为了从不同的拍摄位置实时获取同一区域的眼底视网膜图像, 实现视网膜表面形貌的三维重建, 设计了一种基于双目立体视觉下的视网膜成像系统。系统由成像光路和照明光路组成。照明光路通过柯勒照明的方式为眼底提供均匀背景光, 并设置黑点板消除杂光; 成像光路通过反射镜组形成两个平行光路, 从两个光路同时拍摄同一区域的眼底视网膜图像。实验结果表明, 本系统放大倍数为7.3, 能在850nm的近红外光照明下实时拍摄到两组同一区域的图像。拍摄过程中视差角约为10°, 较好地校正了色差、球差等近轴像差。系统使将来与OCT技术融合, 实现深度信息图像和三维重建图像的拼接成为可能。

In order to obtain the fundus retina image of the same area from different shooting positions in real time and realize the three-dimensional reconstruction of the retinal surface topography, a retinal imaging system based on binocular stereo vision was designed. The system consists of an imaging light path and an illumination light path. The illumination light path provides uniform background light to the fundus through Kohler illumination, and sets a black dot plate to eliminate stray light. The imaging optical path forms two parallel optical paths through the mirror group, and simultaneously photographs the fundus retina image of the same region from the two optical paths. The experimental results show that the magnification of this system is 7.3, and the images of the same area in two groups can be captured in real time under the near-infrared illumination of about 850 nm. The parallax angle of the captured image is about 10°, and the paraxial aberration such as chromatic aberration and spherical aberration is preferably corrected. The system enables future integration with OCT technology, enabling the splicing of depth information images and 3D reconstruction images.