眼底图像的三维重建

根据简化眼模型和眼底照相机光学系统简化模型建立了眼底图像三维重建的数学模型,分析了正常眼和屈光异常眼眼底图像与真实眼底视网膜形状的关系,导出了眼底二维平面图像到三维曲面图像的映射关系,最后给出了对眼底图像进行三维重建的实例.眼底三维重建图像的最大视场取决于眼底照相机的最大视场角,该最大视场角限制了重建图像的视场大小和三维重建时z轴的取值范围.根据给出的三维重建映射公式对眼底图像的二维数据进行三维映射后,再进行纹理映射,即可绘出重建后的三维眼底图像.该方法利用现有二维成像设备提供患者眼底三维重建图像,可为眼科医生在临床诊断和治疗时提供有益的参考和帮助.

Three-dimension Reconstruction of Ocular Fundus Image

The mathematical model for 3D reconstruction of ocular fundus images is constructed according to both the reduced eye model and the simplified model of fundus camera optical system.The relationship between the images of emmetropic and ametropic eye and the true shape of ocular fundus retina is analyzed,and then the mapping relationship from 2D ocular fundus plan image to 3D surface image is obtained.As a result,the real example of 3D reconstruction for ocular fundus images is given.The max visual field of ocular fundus image for three-dimensional reconstruction is decided by the max visual field angle of fundus camera,which limits a size of the visual field of 3D reconstruction image and a range of z axis.According to the formulas of 3D mapping,the 2D data of ocular fundus image is mapped to 3D data and then veins mapping is carried out;thereafter,the 3D surface image of ocular fundus can be drawn immediately.This method makes use of the existing 2D imaging equipments to provide 3D surface image of patient's ocular fundus,and can provide ophthalmologist with beneficial reference and help to their clinical diagnosis and treatment.