title: CIImage, CIDetector - how to find other objects in images other than faces
body: <p>Is there anyway to find other objects in images without having to integrate other 3rd party libraries like openCV and write all the algorithms myself..</p>
  
  <p>i.e. if i wanted to locate anything an in image that looks like a door? or locate anything that looks like a number 1...9?  </p>
  
  <p>Is there support to pass in a 2D shape image, and a photo, and have IOS try to find that shape in the photo file? </p>