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I have the following barrel-distorted fisheye image:

And I am finding the corners in it using the findChessboardCorners function as follows:

cv2.findChessboardCorners(gray, CHECKERBOARD, cv2.CALIB_CB_ADAPTIVE_THRESH | cv2.CALIB_CB_FAST_CHECK | cv2.CALIB_CB_NORMALIZE_IMAGE)

However, I'm getting no corners, i.e., this function returns False, None. Why is that?

I have the following barrel-distorted fisheye image:

And I am finding the corners in it using the findChessboardCorners function as follows:

cv2.findChessboardCorners(gray, CHECKERBOARD, cv2.CALIB_CB_ADAPTIVE_THRESH | cv2.CALIB_CB_FAST_CHECK | cv2.CALIB_CB_NORMALIZE_IMAGE)
cv2.CALIB_CB_NORMALIZE_IMAGE)