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From: sanjay on 25 Apr 2010 09:37
Dear all,



I have a binary image which is thinned and then I found centroid for each connected component, Then I specify some radii considering centroid as origin. How to find whether white pixel exist within that radii having centroid as the origin in matlab. I am sending code for thinning and for finding centroid. pls help I am new to matlab.



r = 0.02;

t = bwmorph(bw, 'thin',Inf);

figure,imshow(t);title('thinned image');

[L, n] = bwlabel(t);

hold on

for k = 1:n

[r,c] = find(L == k);

rbar = mean(r);

cbar = mean(c);

plot(cbar,rbar, 'g.');

hold off
From: ImageAnalyst on 25 Apr 2010 10:31
You obviously have the Image Processing Toolbox so you can just use
regionprops after you label the image to get the centroids. See my
demo if you want an example:
http://www.mathworks.com/matlabcentral/fileexchange/25157
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