Border detection out of regular shape

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Albert
Albert 2022-4-8
评论： Albert 2022-4-11
Hi, I have this shape in the plot, but I want to detect the 4 tails sticking out of the square in order to remove them. How could I detect them? I only have a single vector of points (x,y) which are in the plot. Attached is the variable containing the points.
Thanks!
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Les Beckham
Les Beckham 2022-4-8
If you attach your data as a mat file using the paperclip (either edit your question or add it in a comment), it will make it easier to help you.

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Matt J
Matt J 2022-4-8
编辑：Matt J 2022-4-8
Ran in:
load data_points
data0=data;
shp=alphaShape(data,0.9);
[~,V]=boundaryFacets(shp);
shp=polyshape(V,'Simplify',true);
Warning: Polyshape has duplicate vertices, intersections, or other inconsistencies that may produce inaccurate or unexpected results. Input data has been modified to create a well-defined polyshape.
for i=[-1,sqrt(2)]
shp=polybuffer(shp,i,'Joint','square');
end
tf=shp.isinterior(data);
data=data(tf,:);
plot(data0(:,1),data0(:,2),'o',data(:,1),data(:,2),'.r'); hold on
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Matt J
Matt J 2022-4-8
Yes, or you could use isinterior() as in my now modified solution.

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