code: def _replace_bm(self):
          
          self._block_matcher = cv2.StereoSGBM(minDisparity=self._min_disparity,
                          numDisparities=self._num_disp,
                          SADWindowSize=self._sad_window_size,
                          uniquenessRatio=self._uniqueness,
                          speckleWindowSize=self._speckle_window_size,
                          speckleRange=self._speckle_range,
                          disp12MaxDiff=self._max_disparity,
                          P1=self._P1,
                          P2=self._P2,
                          fullDP=self._full_dp)
docs: Replace ``_block_matcher`` with current values.