title: Polling IPhone Camera to Process Image
body: <p>Scenario is I want my app to process (in the background if possible) images been seen by the iphone camera. </p>
  
  <p>e.g. App is running, user places the phone down on a piece of red cardboard, than want to display an alertview saying "Phone placed on Red Surface"(this is a simplified version of what i want to do but just to keep the question direct).</p>
  
  <p>Hope this makes sense. I know there is two seperate concerns here.</p>
  
  <ol>
  <li>How to process images from the camera in the background of the app (if we cant do this that we can initiate the process with say a button click if needed).</li>
  <li>Processing the image to say what solid colour it is sitting on.</li>
  </ol>
  
  <p>Any help/guidance would be greatly appreciated.</p>
  
  <p>Thanks</p>