title: How to find those 64 SURF descriptors to feed them to a Neural Network in matlab
body: <p>Im trying to find out SURF descriptors from a foreground mask, well i got them but im a novice at this, what i want are those 64 or 128 SURF descriptors which I will give as input to a Neural Network, what i cant find is where are those 64 descriptors??</p>
  
  <p>the code is as follows: </p>
  
  <pre><code>I = imread('Sample.jpg');
  
  points = detectHarrisFeatures(I);  % for corners
  Temp = SURFPoints(points.Location); % converts coners to SURF points
  
  [features, validPtsObj] = extractFeatures(I, Temp,'SURFSize',64);
  </code></pre>
  
  <p>when i chceck in command prompt i get lengths as</p>
  
  <pre><code>length(points) = 187
  length(features) = 187
  length(validPtsObj) = 187
  </code></pre>
  
  <p>where are those 64 or 128 descriptors ???</p>