title: SURF Descriptor and Matching for Multiple Image in Matlab
body: <p>I'm working on Content based image retrieval project using matlab 
  when I apply the function <code>point=detectSURFFeatures(image)</code>
  I get <code>83*1</code> surf point that has the following information:</p>
  
  <pre><code>         `Scale: [83x1 single]
            SignOfLaplacian: [83x1 int8]
            Orientation: [83x1 single]
            Location: [83x2 single]
            Metric: [83x1 single]
            Count: 83`
  </code></pre>
  
  <p>I need to know how I can extract a (distinctive and Fixed) feature vector    that represents each image in a database that contains thousands of images,any help please ?<br>
  Here is the <a href="https://projects.cs.dal.ca/ipami/projects/CBIR/demo/?image=472.jpg&amp;database=Wang" rel="nofollow">samples of the database</a>. (Wang database)</p>