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Ambiguity between Checkboard pose

Hi, There is an ambiguity between the checkerboard pose in the upright position and the checkerboard pose rotated 180 degrees vertically(upside down). I am using camera_pose_calibration which relies on image_cb_detector for checkerboard detection for calibrating multiple cameras. Holding the checkerboard upright, one of my cameras assumes it to be upside down during calibration. Any suggestions on how to rectify this?