how to draw lines of shortest distances on this image identifying a particular shape ?

Question

Shan Kapoor 2012-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/25650-how-to-draw-lines-of-shortest-distances-on-this-image-identifying-a-particular-shape

Hi All,

I have an image on which i marked some points running "imregionalmax" function. like below

https://plus.google.com/photos/116243239493929305987/albums/5654551980894583617/5695615569581847202?banner=pwa

Now I want to join points on each black laths like this

https://plus.google.com/photos/116243239493929305987/albums/5654551980894583617/5695616729342773106?banner=pwa

I tried to write a code like below,

for p = 1:(length(trI)-1) y = [trI(p),trI(p+1)]; x= [trJ(p),trJ(p+1)]; linexy=line(x,y); plotline=plot (x,y);

end and I get an output like this.. https://plus.google.com/photos/116243239493929305987/albums/5654551980894583617/5695617771576908114?banner=pwa

how will I eliminate this situation of likes connecting between laths... it should be the shortest line in a single grain as shown in the expected results...

thanks in advance, Shanoob

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Answer 1

Michael 2012-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/25650-how-to-draw-lines-of-shortest-distances-on-this-image-identifying-a-particular-shape#answer_33663

An idea might be to rank pairs of points based on their proximity, then define some sort of cut-off below which the pair gets a line between them. Of course this method may lead to overlapping lines and you might need a second routine which disregards a pairing between two points who also have (shorter) pairings to a common 3rd point.

Just some ideas, not sure of the best way