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You have to calibrate the cameras and also undistort and rectify the images. Once you have calibrated the cameras, you must not move or change the camera configuration (of course you can move the stereo rig) otherwise you will have to calibrate again.

Take a look at the samples:

• stereo_calib.cpp
• stereo_match.cpp

You have to calibrate the stereo cameras and also undistort and rectify the images. images before doing the stereo matching. Once you have calibrated the cameras, you must not move or change the camera configuration (of course you can move the stereo rig) otherwise you will have to calibrate again.

Take a look at the samples:samples (OpenCV 3.2):

• stereo_calib.cpp
• stereo_match.cpp