Hi

I'm having a debate with a reviewer on an upcoming Phantom 3 photogrammetry paper. Could someone please clarify the exact form of the distortion correction used in the old V1.1? If we assume no tangential effects and neglect K4, which of these 2 forms would be correct

(1) K1*r^2 + K2*r^4 + K3*r^6

OR

(2) r*(K1*r^2 + K2*r^4 + K3*r^6)

Obviously the key diffference is that r factor at the start of (2) and whether or not Ks ultimately work in even or odd powers of r

Thanks

Patrice