TV-distortion-TV畸变.doc

在光学设计中有人经常碰到这样的问题，光学镜头的指标中有两项对于畸变的要求

一个是DISTORTION，另一个是TV DISTORTION

其中的TV 畸变很多人不知道它的含义，再此给大家提供以下信息供参考，看了之后TV 畸变的概念就很清楚了

What is 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.

Barrel distortion

Pincushion distortion

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.