title: cv::Mat detect PixelFormat
body: <p>I'm trying to use pictureBox->Image (Windows Forms) to display a cv::Mat image (openCV). I want to do that without saving the Image as a file ('cause i want to reset the image every 100ms). 
  I just found that topic here: <a href="https://stackoverflow.com/questions/9580397/how-to-display-a-cvmat-in-a-windows-form-application">How to display a cv::Mat in a Windows Form application?</a></p>
  
  <p>When i use this solution the image appears to be white only. I guess i took the wrong PixelFormat.
  So how do figure out the PixelFormat i need? Haven't seen any Method in cv::Mat to get info about that. Or does this depend on the image Source i use to create this cv::Mat?
  Thanks so far :)</p>
  
  <p>Here i took a screen. Its not completely white. So i guess there is some color info. But maybe i'm wrong.
  <a href="http://s7.directupload.net/images/120601/rhl87jf6.png" rel="nofollow noreferrer">Screen</a></p>