Edge Detection in a 2D Matrix
显示 更早的评论
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
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
2023-7-31
采纳的回答
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）
% a logical image
mask = imread('tinyblobs.png');
outerboundary = imdilate(mask,strel('disk',1))&~mask;
imshow(mask+2*outerboundary,[])
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
类别
在 帮助中心 和 File Exchange 中查找有关 Images 的更多信息
Translated by 
