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Boundary Extraction in MATLAB


Boundary Extraction in MATLAB
Let A be an Image matrix and B be a structuring element.


Formula for Boundary Extraction:



Steps to be followed:
·         Convert the image into binary image.
·         Perform Erosion:
                Erode binary image A by structuring element B. (i.e)
                     
               
·         Subtraction:
              Subtract the binary image A from the Eroded image.(i.e)

             



A=imread('banana.jpg'); 


C=rgb2gray(A);
C(C<225)=0;
s=strel('disk',4,0);%Structuring element
D=~im2bw(C);%binary Image
F=imerode(D,s);%Erode the image by structuring element
figure,imshow(A);title('Original Image');
figure,imshow(D);title('Binary Image');


%Difference between binary image and Eroded image
figure,imshow(D-F);title('Boundary extracted Image');



Example 2:









A=imread('nutsbolts.tif');
s=strel('disk',2,0);
F=imerode(A,s);
figure,
subplot(2,1,1);
imshow(A);title('Binary Image');
subplot(2,1,2);
imshow(A-F);title('Boundary extracted Image');







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