Gaussian filter
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The Gaussian smoothing filter is used for noise reduction and removing details. The filter is simialr to the arithmetic mean filter but it uses a different kernel that represents the shape of a 2D Gaussian distribution. | The Gaussian smoothing filter is used for noise reduction and removing details. The filter is simialr to the arithmetic mean filter but it uses a different kernel that represents the shape of a 2D Gaussian distribution. | ||
| − | * In the search engine of the Processing Toolbox, type '''Smoothing''' and select '''Smoothing(gaussian)''' under Image Filtering of the Orfeo Toolbox. | + | * In the search engine of the Processing Toolbox, type '''Smoothing''' and select '''Smoothing (gaussian)''' under Image Filtering of the Orfeo Toolbox. |
* Under the Parameters tab, select a single band or a multiband file as input layer. | * Under the Parameters tab, select a single band or a multiband file as input layer. | ||
* Select '''gaussian''' from the drop-down list as Smoothing Type. | * Select '''gaussian''' from the drop-down list as Smoothing Type. | ||
* Adjust the '''Radius''' of a circular element in pixel size. | * Adjust the '''Radius''' of a circular element in pixel size. | ||
[[File:Qgis_smooth_gauss.png|400px]] | [[File:Qgis_smooth_gauss.png|400px]] | ||
| − | + | {| class="wikitable" | |
| + | |style="border: 0pt" | [[file:Qgis_campus_pansharp.png|thumb|left|450px|'''Figure A:''' Input image: pansharpend Sentinel-2 composite (RGB=B7,B6,B5), University Göttingen Campus North]] | ||
| + | |style="border: 0pt" | [[file:Qgis_campus_gaussian.png|thumb|center|450px|'''Figure B:''' Output image: Gaussian filtered Sentinel-2 composite (RGB=B7,B6,B5), University Göttingen Campus North]] | ||
| + | |} | ||
[[category:Spatial Filtering]] | [[category:Spatial Filtering]] | ||
Revision as of 13:54, 20 November 2017
The Gaussian smoothing filter is used for noise reduction and removing details. The filter is simialr to the arithmetic mean filter but it uses a different kernel that represents the shape of a 2D Gaussian distribution.
- In the search engine of the Processing Toolbox, type Smoothing and select Smoothing (gaussian) under Image Filtering of the Orfeo Toolbox.
- Under the Parameters tab, select a single band or a multiband file as input layer.
- Select gaussian from the drop-down list as Smoothing Type.
- Adjust the Radius of a circular element in pixel size.
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