title: Object Detection: Training Requried or No Training Required?
body: <p>This question is related to Object detection, and basically, detecting any "known" object. For an example, imagine I have the below objects.</p>
  
  <ol>
  <li>Table</li>
  <li>Bottle.</li>
  <li>Camera</li>
  <li>Car</li>
  </ol>
  
  <p>I will take 4 photos from all of these individual object. One from left, another from right, and other 2 from up and down. I originally thought it is possible to recognize these objects with these 4 photos per each, because you have the photos in all 4 angles, no matter how you see the object you can detect it.</p>
  
  <p>But I got confused with someones idea about training the engine with thousands of positive and negative images from each object. I really don't think this is required.</p>
  
  <p>So simply speaking, my question is, in order to identify an object, do I need these thousands of positive and negative objects? Or else simply 4 photos from 4 angles is enough?</p>
  
  <p>I am expecting to use OpenCV for this.</p>
  
  <p><strong>Update</strong></p>
  
  <p>Actually the main thing is something like this.. Imagine that I have 2 laptops. One is Dell and the other one is HP. Both are laptops but you know, they have clearly visible differences including the Logo. Can we do this using <a href="http://docs.opencv.org/doc/tutorials/features2d/feature_description/feature_description.html#feature-description" rel="nofollow">Feature Description</a>? If not, how "hard" the "training" process? How many pics needed?</p>
  
  <p><strong>Update 2</strong>
  I need to detect "specific" objects. Not all the cars, all the bottles etc. For an example, the "Maruti Car Model 123" and "Ferrari Car Model 234" are both cars but different. Imagine I have the pictures of Maruti and Ferrari of above mentioned models, then I need to detect them. I don't have to worry about other cars or vehicles, or even other models of Maruti and Ferrari. But the above mentioned "Maruti Car Model 123" should be identified as "Maruti Car Model 123" and above mentioned "Ferrari Car Model 234"should be identified as "Ferrari Car Model 234". How many pictures do I need for this?</p>