How detect spot white circle on image
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Duc Hang
el 6 de Jun. de 2017
Comentada: Rena Berman
el 23 de Jun. de 2017
I would like detect spot white are like below image . Hope anyone help . Thanks!
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Respuesta aceptada
KSSV
el 6 de Jun. de 2017
Editada: KSSV
el 6 de Jun. de 2017
I = imread('Screen Shot 2017-06-06 at 3.54.58 PM.png') ;
im = imclearborder(im2bw(I));
im_fill = imfill(im, 'holes');
s = regionprops(im_fill, 'Area', 'PixelList');
[~,ind] = max([s.Area]);
pix = sub2ind(size(im), s(ind).PixelList(:,2), s(ind).PixelList(:,1));
out = zeros(size(im));
out(pix) = im(pix);
% imshow(out);
[y,x] = find(out) ;
idx = boundary(x,y) ;
% idx = convhull(x,y) ;
imshow(I)
hold on
plot(x(idx),y(idx),'r','linewidth',3)
Code taken from: https://in.mathworks.com/matlabcentral/answers/343337-how-to-remove-small-portion-in-an-image
If boundary doesn't work, use convexhull
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Image Analyst
el 6 de Jun. de 2017
KSSV's code finds the largest blob that is not touching the border, whereas you actually want roundish objects.
Like I said in your duplicate post, You could use my code for circularity. Or you could also look for Solidities close to 1, or get the BoundingBox and look for aspect ratios close to 1.
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