Why disk structuring element of disk is 4? It's usually 3 or 21
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DGM on 20 Jul 2022
Edited: DGM on 20 Jul 2022
The size of the structuring element can be whatever is suitable for the task at hand. That's why it's user-specified. While strel() accepts this parameter as an integer-valued radius, bear in mind that the actual structuring element will always have odd diameter. In that sense, a radius of 4 shouldn't seem strange in that it's even. The array size is still odd.
st = strel('disk',4);