光学学报, 2017, 37 (3): 0333001, 网络出版: 2017-03-08   

基于均方根误差和相关系数评价人眼像差对视网膜像质的影响 下载: 628次

Evaluation of the Effect on Eye Aberration on Retinal Imaging Quality Based on the Root Mean Square Error and Correlation Coefficient
杨彦荣 1,2,3,*戴云 1,3
作者单位
1 中国科学院光电技术研究所, 四川 成都 610209
2 中国科学院大学, 北京 100049
3 中国科学院自适应光学重点实验室, 四川 成都 610209
摘要
视网膜成像质量的下降会减弱视力等视觉功能, 直接影响人们的日常生活。人眼像差是影响其像质的主要因素, 为了提高视网膜像质, 常用自适应光学矫正人眼像差, 以获得接近衍射极限的分辨力或理想像质。矫正波前像差的过程需要以分辨力或像质的评价作为依据。其评价方法大致分为基于瞳孔面和成像面两种, 这两种方法主要表征成像系统的分辨力, 但不能直观和定量地评价像质。而基于成像面的光学传递函数(OTF)法需要借助曲线面积等才能定量地评价像质, 且不同空间频率的像质不同。为此, 计算携带人眼像差的OTF, 以此模拟人眼成像过程, 直观地表征了像质变化。并重新定义均方根误差和相关系数, 分析人眼像差对它们的影响, 量化地反映各项像差矫正前后的像质变化。
Abstract
The decline in the quality of retinal imaging will reduce the visual acuity and other visual function, which directly affects people′s daily lives. Human eye aberration is the main factor affecting the image quality. In order to improve the retinal image quality, the adaptive optics is commonly used to correct the aberrations of the human eye. Thus, the resolution or ideal image quality which is close to the diffraction limit is obtained. But the process of correcting the wavefront aberration needs to evaluate the system resolution or the image quality as a basis. Mostly, the evaluation methods can be divided into two types which are based on the pupil plane and imaging plane. Although these two methods can mainly represent the resolving power of imaging system, they cannot directly and quantitatively evaluate the image quality. The optical transfer function (OTF) method based on the imaging plane needs the aid of the curve area to quantitatively evaluate the image quality. And the image quality of different spatial frequencies is different. Thus, the OTF of one eye aberration is calculated, which can simulate the process of human eye imaging. It is used to directly characterize the change of image quality. And the root mean square error and correlation coefficient are defined to analyze the influence of the aberration on them, which can quantitatively reflect the changes of the image quality before and after correcting each aberration.

杨彦荣, 戴云. 基于均方根误差和相关系数评价人眼像差对视网膜像质的影响[J]. 光学学报, 2017, 37(3): 0333001. Yang Yanrong, Dai Yun. Evaluation of the Effect on Eye Aberration on Retinal Imaging Quality Based on the Root Mean Square Error and Correlation Coefficient[J]. Acta Optica Sinica, 2017, 37(3): 0333001.

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