MATLAB: How to find the centroid of an object in an image and crop a portion of it around that centre point

image processing

Hi there,

I want to find the centroid for the marked object. After finding the centroid, I need to crop the image around the centroid with a size of 227×227.

Can someone please help by guilding me or writing the code in which I will be able to find the centroid and crop the object from the image? Thank you in advance!

Best Answer

I = imread('image.jpeg') ;
[nx,ny,nt] = size(I) ;
x = 1:ny ; y = 1:nx ;
C = round([mean(x) mean(y)]) ;
idx = C(2)-227:C(2)+227 ;
idy = C(1)-227:C(1)+227 ;
I = I(idx,idy,:) ;
imshow(I)

YOu may play around with idx and idy

Related Solutions

MATLAB: Centroid of an image

Hi,

did you mean 'find centroid of objects in an image'??

use regionprops with property : centroid

Eg : stat = regionprops(Ilabel,'centroid');

I = imread('coins.png');
Ibw = im2bw(I);
Ibw = imfill(Ibw,'holes');
Ilabel = bwlabel(Ibw);
stat = regionprops(Ilabel,'centroid');
imshow(I); hold on;
for x = 1: numel(stat)
    plot(stat(x).Centroid(1),stat(x).Centroid(2),'ro');
end

MATLAB: Want to find the circular regions

Compute the circularities and determine the circularity that is the dividing line between a circle and non-circle

labeledImage = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Area', 'Perimeter');
allAreas = [props.Area];
allPerimeters = [props.Perimeter];
circularities = allPerimeters .^ 2 ./ (4 * pi * allAreas);
acceptableCircs = circularities < 4; % Or whatever works
indexes = find(acceptableCircs);
circBlobsOnly = ismember(labeledImage, indexes);
imshow(circBlobsOnly);

Best Answer

Related Solutions

MATLAB: Centroid of an image

MATLAB: Want to find the circular regions

Related Question