Extract and sort size of matrix where in the cell

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Amir Azadeh Ranjbar
回答： Arjun 2025-1-8
clc;clear;close all
im= [0 0 0 0 0 0 0 0 0 0
0 0 1 1 1 1 1 1 0 0
0 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 1 1 1 1 1
0 0 0 0 0 0 0 0 0 0];
cc=bwconncomp(im);
for i=1:cc.NumObjects
CC{i}=cc.PixelIdxList{i}
end
Size=zeros(1,cc.NumObjects);
for j=1:cc.NumObjects
Size(:,i)=size(cell2mat(CC(j)))
end

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回答（1 个）

Arjun
Arjun 2025-1-8
Hi @Amir Azadeh Ranjbar,
I understand that you want to extract the connected componets in the descending order and also find out the components which are greater than a specific threshold size.
You can refer to the following workflow to achieve this:
  • Find out the connected components using "bwconncomp"
cc=bwconncomp(im);
  • Get the properties of the connected components using "regionprops"
stats = regionprops(cc, 'Area');
  • Extract the sizes of the components
sizes = [stats.Area];
  • Sort the components by descending order using "sort"
[sortedSizes, sortedIndices] = sort(sizes, 'descend');
  • Specify the threshold and filter accordingly
filteredComponents = sortedIndices(sortedSizes > sizeThreshold);
Following are the documentation links of the functions used for your reference:
I hope this will help!

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