jacqueline |
2010-10-09 10:53 |
转一个光学设计论坛里的帖子 R!\EKH {Tp2H_EG 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 Rd*[%) ._Zt=jB 一个是DISTORTION,另一个是TV DISTORTION {tP%epQ _"a=8a06G 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 I27,mS+] 32)tJ|m IZ,oM!Y !RvRGRSyF What is distortion? <[ Xw)/# 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. a6xj\w uq3{hB# Calculating formula mB'3N;~ TV distortion (Dtv) = Δh/2h x 100 (%) &]6)LFm A positive value of TV distortion indicates {}~: &.D pincushion distortion and a negative value $^/0<i$ indicates barrel distortion. _u0$,Y?& | |