Input image were rectified

[ArtlyStyles]

Looks like the input image must be rectified. Could you please tell us how to rectify two original camera images?

[ethan-li-coding]

(1) if you are working with stereo camera, you should first calibrate your camera by tools, such as matlab and opencv, then rectifing.
(2) if you jush have two images , you can compute the fundamental matrix by extracting and matching feature points, then rectifing.

you can do the above two using opencv.