How do I create a MINIMUM bounding box on an object/ s in this image

I write this coe and I got this:

labelImg = bwlabel(BW); % BW-binary image
objectsDetail = regionprops(labelImg,'all');
numberOfObjects = size(objectsDetail, 1);
ii=1;
for k=1:numberOfObjects
    boundary = B{k};
    
    thisBlobsBoundingBox = objectsDetail(k).BoundingBox;
    subImage = imcrop(BW, thisBlobsBoundingBox);
    imshow(subImage)
end

I would like to get something like this, but I have no idea :(