I am looking for QGIS function to extract (or detect) edge from a raster, which was referred in here, How to digitize a raster automatically as answer by @MappaGnosis.
The name could have changed since then, or it may have been integrated into other tool... I cannot find it in my QGIS Processing Toolbox (2.14.10 and 2.18.2).
There are similar tools such as GRASS "i.zc Zero-crossing" and SAGA "Gaussian filter", but I am hoping to find this QGIS geoalgorithm.
Answer
The Edge Extraction tool may have been moved to the Orfeo Toolbox as this focuses on image analysis. The Orfeo Toolbox contains a number of edge extraction tools using various methods such as:
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