转一个光学设计论坛里的帖子 qGXY
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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 X? l5}
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一个是DISTORTION,另一个是TV DISTORTION RA$%3L[A!
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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 _C54l
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What is distortion? hQ@E2 Xsv
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. 'D:R]@eK]
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Calculating formula %5ovW<E:
TV distortion (Dtv) = Δh/2h x 100 (%) rX}FhBl5
A positive value of TV distortion indicates ^:u-wr8?{
pincushion distortion and a negative value Ial"nV0>0
indicates barrel distortion. ^r@,(r6w
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原帖网址:http://www.opto-tech.com/read.php?tid-3086.html 7tP
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