Find Contours

This layer (find_contours) extracts contours from bitmaps and stores results as polygons.

{
"src": [
"$sample1"
],
"dst": "$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).

Settings

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

Example

Example of usage may be found here.