Multiscale dilation:structure unit does not change after imdilate by itself. What the multiscale dilation meaning?

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song fu
song fu on 27 Nov 2021
Edited: Prachi Kulkarni on 2 Dec 2021
g=[0 1 0;0 1 0;0 1 0];
n=3;
ng=g;
for i=1:n
ng=imdilate(ng,g)
end
  1 Comment
DGM
DGM on 27 Nov 2021
The strel has a width of 1px. Dilation with a 1px strel does no change.
A = zeros(5);
A(3,3) = 1
A = 5×5
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0
imdilate(A,1)
ans = 5×5
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0

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Answers (1)

Prachi Kulkarni
Prachi Kulkarni on 1 Dec 2021
Edited: Prachi Kulkarni on 2 Dec 2021
Hi,
As per the definition of dilation described at the end of the documentation on imdilate, the structural element g when operated on the matrix ng should not lead to any change in the matrix ng.
This is not generally true. It is applicable to your particular definitions of the variables g and ng.
  2 Comments
DGM
DGM on 2 Dec 2021
I'm sorry. I trust you know that. I just wanted to make sure that OP or a future reader didn't misinterpret it that way, and used the opportunity to elaborate on my own prior comments.

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