转一个光学设计论坛里的帖子 (f,D$mX
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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 )@DH&
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一个是DISTORTION,另一个是TV DISTORTION 0zCe|s.S&
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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 0K <@?cI
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What is distortion? _Pjo9z
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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. //2G5F ;
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Calculating formula ,F`:4=H%
TV distortion (Dtv) = Δh/2h x 100 (%) R?a)2jl
A positive value of TV distortion indicates 8zS't2
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pincushion distortion and a negative value Yv\.QrxPm
indicates barrel distortion. h?jy'>T?b2
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html 3P-qLbJ
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