title: Read xml file with type_id opencv-image using opencv
body: <p>Hey i have tried a lot search in reading xml file with type_id "opencv-image", all i am looking here is "opencv-matrix" and all help available is useless for me. 
  Please help me out in reading an image matrix from xml file. </p>
  
  <p>I am pasting here an upper portion of my xml file for some idea.</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;opencv_storage&gt;
  &lt;depthImg190 type_id="opencv-image"&gt;
  &lt;width&gt;320&lt;/width&gt;
  &lt;height&gt;240&lt;/height&gt;
  &lt;origin&gt;top-left&lt;/origin&gt;
  &lt;layout&gt;interleaved&lt;/layout&gt;
  &lt;dt&gt;w&lt;/dt&gt;
  &lt;data&gt;
  0 0 0 0 27120 27384 27120 27120 27384 27120 27120 27120 27120 27384
  27384 27664 27664 27944 27944 27664 27664 27944 27944 27944 28224
  27944 27944 28224 28224 28224 28224 28520 28816 29120 29120 29120
  29120 29120 29120 29120 29432 29744 30072 30072 29744 29744 30072
  30072 30072 30400 30400 30736 30736 31080 31080 31080 31440 31440
  31440 31440 31800 31800 31800 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 27120 27120 27120 27120 27384 27384 27384 27384 27384 27384
  &lt;/depthImg190&gt;
  &lt;/opencv_storage&gt;
  </code></pre>
  
  <p>I have used the code  </p>
  
  <pre><code>FileStorage f;
  Mat m;
  f.open("temp.xml", FileStorage::READ);
  f["depthImg190"] &gt;&gt; m;
  f.release();
  </code></pre>
  
  <p>but i am facing an exception  "Opencv Errorr: Bad argument &lt; Unknown array type > in cv::read, file ........\opencv\modules\core\persistence.cpp, line 5535".</p>
  
  <p>Any help would be appriciated</p>