转一个光学设计论坛里的帖子 e!J5h <:
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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 g7323m1=
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一个是DISTORTION，另一个是TV DISTORTION C9 +rrc@4
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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 YC;@ ^
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What is distortion? MR|A_e^x
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. `XF[ A8@h
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Calculating formula Q@}SR%p
TV distortion (Dtv) = Δh/2h x 100 (%) I;} U/'RR>
A positive value of TV distortion indicates Sm [#L`eqW
pincushion distortion and a negative value {
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indicates barrel distortion. [? "hmSJ
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原帖网址：http://www.opto-tech.com/read.php?tid-3086.html 3B;Gm<fJ9N
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