How can I get 3x4 projection matricies of the first and the second cameras to use [`triangulatePoints()`](http://docs.opencv.org/2.4/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html?highlight=calibratecamera#triangulatepoints) if I have only [`struct detail::CameraParams`](http://docs.opencv.org/2.4/modules/stitching/doc/camera.html?highlight=cameraparams#detail::CameraParams) for each of two cameras which I got from [`detail::Estimator`](http://docs.opencv.org/2.4/modules/stitching/doc/motion_estimation.html?highlight=homographybasedestimator#)?
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