[PD] tracking multiblob with constant ID

[Jack]

Do you know if there is an external to track multiblob with a constant
ID (the ID doesn't change in the time when two or more blobs move).
For example, with [pix_multiblob], the ID of the blob is given by its
position relative to the lower left corner (or i'm wrong), so it is not
good for my application.
Thanx.
++

Jack


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