how can i extract radius signature of a binary image?

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mohsen gold
mohsen gold 2013-8-26
编辑： Sabanam 2014-2-25
i have a binary image and radius signature is distance between pixels on contour of object and its centroid. i use bwboundaries() but result is not good
i saw a example in matlab code of bwboundaries(),it used plot to show contour plot has best result but i dont need plot i need a matrix. i use blow code but my result is not same with matlab's example.
img4=zeros(size(img3));
[B,L] = bwboundaries(img3,'noholes');
for k = 1:length(B)
boundary = B{k};
for i=1:size(boundary,1)
img4(boundary(i,1), boundary(i,2))=1;
end
end

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回答（3 个）

Image Analyst
Image Analyst 2013-8-26
编辑：Image Analyst 2013-8-26
Use regionprops to find the centroid, then use the Pythagorean theorem to get the distances between the boundary x,y coordinates and the centroid.
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Sabanam
Sabanam 2014-2-25
Thanks sir...its really helpful and the best answer to find radius signature...
Sabanam
Sabanam 2014-2-25
编辑：Sabanam 2014-2-25
Which formula used to find centroid in matlab?..Whenever i have read they are using mean of the point but is it right?

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