Evaluation of Aberrations in the Optical System of the Human Eye Based on the Spatial Spectrum of a Diagnostic Image
نویسنده
چکیده
This study deals with the analysis of wavefront aberrations that occur in the image owing to curvature variations in the human eye cornea. The analysis is based on the Liou-Brennan human eye model. The surface curvature and wavefront aberrations are described using Zernike polynomials. Our approach involves evaluating parameters of the distorting system's transfer function and measuring the expansion coefficients based on pattern recognition methods. Constructing a feature space of medical images enables the evaluation of aberrations in the eye optical system to be performed.
منابع مشابه
Study of Optical Models Regarding the Human Eye
Introduction: Until now, many models have been presented for optical study of the human eye. In recent years, surgery on the anterior section of the eye (such as cataract and photo-refractive surgery) has increased, so a study on the optics of the eye and evaluation of vision quality has become more important. Material and Methods: In this article, some of these models are considered. They incl...
متن کاملاصلاح توام نقص ابیراهی لنز دوربین و خطای خروج از مرکز تصویر با بهره‌گیری از مدل اصلاح شده زرنیک
Reduction of the quality of the image formed by an optical system is a function of different parameters such as lens aberrations, CCD digitization errors, and the errors of system assembling. Assembling errors usually consist of two types: 1) the prism error, which is the error of non-orthogonality of the optical axis and the image plane 2) the de-centering error, which is error of not passing ...
متن کاملThe Evaluation of Yellow vs. Blue Color Contrast Sensitivity pre and Post LASIK
Introduction: contrast sensitivity is one of the most important psychophysical tests that may be used for the evaluation of refractive state of eye and retinal image quality. Yellow vs. blue color contrast sensitivity may be more suitable in this regard. Materials and Methods: thirty myopic eyes were considered in this study. Yellow vs. blue color contrast sensitivity was evaluated under the sa...
متن کاملA Quantitative Investigation on the Effect of Edge Enhancement for Improving Visual Acuity at Different Levels of Contrast
Background: The major limitation in human vision is refractive error. Auxiliary equipment and methods for these people are not always available. In addition, limited range of accommodation in adult people when switching from a far point to a near point is not simply possible. In this paper, we are looking for solutions to use the facilities of digital image processing and displaying to improve ...
متن کاملThe Mechanical Design of Drowsiness Detection Using Color Based Features
This paper demonstrates design and fabrication o f a mechatronic system for human drowsiness detection. This system can be used in multiple places. For example, in factories, it is used on some dangerous machinery and in cars in order t o prevent the operator o r driver from falling asleep. This system is composed of three parts: (1) mechanical, (2) electrical and (3) image processing system. A...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2016