LensDistortion.py 文件源码

def _findChessboard(self):
        # Find the chess board corners
        flags = cv2.CALIB_CB_FAST_CHECK
        if self._detect_sensible:
            flags = (cv2.CALIB_CB_FAST_CHECK |
                     cv2.CALIB_CB_ADAPTIVE_THRESH |
                     cv2.CALIB_CB_FILTER_QUADS |
                     cv2.CALIB_CB_NORMALIZE_IMAGE)

        (didFindCorners, corners) = cv2.findChessboardCorners(
            self.img, self.opts['size'], flags=flags
        )
        if didFindCorners:
            # further refine corners, corners is updatd in place
            cv2.cornerSubPix(self.img, corners, (11, 11), (-1, -1),
                             # termination criteria for corner estimation for
                             # chessboard method
                             (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER,
                              30, 0.001)
                             )  # returns None
        return didFindCorners, corners