Undistortpoints In Opencv (cv2) With Python Wrong Results

I try to rectify an image and some points, which are on this image. Rectifying the image works very well (this part of the code is not from me): (mapx, mapy) = cv2.initUndistortRec

Solution 1:

so I found my error: I have to use the old and the new camera matrix in cv2.undistortPoints like in cv2.initUndistortRectifyMap.

so to correct it I just used this code:

point_matrix_new = cv2.undistortPoints(point_matrix,camera_matrix,dist_coefs,P=newCameraMatrix)