[Insight-users] Distance to point in connected object

[Kevin H. Hobbs]

Is there any way to tell how far the pixels of an object are from a
point within that object without the path leaving the object? I don't
mean "as the crow flies" but following roads.

I know that's a sort of a bad description maybe some ASCII art will
help.

If I have a segmented image like this.

-------------------
|                 |
|         11      |
|          1      |
|    111   1      |
|   11111111111   |
|    111          |
|                 |
-------------------

I pick a point in the middle of the blob in the lower left. I want the
pixels relabeled like this.
-------------------
|                 |
|         98      |
|          7      |
|    212   6      |
|   21012345678   |
|    212          |
|                 |
-------------------
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