presets
ideal (what a pinhole would give)
distorted (what the lens gives)
\(\displaystyle r^2 = x^2 + y^2,\quad
\m{x_d \\ y_d} = \underbrace{\left(1 + k_1 r^2 + k_2 r^4 + k_3 r^6\right)\m{x \\ y}}_{\text{radial}}
+ \underbrace{\m{2 p_1 x y + p_2\left(r^2 + 2x^2\right) \\ p_1\left(r^2 + 2y^2\right) + 2 p_2 x y}}_{\text{tangential}}\)
max displacement: 0.0 px
at the corner: 0.0 px