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Edge Detection in a 2D Matrix

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Wayne
Wayne 2023-7-31
评论： Wayne 2023-8-8
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.
  2 个评论
Dyuman Joshi
Dyuman Joshi 2023-7-31
What is the output you want to obtain?
Also, can you attach your data? Use the paperclip button to do so.
Wayne
Wayne 2023-7-31
Hi @Dyuman Joshi thanks for the reply - i have attached the data. I would like to have a boundary of a single pixel which surrounds the original figure. The "edge" function does that to some extent, but there are still some overlapped regions.

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采纳的回答

DGM
DGM 2023-7-31
Ran in:
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))

更多回答（2 个）

Matt J
Matt J 2023-8-1
编辑：Matt J 2023-8-1
Ran in:
% a logical image
mask = imread('tinyblobs.png');
outerboundary = imdilate(mask,strel('disk',1))&~mask;
imshow(mask+2*outerboundary,[])
Bruno Luong
Bruno Luong 2023-7-31
编辑：Bruno Luong 2023-7-31
Ran in:
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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