ISIS Application Documentation
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Remove periodic noise from a Viking image
Description
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Description
VIKNONOODLE removes periodic noise, in the sample direction, from VIKING
images. The images should be run through LEVEL1 before VIKNONOODLE is
run on the images. This program is to be run before any cropping. For
best results, use trim to remove unwanted data from the sides first. No data
that lies between the two noise locations will be affected.
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Parameter Groups
Files
| Name | Description |
|---|---|
| FROM | Input file to apply VIKNONOODLE to. |
| TO | Output cube |
Parameters
| Name | Description |
|---|---|
| TOLERANCE | Frequency magnitude tolerance level. |
Files: FROM
Description
The input cube with periodic noise in the sample direction.
| Type | cube |
|---|---|
| File Mode | input |
| Filter | *.cub |
Files: TO
Description
The resultant cube with the noise removed.
| Type | cube |
|---|---|
| File Mode | output |
| Pixel Type | real |
| Filter | *.cub |
Parameters: TOLERANCE
Description
The tolerance parameter is used to specify how strong the frequency must be to count as noise. The higher the tolerance level, the less likely the frequency will be cleaned. However, if the tolerance is too low, it may wipe out good data and some banding may occur around the noise location. (Note: most noise frequencies have a magnitude greater than 1.0).
| Type | double |
|---|---|
| Default | 0.5 |
History
| Jacob Danton | 2006-05-22 | Original version |
| Elizabeth Miller | 2006-07-24 | Moved from base to viking area |
| Brendan George | 2006-09-28 | Documentation fixes |
| Steven Lambright | 2007-12-14 | Fixed boundary condition where vectors went out of bounds |
| Debbie A. Cook | 2011-12-12 | Added a check for a line with no valid pixels and just copy the input line to the output in that case |