MATLAB: Detect all the rectangles in image

rectangle detectionshape detection

Hey all,

in the following image, all the rectangles are a little bit deformed due to power leakage effect. I want to detect all the rectangles and obtain the positions of the rectangles.

Is there a way to detect all rectangles?

Thank you

Best Answer

It's trivial. Just use regionprops(). See my Image Segmentation Tutorial

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MATLAB: Number of Object in binary image

Try this:

bw = imread('bw.png');
if ndims(bw) > 1
	bw = bw(:,:,1);
end
% Threshold
bw = bw > 128;
subplot(1, 2, 1);
imshow(bw, []);
% Fill holes
bw = imfill(bw, 'holes');
% Get areas
props = regionprops(bw, 'Area');
sortedAreas = sort([props.Area], 'descend')
% Looks like we need to throw away any blobs less than 1000 pixels or so
bw = bwareaopen(bw, 1000);
subplot(1, 2, 2);
imshow(bw);
% Count the blobs
[labeledImage, numBlobs] = bwlabel(bw);
fprintf('Found %d shapes.\n', numBlobs);

MATLAB: How to compute centroidal distances

I assume you mean regionprops(BW, I ,'WeightedCentroid') ? You need an intensity image I, to invoke that option.

Best Answer

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MATLAB: Number of Object in binary image

MATLAB: How to compute centroidal distances

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