How to detect the edges in the picture using Robert, Sobel and Prewitt's operator?

Hi, I'm pretty new to Matlab and I need help in the task. It is necessary to apply Robert's, Sobel's and Prewitt's edge detectors to a picture, then interruptions in the contour edges fill and connect the contour.

Any help would be greatly appreciated.

Thank you

Answer 1

[Mark Sherstan]

Refer to some of the tutorials found here and here then come back with specific quesitons you might have.

[Miralem Ikanovic]

i = imread('slika64_1.jpg');

I = rgb2gray(i);

BW1= edge(I,'sobel');

subplot (2,2,1);

imshow(I);

title('original');

subplot(2,2,2);

imshow(BW1);

title('Sobel');

How to write part of the dilatation code and impact zone?

[Image Analyst]

What is impact zone? It looks like you already got everything you need.

[Mark Sherstan]

Nice work! You can use imdilate and imfill.

[Miralem Ikanovic]

i=imread('slika64_1.jpg');
subplot(2,2,1);
I=rgb2gray(i);
imshow(I);
title('Orginal');
BW1=edge(I,'prewitt');
subplot(2,2,2);
imshow(BW1);
title('Prewitt');
se90 = strel('line', 6, 90);
se0 = strel('line', 6, 0);
BW2dil = imdilate(BW1, [se90 se0]);
subplot(2,2,3);
imshow(BW2dil); 
title('Dilation');
BW3fill = imfill(BW2dil, 'holes');
subplot(2,2,4);
imshow(BW3fill);
title('Impact zone');

Done !