scholarly journals Crystalline lens imaging during accommodation with a slit-scanning tomography system: preliminary results

2020 ◽  
Vol 238 ◽  
pp. 12015
Author(s):  
Jessica Gomes ◽  
Sandra Franco
Keyword(s):  
Crystalline Lens ◽  
Experimental Results ◽  
Wavefront Aberrations ◽  
Preliminary Results ◽  
Ocular Accommodation ◽  
Tomography System ◽  
Slit Scanning

A slit-scanning tomography system previously developed in the Centre of Physics of University of Minho allows to capture images of the eye and posteriorly calculus of the biometric (thickness and curvature) and optical (wavefront aberrations) properties of the corneal and crystalline lens surfaces. It is intended to optimise the system for an accurate computing of these properties of the crystalline lens in the relaxed state and during ocular accommodation. In this study, preliminary experimental results of the crystalline lens imaging of a subject during accommodation are presented.

An ultra-wideband microwave tomography system: Preliminary results

2009 ◽  
Author(s):  
C. Gilmore ◽  
P. Mojabi ◽  
A. Zakaria ◽  
M. Ostadrahimi ◽  
C. Kaye ◽  
...  
Keyword(s):  
Ultra Wideband ◽  
Microwave Tomography ◽  
Preliminary Results ◽  
Tomography System

Coverage Path Planning Using Mobile Robot Team Formations

2015 ◽  
pp. 214-247
Author(s):  
Prithviraj Dasgupta
Keyword(s):  
Path Planning ◽  
A Priori ◽  
Experimental Results ◽  
Future Research ◽  
Planning Problem ◽  
Coverage Path Planning ◽  
Preliminary Results ◽  
Time And Energy ◽  
Path Planning Problem ◽  
Multi Robot

The multi-robot coverage path-planning problem involves finding collision-free paths for a set of robots so that they can completely cover the surface of an environment. This problem is non-trivial as the geometry and location of obstacles in the environment is usually not known a priori by the robots, and they have to adapt their coverage path as they discover obstacles while moving in the environment. Additionally, the robots have to avoid repeated coverage of the same region by each other to reduce the coverage time and energy expended. This chapter discusses the research results in developing multi-robot coverage path planning techniques using mini-robots that are coordinated to move in formation. The authors present theoretical and experimental results of the proposed approach using e-puck mini-robots. Finally, they discuss some preliminary results to lay the foundation of future research for improved coverage path planning using coalition game-based, structured, robot team reconfiguration techniques.

scholarly journals Simultaneously measuring ocular aberration and anterior segment biometry during accommodation

2015 ◽  
Vol 08 (02) ◽  
pp. 1550005 ◽  
Author(s):  
Yuanyuan Wang ◽  
Yilei Shao ◽  
Yimin Yuan
Keyword(s):  
Anterior Segment ◽  
Crystalline Lens ◽  
Front Surface ◽  
High Order ◽  
Human Vision ◽  
Wavefront Aberrations ◽  
High Order Aberration ◽  
Key Factor ◽  
Set Up

In the human eye, accommodation is essential for functional vision. However, the mechanisms regulating accommodation and the ocular parameters affecting aberrations remain to be explored. In order to measure the alterations of ocular aberration and crystalline lens biometry during dynamic accommodative stimuli, we designed an optical coherence tomography with ultra-long penetration depth (UL-OCT) combined with a Shack–Hartmann wavefront sensor (SHWFS). This integrated set up measures human eye's anterior segment as well as monochromatic high-order aberrations (HOAs) with 6 μm resolution and (1/20) λ accuracy. A total of 10 healthy volunteers without ocular diseases were examined. Upon exposure to accommodative stimuli, the wavefront aberrations became larger. Among the anterior segment biometry, the anterior crystalline lens demonstrated significant curvature during accommodation and was the major cause of high-order aberration. These findings suggest that the front surface of the crystalline lens can significantly affect variation among aberrations, which is a key factor underlying the quality of human vision.

Real-time dynamic monochromatic ocular wavefront aberrations during accommodation: Preliminary results

2012 ◽  
Author(s):  
Sandra Franco ◽  
Cristina M Oliveira ◽  
Helder Tiago Correia ◽  
Sergio M. C. Nascimento ◽  
Jose Manuel Borges de Ameida
Keyword(s):  
Real Time ◽  
Wavefront Aberrations ◽  
Time Dynamic ◽  
Preliminary Results

scholarly journals DEEP LEARNING FOR 3D RECONSTRUCTION OF THE MARTIAN SURFACE USING MONOCULAR IMAGES: A FIRST GLANCE

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 1111-1116
Author(s):  
Z. Chen ◽  
B. Wu ◽  
W. C. Liu
Keyword(s):  
Deep Learning ◽  
3D Reconstruction ◽  
Experimental Results ◽  
Training Data ◽  
Network System ◽  
Stereo Images ◽  
Martian Surface ◽  
Preliminary Results ◽  
Low Level ◽  
Traditional Technology

Abstract. The paper presents our efforts on CNN-based 3D reconstruction of the Martian surface using monocular images. The Viking colorized global mosaic and Mar Express HRSC blended DEM are used as training data. An encoder-decoder network system is employed in the framework. The encoder section extracts features from the images, which includes convolution layers and reduction layers. The decoder section consists of deconvolution layers and is to integrate features and convert the images to desired DEMs. In addition, skip connection between encoder and decoder section is applied, which offers more low-level features for the decoder section to improve its performance. Monocular Context Camera (CTX) images are used to test and verify the performance of the proposed CNN-based approach. Experimental results show promising performances of the proposed approach. Features in images are well utilized, and topographical details in images are successfully recovered in the DEMs. In most cases, the geometric accuracies of the generated DEMs are comparable to those generated by the traditional technology of photogrammetry using stereo images. The preliminary results show that the proposed CNN-based approach has great potential for 3D reconstruction of the Martian surface.

scholarly journals Preliminary analysis of lip-wing concept using computational fluid dynamics and actuator disc theory

2021 ◽  
Author(s):  
Peter Walker
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Preliminary Analysis ◽  
Experimental Results ◽  
Disk Model ◽  
Preliminary Results ◽  
Actuator Disk ◽  
Actuator Disc

This thesis presents a preliminary analysis of the lip wing concept proposed by Dusan Stan of Aliptera Aircraft. A inviscid CFD-CAD actuator disk model was used to simulate a comparable geometry to that which was investigated experimental by Aliptera Aircraft. In general, a 10%-12% increase in thrust was produced at an optimal lip wing angle of 30o. This increase in thrust was consistent with the experimental results obtained by Aliptera Aircraft. These preliminary results are promising and encourage further research

Preliminary results of a new method for measuring the spectral absorption of the crystalline lens in vivo

2018 ◽  
Vol 44 (4) ◽  
pp. 512-513
Author(s):  
Manuel Gonzalez-de-la-Rosa ◽  
Marta Gonzalez-Hernandez ◽  
Paloma Rodriguez-Esteve ◽  
Carmen Mendez-Hernandez
Keyword(s):  
Crystalline Lens ◽  
New Method ◽  
Spectral Absorption ◽  
Preliminary Results
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