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1.天津工业大学 电子与信息工程学院, 天津 300387
2.天津市光电检测技术与系统重点实验室, 天津 300387
[ "肖志涛(1971-), 男, 河北邯郸人, 博士, 教授, 2003年于天津大学获得博士学位, 主要从事图像处理与模式识别、医学图像处理、机器人视觉和光学设计等方面的研究。E-mail:xiaozhitao@tjpu.edu.cn" ]
[ "吴骏(1978-), 男, 河北玉田人, 博士, 副教授, 2007年于天津大学获得博士学位, 主要从事图像处理与模式识别、人工神经网络和医学图像处理等方面的研究。E-mail:zhenkongwujun@163.com" ]
收稿日期:2017-10-17,
录用日期:2017-12-6,
纸质出版日期:2018-05-25
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肖志涛, 娄世良, 吴骏, 等. 立体成像眼底相机光学系统设计[J]. 光学 精密工程, 2018,26(5):1054-1060.
Zhi-tao XIAO, Shi-liang LOU, Jun WU, et al. Design of optical system for stereo imaging fundus camera[J]. Optics and precision engineering, 2018, 26(5): 1054-1060.
肖志涛, 娄世良, 吴骏, 等. 立体成像眼底相机光学系统设计[J]. 光学 精密工程, 2018,26(5):1054-1060. DOI: 10.3788/OPE.20182605.1054.
Zhi-tao XIAO, Shi-liang LOU, Jun WU, et al. Design of optical system for stereo imaging fundus camera[J]. Optics and precision engineering, 2018, 26(5): 1054-1060. DOI: 10.3788/OPE.20182605.1054.
为了实现从不同角度同时拍摄同一眼底视网膜区域的图像,使采用双目立体视觉法进行眼底三维重建成为可能,设计了一种免散瞳立体成像眼底相机光学系统。该光学系统由成像系统和照明系统两部分组成,在成像系统中,使用Gullstrand-Le Grand眼模型来模拟正常人眼,运用体视显微镜成像原理进行分光设计;在照明系统中,通过设置黑点板的方式消除网膜物镜产生的杂散光,并加入环形光阑以避免角膜反射光的产生。设计结果表明,本立体成像眼底相机光学系统截止频率在95 lp/mm处各视场的MTF值均大于0.2,成像系统畸变小于-3%,场曲值小于0.1 mm,色差矫正良好,并且具有较强的调焦能力,能对-10~+5 m
-1
的人眼清晰成像。
A nonmydriatic optical system for stereo imaging fundus camera was designed in this work. It could simultaneously capture two images of the same fundus retinal region from different angles
and could enable three-dimensional reconstruction of the fundus. It comprised an imaging system and a lighting system. In the imaging system
the Gullstrand-Le Grand eye model was used to simulate the normal human eye
and the principle of stereomicroscope was employed to design the splitting optical system. In the lighting system
the stray light produced by the retinal objective lens was eliminated using a black dot board
and an annular diaphragm was used to prevent corneal light reflection. Simulation results reveal that the modulation transfer function of each visual field at the cut-off frequency of 95 lp/mm is greater than 0.2
the distortion of the imaging system is less than -3%
and the field curvature is less than 0.1 mm. The stereo imaging system is highly efficient in chromatic aberration correction and focusing
and can provide clear images for the human fundus with the diopters ranging from -10 m
-1
to +5 m
-1
.
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王肇圻, 王尧, 全薇.基于眼模型的非球面眼底荧光相机的设计[J].光学 精密工程, 2010, 18(7):1511-1519.
WANG ZH Q, WANG Y, QUAN W. Design of aspheric FFA camera based on eye model[J]. Opt. Precision Eng., 2010, 18(7):1511-1519. (in Chinese)
李淳, 孙强, 刘英, 等.眼底相机的均匀照明及消杂光干扰设计[J].中国光学与应用光学, 2010, 3(4):363-368.
LI CH, SUN Q, LIU Y, et al.. Design of uniform illumination system of fundus camera and its stray light shield[J]. Chinese Journal of Optics and Applied Optics, 2010, 3(4):363-368. (in Chinese)
王肇圻, 许妍.基于眼模型的数字眼底相机设计[J].光学 精密工程, 2008, 16(9):1567-1571.
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李春才, 巩岩, 李晶, 等.可诱导人眼自动调焦的眼底相机光学系统设计[J].光学学报, 2014, 34(4):422001.
LI CH C, GONG Y, LI J, et al.. Optical design of an inducible human eye accommodation fundus camera[J]. Acta Optica Sinica, 2014, 34(4):422001. (in Chinese)
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