转一个光学设计论坛里的帖子 %Eq4>o?D
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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 (?W[#.=7
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一个是DISTORTION,另一个是TV DISTORTION p 3`odmbN
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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 q{RH/. l
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What is distortion? kklM"Av
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. q'9}Hz
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Calculating formula V7}3H2]^
TV distortion (Dtv) = Δh/2h x 100 (%) ~E^lKe
A positive value of TV distortion indicates ;}W-9=81
pincushion distortion and a negative value 5,~Ju>y*
indicates barrel distortion. Pbo759q1
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html _(zPA4q8q
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