undistort with only 2 parameter distortion coefficients.

edit

Hi all, I am attempting to undistort some pre recorded footage, where I no longer have access to the camera. It was recorded with a camera system that calibrated and stored the intrinsic data. So far so good.

BUT, although the values for creating the camera matrix are as expected, the distortion coefficient values are based on a 2 parameter model.

Therefore the data I have is:

RADIAL="2.58565363397419e-007 1.56049733948831e-013"

opencv undistort function needs a 1 x 5 matrix, is that correct? How can I create this from 2 values?

Any help greatly appreciated!