# Difference between revisions of "General lens model"

 model name ideal projection $r=k_{{1}}\theta +k_{{2}}\theta ^{3}$ $r={\frac {(l+1)\sin \theta }{l+\cos \theta }}$ perspective projection(pinhole camera ) $r=f\tan \theta$ $r=\theta +{\frac {1}{3}}\theta ^{3}$ $l=0$ stereographic projection $r=2f\tan(\theta /2)$ $r=\theta +{\frac {1}{12}}\theta ^{3}$ $l=1$ equidistance projection $r=f$ 1 $l=$ Peleng $r=3f\sin(\theta /3)$ $r=\theta -{\frac {1}{54}}\theta ^{3}$ $l={\frac {19}{8}}$ quisolid angle projection $r=2f\sin(\theta /2)$ $r=\theta -{\frac {1}{24}}\theta ^{3}$ $l={\frac {527}{259}}$ orthogonal projection $r=f\sin(\theta )$ $r=\theta -{\frac {1}{6}}\theta ^{3}$ $l=\infty$