ISIS Application Documentation
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Sharpen the features in a cube
| Overview | Parameters | Example 1 |
Description
This program sharpens the edges in the image. The method for sharpening
is done by applying a high pass filter to a cube and adding the filter
results back to the original image. In general, you will sharpen small
features with smaller boxcars and larger features with larger boxcars.
CategoriesRelated Applications to Previous Versions of ISISThis program replaces the following application existing in previous versions of ISIS:
Related Objects and DocumentsApplicationsHistory
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| 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 20:06:06 |
Parameter GroupsFiles
Boxcar Size
Boxcar Restrictions
Other
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| 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 20:06:06 |
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 |
|---|---|
| Default | 3 |
| 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 |
|---|---|
| Default | 3 |
| 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 statistics.
| 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 statistics.
| Type | double |
|---|---|
| Internal Default | Use all pixels |
| Greater Than | LOW |
Boxcar Restrictions: MINIMUM
Description
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) |
Other: PROPAGATE
Description
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 |
Example 13x3 Description
Use a 3x3 boxcar
Command Line
sharpen f=peaks.cub:4 t=sharpen
In this example the boxcar size is the default 3 by 3.
GUI Screenshot
Input Image
Output Image
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![Sharpen Gui](javascript:popUpNewWindow ("assets/image/sharpenGui.jpg",480, 450))
![Input image](javascript:popUpNewWindow ("assets/image/peaks.4.jpg",500, 500))
![Output image showing results of the sharpen application.](javascript:popUpNewWindow ("assets/image/sharpen.jpg",500, 500))
| 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 20:06:06 |