HOWARD: High-Order Wavefront Aberration Regularized Deconvolution for Enhancing Graphic Displays for Visually Impaired Computer Users

2006 ◽  
pp. 1163-1170 ◽  
Author(s):  
Miguel Alonso ◽  
Armando Barreto ◽  
Malek Adjouadi ◽  
Julie A. Jacko
Keyword(s):  
Visually Impaired ◽  
High Order ◽  
Computer Users ◽  
Wavefront Aberration ◽  
Graphic Displays

Human factors design of a video monitor emulator and display (VMED) for visually impaired computer users

1986 ◽  
Vol 10 (3) ◽  
pp. 255-264
Author(s):  
Gary W. Kelly ◽  
David A. Ross ◽  
Laura E. Moody
Keyword(s):  
Human Factors ◽  
Visually Impaired ◽  
Computer Users ◽  
Video Monitor

A Multimodal Board Game System Interface Using Finger Input for Visually Impaired Computer Users

2009 ◽  
pp. 68-77 ◽  
Author(s):  
Yusuke Hamaguchi ◽  
Daisuke Nagasaka ◽  
Takahiro Tamesue ◽  
Kazunori Itoh ◽  
Michio Shimizu ◽  
...  
Keyword(s):  
Visually Impaired ◽  
Computer Users ◽  
Board Game

scholarly journals Precision Analysis and Error Compensation of a Telescope Truss Structure Based on Robotics

2020 ◽  
Vol 10 (18) ◽  
pp. 6424
Author(s):  
Rui Wang ◽  
Fuguo Wang ◽  
Yuyan Cao ◽  
Honghao Wang ◽  
Xueqian Sun ◽  
...  
Keyword(s):  
Engineering Application ◽  
High Order ◽  
Wavefront Aberration ◽  
Mirror Surface ◽  
Sensitivity Matrix ◽  
Support Structure ◽  
Inverse Kinematic Problem ◽  
Surface Error ◽  
Primary Mirror ◽  
Secondary Mirror

We propose a new secondary mirror support structure assisted by multi-robotics to improve the observation performance of vehicle-mobile telescope systems. A mathematical model of the displacement at the end of the robotic and the variation of telescope pitch angle is established, then the posture of the robotic is optimized by the Jacobian matrix iteration inverse kinematic problem method. Based on the new support structure, a high-order sensitivity matrix is proposed to establish the mapping relationship between the robotic misalignment and the Zernike coefficient, with the accuracy verified via the Monte Carlo method. The method of adjusting the secondary mirror to compensate the aberration caused by the primary mirror is proposed, and the relationship between the primary mirror surface error and the system error is established under different pitch angles before and after compensation. The experiment and simulation results showed that the adjustment calculated by the high-order sensitivity matrix method can effectively compensate for the misalignment caused by the robotics and the primary mirror surface error to a certain degree. After multiple iterations, the root mean square of the wavefront aberration was better than λ/15. This conclusion provides an engineering application reference value for the secondary mirror support and aberration correction technology of the vehicle telescope system.

Factors Affecting Traceability of Lines for Tactile Graphics

1979 ◽  
Vol 73 (7) ◽  
pp. 264-269
Author(s):  
Billie Louise Bentzen ◽  
Alec F. Peck
Keyword(s):  
Visually Impaired ◽  
Factors Affecting ◽  
Graphic Displays ◽  
Complex Display ◽  
Tactile Graphics ◽  
Task Behaviors

To facilitate appropriate line choice for tactile graphic displays, 42 visually impaired subjects traced four types of tactile lines in a simple display (without intersections), and in a complex display (having intersections). The lines were single smooth, double smooth (1/4 in. [. 635 cm] spacing), single rough, and double rough. Measures were taken of time to complete the task, “behaviors” other than the continuous tracing of a line, and “restarts,” in which subjects required assistance to complete the task. The results indicate which line types may be more readily traced in displays with and without intersections.

scholarly journals Screen navigation system for visually impaired people

2018 ◽  
Vol 12 (3) ◽  
pp. 114-128 ◽  
Author(s):  
James Francis Ohene-Djan ◽  
Sandra A. Fernando
Keyword(s):  
Navigation System ◽  
Visually Impaired ◽  
Computer Users ◽  
Limiting Factor ◽  
Content Type ◽  
Blind And Visually Impaired ◽  
Visually Impaired People ◽  
Scientific Diagrams ◽  
Noticeable Reduction ◽  
Navigation Method

Purpose The SETUP09 system consists of both navigation and a computer-aided drawing technique for people who are blind and visually impaired (BVI). The purpose of this paper is to address the need for a screen navigation technique, which can facilitate a user’s ability to produce art, and scientific diagrams electronically, by introducing a compass-based screen navigation method. Design/methodology/approach BVI computer users were tested using different screen navigation tasks to assess the accuracy and efficiency of this compass-based navigation technique by using a prototype (SETUP09) and tactile paper grid maps. Findings The results confirmed that the compass-based navigation facilitates higher accuracy in screen-based moving and location recognition with a noticeable reduction in time and effort. Research limitations/implications Improvements such as the addition of a sound layer to the interface, use of hotkeys, braille and user speech inputs are yet to be tested. Social implications The current lack of suitable and efficient screen navigation technology is a limiting factor for BVI students and computer users in producing diagrams and drawings. This may place limitations on their career progression and life contentment. It is challenging for a BVI person to draw diagrams and art, which are commonly taught in education or used in industry. The compass-based screen navigation system was developed to address BVI users’ need to be able to create such content. Originality/value A compass-based navigation method enables screen navigation through a formal command language and enables intuitive movement to a screen location using matrix-style compass directions with zoom-in and zoom-out capabilities.

Multiple spatial sounds in hierarchical menu navigation for visually impaired computer users

2011 ◽  
Vol 69 (1-2) ◽  
pp. 100-112 ◽  
Author(s):  
Jaka Sodnik ◽  
Grega Jakus ◽  
Sašo Tomažič
Keyword(s):  
Visually Impaired ◽  
Computer Users

Representing Graphical User Interfaces with Sound: A Review of Approaches

2005 ◽  
Vol 99 (2) ◽  
pp. 69-84 ◽  
Author(s):  
Dan Ratanasit ◽  
Melody M. Moore
Keyword(s):  
User Interfaces ◽  
Visually Impaired ◽  
Graphical User Interfaces ◽  
Computer Users ◽  
Visually Impaired People ◽  
Impaired People ◽  
Auditory Interfaces

The inability of computer users who are visually impaired to access graphical user interfaces (GUIs) has led researchers to propose approaches for adapting GUIs to auditory interfaces, with the goal of providing access for visually impaired people. This article outlines the issues involved in nonvisual access to graphical user interfaces, reviews current research in this field, classifies methods and approaches, and discusses the extent to which researchers have resolved these issues.

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