How do I get only the centroid inside the bounding box?

Question

Suhas Yelluru 2014-7-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/141063-how-do-i-get-only-the-centroid-inside-the-bounding-box

回答： Image Analyst 2022-8-22

%compute area centroid and boundingbox
  stats = regionprops(bw6, ['basic']);
  s = regionprops(bw6, 'centroid');
  centroids = cat(1, s.Centroid);
  imshow(bw6);
  %find size of stats
  [N,M] = size(stats);
  if (bw==0)
      break;
  else
      tmp = stats(1);
  for i = 2 : N
      if stats(i).Area > tmp.Area
          tmp = stats(i);
      end
  end
  bb = tmp.BoundingBox;
  bc = tmp.Centroid;
  imshow(data)
  hold on
  rectangle('Position', bb, 'EdgeColor', 'r', 'LineWidth', 2)
  _*plot(centroids(:,1), centroids(:,2), 'b*');*_
  hold off

The above code shows all the centroids, however, i want only the centroid that is inside the bounding box. How do i extract the coordinates of only that particular centroid?

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Answer 1

Michael scheinfeild 2014-7-9

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inpolygon

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Answer 2

Image Analyst 2022-8-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/141063-how-do-i-get-only-the-centroid-inside-the-bounding-box#answer_1030855

The centroid of a blob will ALWAYS be inside the bounding box of the blob. How could it not be? Can you think of an example where it's not? No, you can't.

It might not be inside the blob's white pixels, like for the case of a blob shaped like the letter G, or a blob that is a donut shape, but it will always be guaranteed to be inside the bounding box of the blob.