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how com from the number of neighborhood size of adaptthresh

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mohd akmal masud
mohd akmal masud el 23 de En. de 2023
Comentada: mohd akmal masud el 24 de En. de 2023
Hello all,
I've tried the neighborhood size as default for adaptthresh as in figure attached.
The value 42 I know it come from, But I dont know how come the value 26 from?
anyone can explain to me?
>> bb=2*floor(size(spect)/16)+10
bb =
42 42 26
  4 comentarios
DGM
DGM el 24 de En. de 2023
Editada: DGM el 24 de En. de 2023
That parameter is the size of a rectangular window which has odd geometry and is at least size(I)/16 in radius. Note two things. First, the trailing addend is 1, not 10.
x = [256 256 142];
y = 2*floor(x/16)+1
y = 1×3
33 33 17
Second, if you want the window width to be 2*floor(size(I)/16)+1, you don't need to specify it. That's just how it's calculated internally by default.
As to why it needs to be odd, that's often desirable for one of two reasons. First, an odd window gives you a clear center pixel. Second, since the median is being calculated, it gives you a clear central order statistic.
As to why it's size(I)/16, I don't know off the top of my head. I'd have to look at the references and the code.

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