title: How is it possible to use Android Camera APIs in non-Camera applications?
body: <p>I would like to use some Android 4 APIs in a non-Camera application.</p>
  
  <p>The API includes some very nice Face Detection classes, including the <code>Camera.Face</code> class available since API 14.  I would like to apply the same Face Detection classes in order to implement face detection on images saved on the device.  I would prefer to use this to process pictures stored on the device itself (ex: social tagging, face image manipulation, etc.) </p>
  
  <p>I require guidance on how to accomplish this re-use task.</p>