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

Question

nayomi ranamuka 2011-7-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11143-how-to-get-x-y-coordinates-of-each-pixels-in-a-connected-component

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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Answer 1

Andrei Bobrov 2011-7-8

3
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11143-how-to-get-x-y-coordinates-of-each-pixels-in-a-connected-component#answer_15229

在 MATLAB Online 中打开

st = regionprops( I2,  'PixelList');
xy=cat(1,st.PixelList)
xy(:,2) = abs(xy(:,2) - size(I2,1)) + 1
plot(xy(:,1),xy(:,2),'g*')

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Answer 2

Sean de Wolski 2011-7-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11143-how-to-get-x-y-coordinates-of-each-pixels-in-a-connected-component#answer_15241

在 MATLAB Online 中打开

[y x] = find(I2)

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Answer 3

Paulo Silva 2011-7-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11143-how-to-get-x-y-coordinates-of-each-pixels-in-a-connected-component#answer_15218

在 MATLAB Online 中打开

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),'*')

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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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Answer 4

Sergio Arango 2021-4-6

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11143-how-to-get-x-y-coordinates-of-each-pixels-in-a-connected-component#answer_667767

在 MATLAB Online 中打开

[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 :)