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detecting whether a particular object is present or not

 I need to detect whether an object (leaf) is present or not in the live frame captured from the camera.
 I searched for object detection and i find face detection in openCV documentation using cascade classifier, where some image of the object is given to train the classifier. 

In my case i have to detect whether the current frame contains any leaf(of any plant) or not.
1. whether i have to train the classifier with large set of data to detect the leaf? 
2. is there any alternate way for my task?

detecting whether a particular object is present or not

I need to detect whether an object (leaf) is present or not in the live frame captured from the camera. camera. I searched for object detection and i find face detection in openCV documentation using cascade classifier, where some image of the object is given to train the classifier. In my case i have to detect whether the current frame contains any leaf(of any plant) or not. 1. not.
whether i have to train the classifier with large set of data to detect the leaf? 2.
is there any alternate way for my task?
task?