转一个光学设计论坛里的帖子 @DYx xM-
K29]B~0%E
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 b?-Ep?G'\
(,eH*/~/
一个是DISTORTION,另一个是TV DISTORTION w=Xil
D T^3K5
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 (q+U5Ls6
$a(EF
6
SGn:f>N
;L.@4b[lP
What is distortion? ,o-BJ
069
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. $FEG0&
:(EU\yCzK
Calculating formula |,F/_
TV distortion (Dtv) = Δh/2h x 100 (%) rt]
@Z`w
A positive value of TV distortion indicates ^y"Rdv
pincushion distortion and a negative value gc@,lNmi
indicates barrel distortion. 6P;JF%{J
:`6E{yfM
原帖网址:http://www.opto-tech.com/read.php?tid-3086.html e$|g
l+S08IZ