title: Modify the OpenCV Sticher class for speed
body: <p>As I understood the OpenCV Stitcher class matches every input image with all other images, which allows to push unordered images yet get a correct output panorama. But which of course slows down exponentially the stitching process.</p>
  
  <p>In my case the user will capture images moving the camera from left to right, so the order of the images is known.</p>
  
  <p>How can I modify the Stitcher class to compare only side to side images, so no need to compare one against all when matching?</p>
  
  <p>Thanks</p>