How can I create structuring element arbitrarily in marker control watershed?

% here a sample code and I wolud like to set structuring element arbitrarily
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se = strel('disk',10);
Io = imopen(I, se);   
Ie = imerode(I, se);  
Iobr = imreconstruct(Ie, I); 
Ioc = imclose(Io, se); 
Iobrd = imdilate(Iobr, se);
Iobrcbr = imreconstruct(imcomplement(Iobrd), imcomplement(Iobr));
Iobrcbr = imcomplement(Iobrcbr);
fgm = imregionalmax(Iobrcbr);
I2 = I;  
I2(fgm) = 255;
%clean the edges of the marker blobs
se2 = strel(ones(5,5));
fgm2 = imclose(fgm, se2);
fgm3 = imerode(fgm2, se2);
fgm4 = bwareaopen(fgm3,10);  %shink them a bit e.g 20
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%please help me ,how can i set arbitrarily

[Walter Roberson]

What is the difference between this question and your previous http://www.mathworks.co.uk/matlabcentral/answers/111276-how-many-ways-to-define-shape-and-size-of-structuring-element-depend-on-images-in-watershed-segmenta ?

In that previous one I already pointed out that strel() can take arbitrary neighbourhoods for the shape. Look at the documentation: it is the second sample syntax http://www.mathworks.com/help/images/ref/strel.html

[kyawt kyawt]

Thank a lot, for your answers. Yes, you already pointed out that strel() can take arbitrary neighbourhoods for the shape. However I don't know that how to obtain for the value of (NHOOD) parameter. NHOOD=[100;100;101] is default for all type of images?

Answer 1

[Walter Roberson]

The example does not show [100;100;101] and instead shows [1 0 0; 1 0 0; 1 0 1] . The example is arbitrary and might not be useful in any real situation (but might be.)

If you want to understand what a particular structuring element will do for you, you need to study morphology; see http://en.wikipedia.org/wiki/Dilation_%28morphology%29

I am not able to explain this at the moment as it is too late at night for me to be able to understand the formulas on first reading.

[kyawt kyawt]

ok thankyou