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your for loops are all broken, rather use a simple cout << some_mat << endl; to print them out, you'll see, everything is correct, then.

your for loops are all broken, rather use a simple

 cout << some_mat << endl;endl;
 

to print them out, or, if those are large, a roi of it:

 cout << some_mat(Rect(0,0,10,10)) << endl;

you'll see, everything is correct, then.

mat.at<int>(y,x);

your for loops are all broken, rather use a simple

 cout << some_mat << endl;

to print them out, or, if those are large, a roi of it:

 cout << some_mat(Rect(0,0,10,10)) << endl;

you'll see, everything is correct, then.

see, if your image is of type CV_32S, you would have to use:

mat.at<int>(y,x);

to access it, not any type you like. again, writing loops like above is bad,slow, and error-prone, avoid that at all cost !