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What units is the number in strel('disk', 22)?

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Simran Parkhe
Simran Parkhe on 16 Sep 2019
Edited: Guillaume on 16 Sep 2019
dilated = imdilate(ImagetoDilate,strel('disk', 22));
I have this line in my code to dilate the image, but I was wondering what units the 22 is? It says it is the radius but is it measured in centimeters, percentage, pixels or something else?

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Accepted Answer

Walter Roberson
Walter Roberson on 16 Sep 2019
Edited: Walter Roberson on 16 Sep 2019
Pixels.
Or more correctly, memory locations, as the result is used in multiple contexts and makes no attempt to handle multiple color planes.

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Guillaume
Guillaume on 16 Sep 2019
You can easily look at the structuring element
>> s = strel('disk', 22)
s =
strel is a disk shaped structuring element with properties:
Neighborhood: [43×43 logical]
Dimensionality: 2
and you can see that the disk overlaps 43x43 pixels.
As for it being a disk:
>> imagesc(s.Neighborhood); colormap([0 0 0; 0.8 0.8 0.8]); axis('off')

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