i was writing a code for mathematical morphology dilation operation for a 1D signal but did not get proper output. Kindly help me with the proper code

the code i wrote:

 function y_dil=dilation(x,se)

 L=length(se)
 x=[zeros(1,L) x];
 N=length(x)
 k=1+L;
 y_dil=zeros(1,N);

 for n=k:N
 for i=1:L   
 r(i)=max(x(n-i)+se(i))
 end
 Y_dil(k-L)=max(r);
 k=k+1;
 end

 end

Answer 1

[Massimo Zanetti]

Use imdilate function which is already in Matlab. https://it.mathworks.com/help/images/ref/imdilate.html

For example, if your signal is SIGNAL matrix (1xN matrix), and your structuring element is SE=[1,1,1], try this:

DIL_SIGNAL = imdilate(SIGNAL,SE)

[pavan sunder]

i tried but didnt work. it will not support 1D signal i think it works only for 2D images. please guide me with proper syntax, is there any additional input criterion i need to mention within the braces?

[Massimo Zanetti]

Mmm, it should work. See my outputs:

S=[1,1,1,0,0,0,0,1,1,1,0,0];
DIL = imdilate(S,[1,1,1]);
%then I get (as expected)
%DIL=[1,1,1,1,0,0,1,1,1,1,1,0]

Try this on your machine and tell if works.

[Walter Roberson]

A 1D signal is a very thin 2D signal ;-)

[Massimo Zanetti]

Hahahaha, true.

Answer 2

[M E]

Supporting the solution provided by Massimo, You can make costum length structuring elements:

DIL = imdilate(S,strel('line',Len,0))