http://code.opencv.org/issues/4359, for master

samples/cpp/stereo_calib.cpp

@@ -159,7 +159,7 @@ StereoCalib(const vector<string>& imagelist, Size boardSize, bool useCalibrated=
     {
         for( j = 0; j < boardSize.height; j++ )
             for( k = 0; k < boardSize.width; k++ )
-                objectPoints[i].push_back(Point3f(j*squareSize, k*squareSize, 0));
+                objectPoints[i].push_back(Point3f(k*squareSize, j*squareSize, 0));
     }
 
     cout << "Running stereo calibration ...\n";