:math:`p_2` are tangential distortion coefficients.
Higher-order coefficients are not considered in OpenCV. In the functions below the coefficients are passed or returned as
Higher-order coefficients are not considered in OpenCV.
The next figure shows two common types of radial distortion: barrel distortion (typically :math:`k_1 > 0` and pincushion distortion (typically :math:`k_1 < 0`).
.. image:: pics/distortion_examples.png
:align: center
In the functions below the coefficients are passed or returned as