how to find the dimension of the biggest component?

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Sultan 2017-7-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/349221-how-to-find-the-dimension-of-the-biggest-component

评论： Image Analyst 2017-7-18

hi all,

I need to find the dimension of the biggest components.Then plotted against p=linspace(0,1,10).

N=10
for i=1:N
  for j=1:N
    if rand(1,1)<0.55
      A(i,j)=1;
    else
      A(i,j)=0;
    end
  end
end
CC = bwconncomp(A,4);
numPixels = cellfun(@numel,CC.PixelIdxList);
[biggest,idx] = max(numPixels);
A(CC.PixelIdxList{idx}) = 2
colours=[1 1 1;0 0 0;1 0 0]
colormap (colours)
imagesc(A)

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Jan 2017-7-18

Please explain uniquely what "the biggest components" are. What problems do you have with the posted code?

Sultan 2017-7-18

biggest component is the component who has biggest number of pixels. The problem is that i want to find the dimension of it

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Answer 1

Image Analyst 2017-7-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/349221-how-to-find-the-dimension-of-the-biggest-component#answer_274587

farthest_points.m

You can use regionprops() to find the axis of an ellipse fitted to the data. They don't give you the Feret (caliper) diameter, so you can adapt my attached code to give you that.

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Sultan 2017-7-18

can you provide more help, still not clear

Image Analyst 2017-7-18

Sure. Attach your image and segmentation algoritm to produce your binary image. Then you can use my Image Segmentation Tutorial http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc to find out how to find all the areas of your blobs. Next, tell me which blob(s) you want the maximum extent (width) computed for. All of them? Just for the one with the greatest area?

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