Sobel filter

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.
• 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.

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)