title: How to detect architecture and sculpture in opencv?
body: <p>can someone tell me how i can detect pictures of architecture or sculpture?
  I think  <code>hough-transforming</code> is a good approach. But i'm new in CV and maybe there a better methods to detect pattern. I heard about haarcascade. can i take this for architecture,too?
  For example i want to detect those kind of pictures:</p>
  
  <p><a href="https://i.stack.imgur.com/HyFnB.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HyFnB.jpg" alt="Image Hosted by ImageShack.us"></a>
  
  <a href="http://img842.imageshack.us/img842/4748/resizeimg0931.jpg" rel="nofollow noreferrer">Image Hosted by ImageShack.us http://img842.imageshack.us/img842/4748/resizeimg0931.jpg</a></p>