title: Check presence of subimage in image in iOS
body: <p>I have 2 images, say smallerImage and largerImage. Now, I want to check that does smallerImage  is part(or subimage) of largerImage or not. I am not getting how to check that. I want to so this whole stuff in iOS. After gogling, i got that using openCV library is best library to use for such a stuff. But i am not getting how to use openCV library to perform my task. </p>
  
  <p>In Short, i want to know about,</p>
  
  <p>1) What are the different techniques/methods/algorithms to find/check subimage in larger image</p>
  
  <p>2) How to use openCV Library to perform (1).(i.e. how to use it to check subimage in larger image)</p>