Hello, For my PhD research, I have developed the BoundaryDelineation QGIS plugin that aims to facilitate manual digitization from remote sensing imagery. As an input, it requires object outlines obtained through image segmentation. I have tested different image segmentations in QGIS, but found that external approaches from computer vision provide better object outlines. For the purpose of cadastral mapping that requires to digitize along roads, buildings, rivers, fences, etc., I obtained accurate contours around visible objects from drone, aerial and satellite imagery with Multiscale Combinatorial Grouping (MCG) from Berkeley University. The code is open source ( https://www2.eecs.berkeley.edu/Research/Projects/CS/vision/grouping/mcg/#). However, it is partly pre-compiled for Matlab and does not work under Windows. In order to keep the geo-reference of input images, I have added two small scripts ( https://github.com/SCrommelinck/Delineation-Tool/tree/master/v3.0/1_image_segmentation). Here is a video that shows MCG results on rural aerial imagery as well as the use of the plugin: https://www.youtube.com/watch?v=GrDv8fW53Fs. MCG results on peri-urban drone imagery can be seen here: https://arxiv.org/abs/1904.12586
If this image segmentation would be included in QGIS, a user would not rely on processing input data externally before being able to use the BoundaryDelineation plugin. Furthermore, QGIS would incorporate and facilitate the use of a state of the art computer vision image segmentation. Segmenting an image into larger objects is an often applied first step in many mapping and classification procedures. My question is how to check whether someone would be interested to implement MCG in QGIS. My own programming skills are not elaborated enough. Should I open a feature request here: https://github.com/qgis/QGIS/issues, or is posting my suggestion to this mailing list the way to go? Best, Sophie
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