转一个光学设计论坛里的帖子 S\]9mHJI
-Bq]E,Xf)
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 <"K2t
Tg.
:@@`N_2?
一个是DISTORTION,另一个是TV DISTORTION p TaC$Ne
Wy\^}
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 ]#[4eaCg
$}IG+,L
=`*@OJHH
fN@ZJ~F%j
What is distortion? MLlvsa0
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. |Eh2#K0x4G
IhBQ1,&J
Calculating formula j D*<M/4
TV distortion (Dtv) = Δh/2h x 100 (%) mZXtHFMu
A positive value of TV distortion indicates iITMBS`}
pincushion distortion and a negative value s FJ:09L|
indicates barrel distortion. tK@7t0
vz#-uw,O:
原帖网址:http://www.opto-tech.com/read.php?tid-3086.html *DvX||`&
?(U;T!n