Edge Detection in a 2D Matrix
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Hi there,
I have a 2D matrix which contains contains 0s and 1s as shown in the left image below. I would like to get the outer boundary of this shape. By using the edge function, it gives a nice estimate of the boundary, but some of the points lie on the original shape. What I did was to use the "edge" function directly with only my 2D matrix as input. Are there any ways to get the outer boundary only and without any points intersecting the original shape? Thank you.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1446707/image.jpeg)
2 commentaires
Dyuman Joshi
le 31 Juil 2023
What is the output you want to obtain?
Also, can you attach your data? Use the paperclip button to do so.
Réponse acceptée
DGM
le 31 Juil 2023
Consider the example:
% a logical image
mask = imread('tinyblobs.png');
imshow(mask)
% generate the perimeter image
paddedmask = padarray(mask,[1 1],'replicate','both');
perim = bwperim(~paddedmask);
perim = perim(2:end-1,2:end-1);
imshow(perim)
% show that the new pixels do not overlap the original blobs
% and that there is no gap between the two
imshow(imfuse(mask,perim))
Plus de réponses (2)
Bruno Luong
le 31 Juil 2023
Modifié(e) : Bruno Luong
le 31 Juil 2023
Do you want this
load(websave('data.mat','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1446792/data.mat'))
d=conv2(data,[0 1 0; 1 1 1; 0 1 0],'same')>0;
b=d-data;
figure
imagesc(data);
axis equal
figure
imagesc(b)
axis equal
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