How to draw bounding boxes around the ROI obtained by thresholding.

I want to highlight the region of interest using rectangular bounding box on the original image.

Can anyone here help me with this?

Answer 1

[Image Analyst]

props = regionprops(binaryImage, 'BoundingBox');
for k = 1 : length(props)
    thisBB = props(k).BoundingBox;
    hold on;
    rectangle('Position', thisBB);
end

[Sidra Aleem]

@Image Analyst I tried the same code from the link ( https://de.mathworks.com/matlabcentral/answers/87597-rectangle-around-the-object-bounding-box ). but its gives bounding boxes in the thresholded image.

However, I donot want this. I want these bouding boxes at the same position, but on the segmented image as shown in figure1 in my questionj. I want the bounding box around the thresholded image to be in the same position, but on Blood vessel subplot.

I tried to do the following, but its not working.

st = regionprops(Thresholded_image,'BoundingBox'); % Thresholded image in subplot 2
figure,imshow(bloodVessels);                      %Blood Vessel Image in subplot 3
for k = 1 : length(st)
  thisBB = st(k).BoundingBox;
  rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
  'EdgeColor','r','LineWidth',2 )
end

As shown the third subplot doesnot have any bounding box.

[Image Analyst]

You have to switch the current axes to the one you want to put the boxes onto. For example call subplot() or axes() before you call rectangle().