Bounding box using MATLAB for the image

Question

I am trying to draw a bounding box around the white blob in the image below:

Answer 1

As the 20,000th viewer of this question, I'll answer what I think the asker is actually asking.

To render a rectangle on the page, you just need to properly interpret the bounding box for the shape. You've already computed this in s(idx).BoundingBox

Thus, add these two lines to your script:

bb = s(idx).BoundingBox;
rectangle('Position',[bb(1) bb(2) bb(3) bb(4)],'EdgeColor','green');

and you'll get: