Image segmentation training set labeling

I am new to pytorch and Deep learning. I am trying to do image segmentation. But , I am stuck at how to label training set images.

This is one of my training image

I have two kinds of plants here - one is weed and another one is a good crop. I need to label them.

Can anyone tell me how can I do this ?

• I am going to use deep neural network model ResNet , do I still need to label ? And one more thing : I do not have any labeled training data Apr 7 '18 at 18:26