title: findContours error 'support only 8uC1 images'
body: <p>Trying to run findContours on a binary image"</p>
  
  <pre><code>Mat conv(image.size(), CV_8U);
  image.convertTo(conv, CV_8U);
  vector&lt;vector&lt;cv::Point&gt; &gt; contours;
  
  findContours(conv, contours, CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);
  </code></pre>
  
  <p>thorws error:</p>
  
  <pre><code>OpenCV Error: Unsupported format or combination of formats ([Start]FindContours support only 8uC1 images) in cvStartFindContours, 
  </code></pre>
  
  <p>Any ideas?
  Thanks</p>