title: sift features for "similar" objects
body: <p>I find out that <a href="http://en.wikipedia.org/wiki/Scale-invariant_feature_transform" rel="nofollow">SIFT </a> features is only good for find the same object in the scene, but it seems not suitable for "similar" objects.</p>
  
  <p>maybe I doing something wrong?
  maybe I must use some other descriptors? </p>
  
  <p>images and SIFT\ASIFT algorithms work:</p>
  
  <p><a href="http://www.ipol.im/pub/demo/my_affine_sift/archive?key=0E6EAE29E2C5D31A2898F869A8DAF83A" rel="nofollow">link </a></p>
  
  <p>same problem- no matches</p>
  
  <p><a href="http://www.ipol.im/pub/demo/my_affine_sift/archive/?key=B0DC021AA9AEED012DDD02F3DCC8BB6B" rel="nofollow">link </a></p>