转一个光学设计论坛里的帖子 ~sU?"V qX{X4b$ 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 px|>v8 *el(+ib% 一个是DISTORTION,另一个是TV DISTORTION ~#"7,r Qp *i?rJH 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 5BHOHw D{ :,NFFN -
LiPHHX< ?Z Rkn+; What is distortion? /e|[SITe 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. 2K]IlsMO& ^+*GbY$' Calculating formula wKk
3)@il TV distortion (Dtv) = Δh/2h x 100 (%) kz0I2!bt A positive value of TV distortion indicates -4e)N*VVu pincushion distortion and a negative value {b'}:aMc indicates barrel distortion. EK?@Z.q+ RQ^m6)BTo 原帖网址:http://www.opto-tech.com/read.php?tid-3086.html ]eYd8s+ K[uY+!'1