title: What is the image interpolation algorithm that used in Office word 2013?
body: <p>I inserted an image into an office word(version 2013) document and drag its corner to enlarge its size,and I found that the enlarged image(the first one) has a very good resolution,even better than the image that I process with bicubic/bilinear interpolation in MATLAB(the second one). So I wonder what the algorithm it is that used in word?</p>
  
  <p>Image1 is the enlarged image in Word 2013:</p>
  
  <p><a href="https://i.stack.imgur.com/pIsZt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pIsZt.png" alt="enter image description here"></a></p>
  
  <p>Image2 is the interpolation in MATLAB:</p>
  
  <p><a href="https://i.stack.imgur.com/VTaS5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VTaS5.png" alt="enter image description here"></a></p>