从莫尔偏折技术(MDT)测量镜片屈光度的原理出发,给出了镜片屈光度与莫尔条纹倾角的关系式。进行了实验采集,获取了MDT 实测镜片屈光度的莫尔条纹图。然后,基于莫尔条纹图像的特点,采用合适的图像处理算法对实测镜片的莫尔条纹图进行了灰度均匀化、降噪、图像增强、细化等一系列的数字图像处理操作,得到了镜片测量中莫尔条纹图形的清晰轮廓线。最后,给出了不同镜片屈光度的MDT 测量结果,并与焦度计的测量结果进行了比较。结果表明,莫尔偏折技术结合数字图像处理用于测量镜片的屈光度时,具有很高的测量精度。

From principle of the measurement of lenses’ power using Moiré Deflection Technology (MDT),formula of the relationship between moiré fringes’ tilt angle and lenses’ power was presented. After a series of experimental study,moiré fringes of the test lenses were obtained. Meanwhile,based on the character of moiré fringes,appropriate digital image processing such as gray scale equality,image enhancement,image thinning etc. was done,and distinct skeleton lines of the moiré fringes were provided. In the end,through proper data processing,measuring results of different lenses’ power were given,and they were compared with the measuring results tested by focimeter. Results show that adopting proper digital image processing methods for measurement of lenses’ power using moiré deflection technology has high precision.