转一个光学设计论坛里的帖子 ' XOWSx;Y
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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 \23m*3"W
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一个是DISTORTION,另一个是TV DISTORTION >52%^ ?
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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 gA] 3h8%w
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What is distortion? }Am5b@g"$Y
Distortion is the ratio of the change between the center and edge areas of a captured image. Due to the aberration of the lens, the distortion is more noticeable at the edges of a captured image. There are two types of distortion: barrel distortion and pincushion distortion. The general rule is that when the absolute value of the distortion value is smaller, the lens offers higher accuracy. EO/41O
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Calculating formula o"p['m*g
TV distortion (Dtv) = Δh/2h x 100 (%) py wc~dWvz
A positive value of TV distortion indicates |[)pQGw
pincushion distortion and a negative value S>s+ nqcP
indicates barrel distortion. g$JlpD&
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html Ns\};j?TU*
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