基于ARM的屈光度仪的设计

The design of the refractometer based on ARM

本文描述了国内首台基于S3C44B0X为核心的自动屈光度仪的主要部件设计以及软件实现思路。根据本系统所设计的光路,并通过系统中CMOS采集红外光在眼底视网膜中所成环状图像;对该图像进行处理,得到关键点;再通过三次样条函数插值,得出曲线函数;最终计算得出人眼的C(柱镜)和AX(散光轴位)以及S.(球镜)。系统快速的运算能力和适当的方法的运用。解决了以往屈光度仪精确度不够,以及不能校准的不足。

This paper described the software method and hardware design of the first auto refractomete in the country which is based on the CPU of S3C44BOX. According to the optical system designed of the system, it will display a circle image got by a CMOS camera from gathering an infrared ray reflected from the bottom？of retina. After processed the image, it can get the key points of circle image. Then it can get the curve function by using the cubic spline function method. Finally, it can calculate the cylinder, astigmatic axis and spherical, etc. The fast computing ability of the system and the proper methods for application resolves the defects of accuracy efficiency and calibration efficiency.