转一个光学设计论坛里的帖子 zPqJeYK
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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 +h+ 7Q'k
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一个是DISTORTION,另一个是TV DISTORTION N\B&|;-V
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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 Nr `R3(X
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What is distortion? `4'=&c9
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. %A'mXatk
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Calculating formula FGHCHSqLq
TV distortion (Dtv) = Δh/2h x 100 (%) "``>ii
A positive value of TV distortion indicates DC*MB:c#U
pincushion distortion and a negative value JfSe;
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indicates barrel distortion. .!0Rh9yyl
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html pC,[!>0g8
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