title: Xcode Unknown type name 'IplImage'?
body: <p>I have the following code:</p>
  
  <pre><code>IplImage *im_rgb = [self CreateIplImageFromUIImage:input_image];
  IplImage *im_gray = cvCreateImage(cvGetSize(im_rgb),IPL_DEPTH_8U,1);
  </code></pre>
  
  <p>I encountered this error: <code>Unknown type name 'IplImage'</code>.</p>
  
  <p>I am using the project provided by this link <a href="https://github.com/agnivsen/Exemplar" rel="nofollow">https://github.com/agnivsen/Exemplar</a>
  But I have imported my own opencv library. I am not sure if it triggered the problem.</p>
  
  <p>Any ideas on how to solve this?</p>