基于眼模型的数字眼底相机设计  

Design of digital retina camera based on eye model

作　　者：王肇圻[1] 许妍[1] 

机构地区：[1]南开大学现代光学研究所光电信息技术科学教育部重点实验室,天津300071

出　　处：《光学精密工程》2008年第9期1567-1571,共5页Optics and Precision Engineering

基　　金：国家自然科学基金重点资助项目(No.60438030);国家自然科学基金资助项目(No.60577015)

摘　　要：基于Gullstrand-Le Grand眼模型设计了一个视场角为30°的免散瞳手持式数字眼底相机。综合考虑人眼本身和外部系统的像差后，实现了全视场2×10^6 pixel的高清晰眼底成像；引入眼模型辅助设计，解决了人眼自身的色差问题，从而适用于白光照明。为避免角膜中心曲率大的区域反射引入杂散光，专门设计了环形光阑和共轴照明相结合的照明系统。结果表明，该相机系统成像分辨率〉120lp／mm，场曲值〈0．86mm，畸变仅为7．2％，色差值〈3．5μm，并且具有较大的调焦能力，对-10m^-1～7m^-1屈光度人眼普遍适用。A portable nonmydriatic digital retina camera in 30° field of view was designed based on Gullstrand-Le Grand eye model. By considering the aberrations of both human eye and camera, this design realized the highly clear image with 2 mega pixels in all fields of view. And an eye model was used in this design to diminish the chromatic aberration caused by the human eyes themselves, so that the camera could be used in a visible band. Meanwhile, the illuminating system with an annular stop and coaxial illumination was specially designed to remove the stray light caused by a cornea. The test ed result shows that the resolution of this system is higher than 120 lp/mm,and the distortion value is only 7.2% ,the field curve value and the chromatic value are less than 0.86 mm and 3.5 μm,respec tively. It comes to a conclution that this camera has strong focusing abilities, and adapts to different eyes from -10 m^-1 to 7 m ^-1.

关 键 词：光学设计 眼底相机 眼模型 

分 类 号：TB853.9[一般工业技术—摄影技术] TH702[机械工程—仪器科学与技术]