title: Double thresholding is automatic, semi-automatic or manual segmentation?
body: <p>I have used two threshold values for segmenting an image, Is it automatic, semi-automatic or manual segmentation.</p>
  
  <pre><code>I = imread('tumor1.jpg');
  I(I&lt;=140) = 0;
  I(I&gt;=225) = 0;
  BW = im2bw(I,graythresh(I));
  imshow(BW)
  </code></pre>