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Find center of pixels in an image?
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Alberto Paniate
il 7 Nov 2020
Risposto: Image Analyst
il 12 Nov 2020
Hi, I have a picture like "Cattura"
I want to find the center of those little areas that we can see.
How can I do?
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Image Analyst
il 12 Nov 2020
Try this:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 18;
fprintf('Beginning to run %s.m ...\n', mfilename);
echo off;
s = load('FileDaAllegare.mat')
grayImage = s.E;
subplot(2, 2, 1);
imshow(imadjust(grayImage), []);
title('Contrast-stretched gray scale image', 'FontSize', fontSize);
subplot(2, 2, 2);
imhist(grayImage);
grid on;
title('Histogram of gray scale image', 'FontSize', fontSize);
% Binarize the image.
mask = grayImage > 0.5;
% Count the initial number of blobs.
[~, numBlobs] = bwlabel(mask);
fprintf('Found %d blobs initially.\n', numBlobs);
% Merge close blobs together with a morphologcal closing.
windowRadius = 7;
se = strel('disk', windowRadius, 0);
mask = imclose(mask, se);
subplot(2, 2, 3);
imshow(mask, []);
title('Binary image', 'FontSize', fontSize);
props = regionprops(mask, 'Area', 'Centroid');
numBlobs = length(props);
% Get all the areas.
allAreas = [props.Area];
% Get all the centroids. Column 1 is x, column 2 is y.
centroidsXY = vertcat(props.Centroid);
fprintf('Found %d blobs after filtering.\n', numBlobs);
% Show histogram of areas.
subplot(2, 2, 4);
histogram(allAreas);
grid on;
caption = sprintf('Histogram of %d Blob Areas', numBlobs);
title(caption, 'FontSize', fontSize);
g = gcf;
g.WindowState = 'maximized';
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/411138/image.png)
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Image Analyst
il 7 Nov 2020
Modificato: Image Analyst
il 7 Nov 2020
I go over this in my Image Segmentation Tutorial
Attach your original gray scale image (not a pseudocolored screenshot) if you need more help.
7 Commenti
Image Analyst
il 10 Nov 2020
Can you make easy on us and please attach it here with the paper clip icon? We'd like the solution to be completely self contained here within the Answers forum, not spread across different web sites. I'll check back later.
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