转一个光学设计论坛里的帖子 ,mkXUW
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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 b8Bf,&:ys
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一个是DISTORTION,另一个是TV DISTORTION #j!RbW
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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 k&TZ
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What is distortion? o|r8x_!+
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. 3W&f^*
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Calculating formula Q&Q$;s3|Y
TV distortion (Dtv) = Δh/2h x 100 (%) L$T23*9XY
A positive value of TV distortion indicates yiourR)H<
pincushion distortion and a negative value F ?APDGAN
indicates barrel distortion. I[P43>F3
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html l:' 0
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