title: Object Identification using opencv in a given image
body: <p>in my project i want to identify objects and then detect what they are(water bottle, ball, etc).
  I thought of identifying the objects in the image and then match that object with a object database using SURF method. </p>
  
  <p>But the problem is to identify the whether my image has a object or not and how many objects are there.</p>
  
  <p>I did some search and find out about "contours", a way to track shapes. I want to know whether "contours" will help to solve my problem or any other way to solve this.</p>
  
  <p>Thanks.</p>