Adjustment of Digital Screens to Compensate the Eye Refractive Errors via Deconvolution

Eye glasses, contact lenses and medical operations can correct some refractive errors in the eye. However, some type of aberrations cannot be cured with current technology. In this case, people with refractive errors in their eyes encounter difficulties to interact with digital screens, one of the most important interaction medium between human and technological devices. In this work, a method of adjustment on digital screens is proposed for these people. By the point spread function of human eye being obtained, a digital screen or image can be changed by deconvolution method so that the patient can be given a clear vision. For the contrast problem arising due to the deconvolution, two new enhancement approaches, namely double-sided contrast enhancement and sigmoid mapping, are proposed. The proposed methods and the current technique to enhance contrast for the visually impaired people are compared both qualitatively and quantitatively.