转一个光学设计论坛里的帖子 }`"}eN @,
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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 iS$[dC ?N
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一个是DISTORTION,另一个是TV DISTORTION rOSov"7
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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 ^[?y 2A:
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What is distortion? u&:N`f
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. 3oCI1>k
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Calculating formula z#tIa
TV distortion (Dtv) = Δh/2h x 100 (%) o<Zlm)"%1
A positive value of TV distortion indicates ]01`r/->\
pincushion distortion and a negative value {*yvvb
indicates barrel distortion. _?c.m*)A
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html P(D>4/f3"
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