转一个光学设计论坛里的帖子 t1S~~FLE
9~yuyv4$
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 dPId=
w)
8b!_b2Za
一个是DISTORTION,另一个是TV DISTORTION W{d/m;<@N
7&1: ]{_
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 rg\w!L(
P9vROzXK
`<q5RuU
%s>E@[s
What is distortion? rB]/N,R
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. bv "S(
v]~[~\|a
Calculating formula ix;8S=eP~{
TV distortion (Dtv) = Δh/2h x 100 (%) ?%(*bRV -
A positive value of TV distortion indicates /_\4(vvf
pincushion distortion and a negative value zAewE@N#_
indicates barrel distortion. <*P1Sd.
l<+k[@Vox
原帖网址:http://www.opto-tech.com/read.php?tid-3086.html 5]E5 V@C
&7LfNN`