Find Contours
This layer (find_contours) extracts contours from bitmaps and stores results as polygons.
"src": [
"dst": "$sample2",
"action": "find_contours",
"settings": {
"classes_mapping": {
"my-mask": "found-contours"
For each figure of class "my-mask" this will find contours (with OpenCV findContours), and the found contours will be stored as objects of shape "polygon" (class "found-contours").
Holes in source masks produce holes in polygons (with two-level hierarchy of borders).


  • classes_mapping — dict where keys are existing classes of shape bitmap, and values are new names of classes.


Example of usage may be found here.
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