code for performing erosion and dilation without using builtin functions like imdilate or imerode??

code for dilation and erosion without using builtin functions?

[John D'Errico]

So write one. It is your homework after all. Why not make an effort. If and when you have a real question, then ask it.

[Walter Roberson]

"aaa aaa" commented

then why u r having tis page ..better close it

[Walter Roberson]

"aaa aaa": this facility exists to educate, not to do people's work for them.

When someone has a homework question, then at the very least we expect them to explain what it is they do not understand, at which point we will explain, or we will point them to appropriate documentation.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[aslan memo]

if use this Structuring =[0 1 0;1 1 1;0 1 0]; how to write code ??

[Walter Roberson]

How to write the code to accomplish what purpose?

Answer 2

[SIMI M S]

Dilation code

A=imread( 'text.png' );
A=im2bw(A);
%Structuring element
B=[1 1 1 1 1 1 1;];
C=padarray(A,[0 3]);
D=false(size(A));
for i=1:size(C,1)
    for j=1:size(C,2)-6
        D(i,j)=sum(B&C(i,j:j+6));
    end
end
figure,imshow(D);

[Faiza Bukenya]

Erosion code

A=imread('faiza.png')
A=im2bw(A);
%Structuring element
B=[1 1 0];
%Pad array with ones on both sides
C=padarray(A,[0 1],1);
%Intialize the matrix D of size A with zeros
D=false(size(A));
for i=1:size(C,1)
    for j=1:size(C,2)-2

        L=C(i,j:j+2);

 %Find the position of ones in the structuring element

        K=find(B==1);

       if(L(K)==1)

        D(i,j)=1;

        end

    end
end
figure,imshow(D);

[Borhan Raad]

does it work with 3x3 Structuring element? if not, what adjustment do we need to make?

[Walter Roberson]

That code is only designed for linear structuring elements. The adjustment to it for a different width of linear structuring element would be

    for j=1:size(C,2)-size(B,2)+1
        L=C(i,j:j+size(B,2)-1);

Answer 3

[Mohammed Hassan]

code for dilation and erosion without using builtin functions ?

[Image Analyst]

movmax() is dilation. movmin() is erosion.