How to get x,y coordinates of each pixels in a connected component ??

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nayomi ranamuka
nayomi ranamuka 2011-7-8
评论： Walter Roberson 2021-4-6
Dear all,
I = imread('image.jpg');
I2 = im2bw(I) ;
st = regionprops( I2, 'PixelIdxList', 'PixelList');
We can get pixelId list and pixels of connected components as above. But I need to get the x,y coordinates of each pixels. Anybody can help me?
Thank you..

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回答（4 个）

Andrei Bobrov
Andrei Bobrov 2011-7-8
st = regionprops( I2, 'PixelList');
xy=cat(1,st.PixelList)
xy(:,2) = abs(xy(:,2) - size(I2,1)) + 1
plot(xy(:,1),xy(:,2),'g*')
Sean de Wolski
Sean de Wolski 2011-7-8
[y x] = find(I2)
Paulo Silva
Paulo Silva 2011-7-8
bw = imread('text.png');
L = bwlabel(bw);
s = regionprops(L, 'centroid');
XY=[s.Centroid];
ax=axes
hold on
imshow('text.png','Parent',ax)
plot(ax,XY(1:2:end),XY(2:2:end),'*')
  1 个评论
nayomi ranamuka
nayomi ranamuka 2011-7-8
This is useful to get coordinates from user interface.But I need to get coordinates from pixel Ids. But I don't know that it's possible or not.
Thank you

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Sergio Arango
Sergio Arango 2021-4-6
[x,y]=size(I2);
[~,y2]=size(st.PixelIdxList);
for i=1:y2
locs(i,1)=rem(st.PixelIdxList{1,i}(1),x);
locs(i,2)=fix(st.PixelIdxList{1,i}(1)/y)+1;
end
This code gives you the locations of the first pixel in each region. I don't know if this one's helpful, but I hope so :)

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