ISIS Application Documentation
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Apply a spectral high pass filter to a cube
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Name | Description |
---|---|
FROM | Input file |
TO | Output spechighpass cube |
Name | Description |
---|---|
BANDS | Number of bands in boxcar |
Name | Description |
---|---|
LOW | Minimum valid DN |
HIGH | Maximum valid DN |
Input cube to filter
Type | cube |
---|---|
File Mode | input |
Filter | *.cub |
The resultant filtered cube
Type | cube |
---|---|
File Mode | output |
Pixel Type | real |
Filter | *.cub |
This is the total number of bands in the boxcar. It must be odd and can not exceed twice the number of bands 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 the average.
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 the average.
Type | double |
---|---|
Internal Default | Use all pixels |
Greater Than |
|
Example of usage of the spectral highpass filter.
Example GUI Screenshot of the GUI with parameters set to perform the spechighpass filter with a 15 band boxcar on the image CM_1514302573_1.ir.cub. |
Input image spectral graph before spechighpass filter
Parameter Name:
FROM This is the spectral plot of the center point of the image, (32, 32), and shows all bands, 1- 256. No averaging has been applied, this is clear partialy because of th extreme peaks visible in the first half. The peaks are related to values which differ significantly from the bands around them. |
Output image spectral graph after being filtered
Parameter Name:
TO This is the image after the filter. Although there are still sharp peaks, everything has been brought closer to zero. In the before image nearly all values are above zero, now the values are on either side of zero and are smaller. |
Example of usage of the spectral highpass filter.
Example GUI Screenshot of the GUI with parameters set to perform the spechighpass filter with a 63 band boxcar on the image CM_1516302573_1.ir.cub. |
Input image spectral graph before spechighpass filter
Parameter Name:
FROM This is the spectral graph of the input image at location (32, 32), notice the sharp peaks and all values greater than zero. |
Output image after being filtered
Parameter Name:
TO In this image the differences is that everything has been lowered except for the values already at zero. Some values which were positive are now negative as well. |
Stacy Alley | 2008-09-02 | Original version |
Mackenzie Boyd | 2009-06-04 | Added examples, modified documentation about boxcar size, added exception handling for too many bands |