Algorithm 1 Iterative algorithm to compute the inverse distortion

Require: point $P_n$

$P_c=P_n$

repeat

$r=\left|\right|P_c\left|\right|$

$dr=1+k_2{r}^2+k_4{r}^4+...$

$P_c=P_n/dr$

until Convergence of $P_c$

return $P_c$