转一个光学设计论坛里的帖子 !m_y@~pV#u
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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=YTgJ
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一个是DISTORTION,另一个是TV DISTORTION {}"
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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 ~$
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What is distortion? eeBw\f0
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. 5V0#_!QAN
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Calculating formula |w_l~xYV)
TV distortion (Dtv) = Δh/2h x 100 (%) &;vMJ
A positive value of TV distortion indicates J<cY'?D
pincushion distortion and a negative value <1~_nt~(*
indicates barrel distortion. 1':};}dCJ
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html !Xq5r8]
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