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Opencv sum()[]

I am new to opencv , I do not understand the function "sum".

Mat img=(Mat_<double>(3,3)<<0,-1,0,-1,5,-1,2,-1,0); double rr=sum(img)[0]; cout<<"rr"<<rr&lt;<endl;< p="">

waitKey(0);
return 0;

What is the meaning of this function "sum", sum(img)[0] is standing for?? sum(img)[1] is standing for ? sum(img)[2] is stranding for??