Draw Rectangles Around Binary Image Objects: Region Props

Question

Hi, from the binary image above, I've tried drawing boundaries around the object and successfully counted them. But I'm thinking of trying another method which is to use the regionprops to extract information of the location of the blobs. But I do not know how to draw a rectangle around them. info = regionprops(img2,'Boundingbox') By using this command, the command windows shows 4×1 struct array with fields: BoundingBox Which from what I guess is the total of bounding boxes it found from the image similar to the boundary way that I used. Can I use this information and draw a rectangle for the images and and display it in my source image?

Expert Answer

Neeta Dsouza PhD Expert

Answered Aug 28, 2026

info = regionprops(img2,'Boundingbox') ;

imshow(img2)
hold on
for k = 1 : length(info)
     BB = info(k).BoundingBox;
     rectangle('Position', [BB(1),BB(2),BB(3),BB(4)],'EdgeColor','r','LineWidth',2) ;
end

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