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again please do not write loops for this. cv::Mat has a roi operator, allowing you to specify a subrect in a single line (also, without having to copy any data !):

Mat edges = ....
imwrite("left.png",  edges(Rect(0,0,           edges.cols/2,edges.rows)));
imwrite("right.png", edges(Rect(edges.cols/2,0,edges.cols/2,edges.rows)));