# IMAGE PROCESSING

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And that has made all the difference "-Robert Frost

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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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