I have k1, k2, k3, k4 radial distortion coefficients for a fisheye lens. I want to convert them into a, b and c parameters to use with Hugin: http://hugin.sourceforge.net/docs/manual/Lens_correction_model.html#Lens_distortion_a.2C_b_.26_c_parameters
This is all the data I have (including k1, k2, k3, k4 in the lens tag):
<camera width="2560" height="1920" layout="equatorial">
<pose>
<rotation m0="0.03483457" m1="-0.9967604" m2="0.0724933" m3="0.8140989" m4="-0.01377276" m5="-0.5805629" m6="0.5796806" m7="0.07924037" m8="0.8109818" yaw_deg="-35.55676" pitch_deg="-4.544904" roll_deg="90.79163"/>
<translation x_cm="-0.9366078" y_cm="-0.1736482" z_cm="-0.3043223"/>
</pose>
<optics>
<focal_length focal_pixels="1242.36"/>
<principal_point center_offset_x="2.571655" center_offset_y="10.38043"/>
<lens type="fisheye" k1="0.03462446" k2="-0.03762977" k3="0" k4="0"/>
<fisheye_radius radius_pixels="1570"/>
</optics>
</camera>
Doing the reverse would also be helpful, having a, b, c parameters get k1, k2, k3, k4 parameters.
Any chance someone can help me with this or point into the right direction?