How can I find the centroids of closely seperated object?

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Bipul Biswas 2021-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/1439169-how-can-i-find-the-centroids-of-closely-seperated-object

评论： Bipul Biswas 2021-8-23

Centriods.png

In the left pannel, I have four obejct, they are close but separated. I am using the " regionprops( image ,'Area','BoundingBox', 'Centroid') but in return I am getting only one centriods. I need each object's centroids. Can you please help me with it?

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DGM 2021-8-23

Please attach a copy of the actual image you're using.

Bipul Biswas 2021-8-23

编辑：Bipul Biswas 2021-8-23

Thanks for the message.

This is the original image.

Left pannel is the dark part of the partilces and right pannel is the bright part of the partilces (Top Figure). I need the centroids of both dark and black parts of each particles.

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Answer 1

DGM 2021-8-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1439169-how-can-i-find-the-centroids-of-closely-seperated-object#answer_773069

编辑：DGM 2021-8-23

在 MATLAB Online 中打开

4dot.png

I'm going to go out on a limb here and guess that the image you're feeding to regionprops() is a numeric image instead of a logical image. If that's the case, it will assume that it's a label array (as from bwlabel()). From that assumption, it interprets all blobs as having the same label (label 1), treating them all as one object.

inpict = imread('4dot.png');
% if the image is numeric
inpict = im2double(inpict);
S = regionprops(inpict,'centroid');
C = vertcat(S.Centroid)
C = 1×2
  204.0885  135.5302
% if the image is logical
inpict = inpict>0.5;
S = regionprops(inpict,'centroid');
C = vertcat(S.Centroid)
C = 4×2
  166.3950  106.1014
  184.9957  160.6012
  232.1303   97.4901
  262.4825  160.1700

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DGM 2021-8-23

Given that OP is dividing the objects into two regions, I was under the impression that the half-object centroids was more important than the centroid of each round object.

Bipul Biswas 2021-8-23