Abstract Aiming at the problem of poor detection accuracy and inaccurate positioning traffic signs under foggy conditions, this paper proposes an improved YOLOv3 algorithm. Firstly, a data set Chinese in environment is constructed; The dark channel priori algorithm based on guided filtering used to process image with fog, which overcomes quality degradation caused by fog. Mosaic enhancement per...

purpose : to compare visual outcome of aspheric and spheric intraocular lenses (iols) implantation in patients with age-related cataract in terms of visual acuity (va), contrast sensitivity (cs) and spherical aberration methods : in this prospective randomized interventional study, 59 consecutive cases of senile cataract who had been admitted for cataract surgery to farabi eye hospital, tehran,...

In the present study, the lenses and ciliary bodies of 20 ostrich eyes were studied macroscopically and microscopically. The histological slides were studied after staining by hematoxylin and eosin, Verhoeff, Van Gieson, and periodic acid-Schiff (PAS). Posterior surface of lens was more convex than its anterior surface. The average lens diameter and thickness were respectively measured as 1.43 ...

Stereo reconstruction serves many outdoor applications, and thus sometimes faces foggy weather. The quality of the reconstruction by state of the art algorithms is then degraded as contrast is reduced with the distance because of scattering. However, as shown by defogging algorithms from a single image, fog provides an extra depth cue in the gray level of far away objects. Our idea is thus to t...

Bad weather, such as fog and haze, can significantly degrade the visibility of a scene. Optically, this is due to the substantial presence of particles in the atmosphere that absorb and scatter light. In order to deal with the information of fog image, a method for improving image definition based on image segmentation and image improvement technologies is presented. First of all, in accordance...

In this paper a new nonlinear signal processing technique, able to remove fog from color images exploiting the optical properties of the fog effect, is introduced. It is based on the use of cellular nonlinear networks (CNNs), a paradigm for nonlinear parallel image processing. The technique is applied to the analysis of several paintings by famous artists of different art movements, in which th...

An Adaptive Contrast image enhancement is proposed for degraded color images. The fogs are removed in two concerns, at initial stage the foggy image information’s are extracted which means that HIS components are obtained by converting RGB component from an input image. At second stage the Intensity (I) has been calculated by contrast enhancement and then adjusted with the value of atmospheric ...

This issue brief examines the recent history and trends in state budgets and considers how those trends have influenced the role of the Medicaid program. The paper offers several indicators for predicting the future of states' fiscal standing, cautioning that, although the "stormy" period from 2001 to 2003 is over, states face many challenges in he near future. This issue brief also poses sever...