How to remove edges from objects in Matlab?
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Let's say I have an array of objects `objects` and each object contains `vertices`
So for example, let's say I have 2 `objects`, each containing 4 `vertices`, and I plot the vertices and connect them using a line in Matlab:
size_vertices=size(vertices);
for o=1:length(objects)
for v=1:size_vertices(1)-1
plot([vertices(o, v,1) vertices(o, v+1,1)], [vertices(o,v,2) vertices(o,v+1,2)], '-k' )
end
end
So let's say `
vertices(1,:,:)=[1 5; 1 1; 5 1; 4 6]
`
and `
vertices(2,:,:)=[5 10; 3 8; 1 5; 4 6]
how can I remove the inner edges?
回答（2 个）
Walter Roberson
2019-1-9
0 个投票
Provided that your polygons never have crossed lines and are never disconnected, then you can use boundary(), making sure to set the shrink factor high (e.g., 1). boundary() was added in R2014b.
1 个评论
Walter Roberson
2019-1-9
create a graph object and use conncomp to find the connected components and boundary each group.
Image Analyst
2019-1-9
0 个投票
bwboundaries() only works with a digital image, not something plotted in the graphical overlay using plot(). Do you have a digital image? If not, try using boundary() like Walter initially suggested. If you have a digital image, you can use bwboundaries() or bwperim().
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