Sobel filter

Latest revision as of 16:00, 15 November 2019

The Sobel filter creates an image emphasising edges.

In search engine of Processing Toolbox, type Edge extraction and select EdgeExtraction under Feature Extraction of Orfeo Toolbox.
Under the Parameters tab, select a single band or a multiband file as input layer.
Select a specific band number in case of a multiband file.
Select sobel as Edge Feature.

Figure A: Input image: Sentinel-2 synthesis image based on 4 10m bands, (University Göttingen Campus North)	Figure B: Output image: Sobel filtered Sentinel-2 synthesis image (University Göttingen Campus North)

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 The Sobel filter creates an image emphasising edges.
-* In the search engine of the Processing Toolbox, type '''Sobel''' and select '''EdgeExtraction (sobel)''' under Feature Extraction of the Orfeo Toolbox.
+* In search engine of Processing Toolbox, type '''Edge extraction''' and select '''EdgeExtraction''' under Feature Extraction of Orfeo Toolbox.
 * Under the Parameters tab, select a single band or a multiband file as input layer.
 * Select a specific band number in case of a multiband file.
-* Select '''sobel''' as Smoothing Type.
+* Select '''sobel''' as Edge Feature.
 [[File:Qgis_edge_sobel.png|400px]]
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