This layer (skeletonize) extracts skeletons from bitmap figures.

"src": [
"dst": "$sample2",
"action": "skeletonize",
"settings": {
"method": "thinning",
"classes": [

Each figure of class "cool-bitmap" will be reduced to 1 pixel wide representation. Each source mask (figure of shape "bitmap") produces one resulting mask (shape "bitmap").

It uses scikit-image as a backend, so three methods of skeletonization are provided. For more information, look here.

For large images it may be... not fast.


  • classes — list of classes to apply transformation. Only classes with shape "bitmap" are allowed.

  • method (type: enum ["skeletonization", "medial_axis", "thinning"]) — algorithm of processing.


Illustrated example of usage may be found here.