Distance Transformation
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Creates a distance map to the segmentation regions in the input label map.

Input
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A binary label map of LABEL modality.

Output
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A float image with the same dimension as the input, containting in each pixel the distance of the current pixel in mm to the boundary of the represented object.

Description
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This algorithm can compute several kinds of distance maps, depending on the value of ``Mode``:

* **Outer** only computes the distances outside the object (the pixels inside the object are assigned the value 0.0).
* **Inner** only computes the distances inside the object (the pixels outside the object are assigned the value 0.0).
* **Both** computes both inner and outer distances.
* **Signed** similar to **Both** but inner distances are assigned negative values.