixels which must occur inside the NxM boxcar in order to preserve the output pixel. For example, a 3x5 boxcar has 15 pixels inside. If MINIMUM=10 then the trimming will occur if there are 9 or less 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 | double |
|---|---|
| Default | 1 |
| Minimum | 1 (inclusive) |
Example 1run a trim filter Description
This example shows a trimfilter operation.
Command Line
trimfilter f=../IN/lo880.crp.cub t=OUT/trmfltr s=1 li=301 high=241 min=95
trimfilter a Lunar Orbiter image.
GUI Screenshot
Input Image
Output Image
|
![trimfilter Gui](javascript:popUpNewWindow ("assets/image/trimfilterGui.jpg",463, 368))
![Input image](javascript:popUpNewWindow ("assets/image/lo880.crp.jpg",485, 400))
![Output image showing results of the trimfilter application.](javascript:popUpNewWindow ("assets/image/trmfltr.jpg",485, 400))
| U.S. Department of the Interior | U.S. Geological Survey ISIS | Privacy & Disclaimers | Astrogeology Research Program To contact us, please post comments and questions on the USGS Astrogeology Discussion Board To report a bug, or suggest a feature go to: ISIS Github File Modified: 02/21/2025 19:28:14 |