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# Distance transform
<img src='https://g.gravizo.com/svg?
digraph G {
shift [fontcolor=white,color=white];
"binary image" -> "distance transform" -> "distance map";
"distance map" -> "values are distances";
}
'/>
## Activity: Explore distance transform
- Open image: xy_8bit_binary__two_objects.tif
- Learn:
- It matters what is foreground and what is background.
- The image data type limits the possible distance values.
- There is a difference between calibrated vs. pixel-based distance transforms.
## Actvity: Use distance map for automated distance measurements
- Open reference object image: xy_8bit_binary__single_object.tif
- Compute distance map
- Open label image: xy_8bit_labels__two_spots.tif
- Measure "intensity" of label image objects in distance map
- intensity is distance
## Activity: Use distance map for automated region selection
- Open reference object image: xy_8bit_binary__single_object.tif
- Compute distance map
- Threshold distance map to select regions
### Formative Assessment
TODO
### Learn more
TODO