Distortion

Distortion is the ratio of the change between the center and edge areas of a captured image. Due to the aberration of the lens, the distortion is more noticeable at the edges of a captured image. There are two types of distortion: barrel distortion and pincushion distortion. The general rule is that when the absolute value of the distortion value is smaller, the lens offers higher accuracy.

Calculating formula

TV distortion (Dtv) = Δh/2h x 100 (%)

A positive value of TV distortion indicates
pincushion distortion and a negative value
indicates barrel distortion.