How do I estimate the radial distortion parameters for a given image?
<p>I have found the camera matrix for an image using DLT :</p>

<pre><code>P =

  3.8618e-03   7.1665e-04   1.9713e-03  -9.1510e-01
  3.1222e-05   4.4639e-03  -7.6783e-04  -4.0317e-01
 -5.9516e-07   1.1950e-06   1.7221e-06  -1.0115e-03
</code></pre>

<p>How do I proceed to find the radial distortion parameters.</p>

<p>Tools: OpenCV/Octave</p>