镜头孔径光阑与透视中心关系分析

Analysis of the position of lens perspective center relative to lens aperture stop

文章研究了相机镜头孔径光阑与透视中心之间的关系,阐述了孔径光阑的位置不仅决定了镜头透视中心的位置,也是产生图像畸变的一个重要因素,但孔径光阑大小的变化对透视中心的位置没有影响,只能改变像点的光照度与模糊度;通过镜头的光线追迹和实验分析,证明了镜头的透视中心在镜头的孔径光阑的入瞳位置,这些分析结果在PTZ变焦视觉精密测量与跟踪以及全景成像系统中具有重要的应用价值。

The relationship between the lens aperture stop and perspective center is investigated. It is shown that the lens aperture stop positions not only determine the position of the lens perspective cen- ter~ but also cause its image distortion. The size of the aperture stop does not influence the position of the lens perspective center, but it changes the irradianee and blurring degree of the images. The re- sults of ray tracing of the lens and experimental analysis show that the perspective center of a lens is just at the position of its entrance pupil. The investigation results are useful in the precision measure- ment, tracking and panoramic imaging with PZT cameras.