title: How to match keypoints in SIFT ?
body: <p>How to match keypoints in SIFT ? </p>
  
  <p>I have calculated 128 size vector for each keypoint in an image.</p>
  
  <p>let, I1 is original image, I2 is 45 degree rotated image.</p>
  
  <p>I got 130 keypoints for I1 and 104 keypoints for I2.</p>
  
  <p>i.e. 128x130 and 128x104.</p>
  
  <p>I calculated euclidean distance between one keypoint of I1 and all keypoints of I2. so I got again euclidean distance matrix of size 128x104. </p>
  
  <p>Now I need to choose nearest keypoint from this euclidean distance matrix. How I can select minimum distance 128 size vector out of 128 x 104 sized matrix?</p>