title: Find angle form set of images
body: <p>I have set of 2000 plane images similar to image below. Plane has different angle on every image. Image size is 512x512 and in every image is always this same plane.</p>
  
  <p><img src="https://vignette3.wikia.nocookie.net/battlefield/images/8/86/National_Plane.png/revision/latest?cb=20100531015956" alt="enter image description here"></p>
  
  <p>My goal is to find angle on image which is not in test set.</p>
  
  <p>So far I tried:</p>
  
  <ul>
  <li><strong>Harris corner detection</strong>, but in every image Harris gives me differnt
  amount of points, event for images with very similar position.</li>
  <li><strong>Hough Lines Transform</strong> to find the longest line and get inclination to the axis X.</li>
  <li><strong>Corelation</strong> - this method gives the best results, but it take really long time and angels are only rough.</li>
  <li><strong>Neural network</strong> 
  
  <ul>
  <li>Back porpagation to train image from Harris points and hough lines transform, but without any success. </li>
  </ul></li>
  </ul>
  
  <p>I so 3D object in STP file, but I have no idea how to use it, to solve my problem.
  It would be nice to get any sugestion of method, article or example.</p>