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no, the disparity image has exactly the same size as the input, try to print it out:

cerr << imgLeft.size() << endl;
cerr << imgDisparity8U.size() << endl;

but i see this in your code:

 namedWindow(windowDisparity, WINDOW_NORMAL);

makes a "resizable" window, can it be, you resized it manually with mouse ? (the size will get saved in the registry or similar)