scholarly journals Wearable Radar System Design on Semi-Flexible PCB for Visually Impaired People

2022 ◽  
Vol 2 ◽  
Author(s):  
Haoran Zhang ◽  
Yiming Yang ◽  
Jiahao Zhou ◽  
Atif Shamim
Keyword(s):  
Antenna Array ◽  
Visually Impaired ◽  
Complete System ◽  
Obstacle Detection ◽  
Detection Range ◽  
Mimo Antenna ◽  
Visually Impaired People ◽  
Impaired People ◽  
Visually Impaired Persons ◽  
Flexible Pcb

This paper presents a compact and wearable frequency-modulated continuous-wave (FMCW) radar on a semi-flexible printed circuit board (PCB) for an anti-collision system. This can enable visually impaired people to perceive their environment better and more safely in their everyday lives. In the proposed design, a multiple-input multiple-output (MIMO) antenna array with four receivers (RXs) and three transmitters (TXs) has been designed to achieve obstacle-detection ability in both horizontal and vertical planes through a specific geometrical configuration. Operating at 76–81 GHz, an aperture coupled wide-beam patch antenna with two parasitic patches is proposed for each channel of RXs and TXs. The fast Fourier transform (FFT) algorithm has been implemented in the radar chip AWR1843 for intermediate frequency (IF) signals to generate a range-Doppler map and search precise target angles in high sensitivity. The complete system, which includes both the MIMO antenna array and the radar chip circuit, is utilized on a six-layer semi-flexible PCB to ensure compactness and ease in wearability. Field testing of the complete system has been performed, and an obstacle-detection range of 7 m (for humans) and 19 m (for larger objects) has been obtained. A wide angular detection range of 64-degree broadside view (±32°) has also been achieved. A voice module has also been integrated to deliver the obstacle’s range and angle information to visually impaired persons.

scholarly journals A Hands-Free Obstacle Detection and Avoidance System

2015 ◽  
Vol 5 (3) ◽  
pp. 801-804
Author(s):  
M. Abdul-Niby ◽  
M. Alameen ◽  
O. Irscheid ◽  
M. Baidoun ◽  
H. Mourtada
Keyword(s):  
Obstacle Avoidance ◽  
Visually Impaired ◽  
Low Cost ◽  
Cost Effective ◽  
Obstacle Detection ◽  
Text To Speech ◽  
Voice Signal ◽  
Visually Impaired People ◽  
Impaired People ◽  
The Voice

In this paper, we present a low cost hands-free detection and avoidance system designed to provide mobility assistance for visually impaired people. An ultrasonic sensor is attached to the jacket of the user and detects the obstacles in front. The information obtained is transferred to the user through audio messages and also by a vibration. The range of the detection is user-defined. A text-to-speech module is employed for the voice signal. The proposed obstacle avoidance device is cost effective, easy to use and easily upgraded.

The Use of Fax Technology to Address the Reading Needs of Blind and Visually Impaired Persons

1990 ◽  
Vol 84 (10) ◽  
pp. 509-513
Author(s):  
W. Gerrey ◽  
J. Brabyn ◽  
W. Crandall
Keyword(s):  
Visually Impaired ◽  
Office Workers ◽  
Preliminary Results ◽  
Blind And Visually Impaired ◽  
Visually Impaired People ◽  
Impaired People ◽  
Blind Persons ◽  
Visually Impaired Persons

Although fax communications pose a problem of accessibility for blind and visually impaired office workers, with centralized readers’ services they could be used to address the wider reading needs of blind and visually impaired people. With this technology, blind persons with fax machines could send unknown print to readers at a centralized readers’ service, who would read facsimiles of the documents over voice phones. This article discusses the specifications for appropriate equipment and protocols and presents the preliminary results of a study of such a system.

A Survey of Recreation Personnel in Agencies and Schools for Blind and Visually Impaired People

1991 ◽  
Vol 85 (2) ◽  
pp. 86-88
Author(s):  
I. Ludwig
Keyword(s):  
Continuing Education ◽  
National Survey ◽  
Employment Status ◽  
Visually Impaired ◽  
Educational Background ◽  
Professional Affiliation ◽  
Blind And Visually Impaired ◽  
Visually Impaired People ◽  
Impaired People ◽  
Visually Impaired Persons

This article reports on a national survey of recreation personnel in agencies and schools for blind and visually impaired persons. The survey addressed the personnel's employment status, educational background and continuing education experiences, professional affiliation, and interest in networking with other recreation personnel who work with blind and visually impaired persons.

scholarly journals THE LEVEL OF SOCIAL DISTANCE TOWARDS VISUALLY IMPAIRED PERSONS REGARDING TO OCCUPATION IN BOSNIA AND HERZEGOVINA

2016 ◽  
Vol 6 (1) ◽  
pp. 19-25
Author(s):  
Amela Teskeredžić ◽  
◽  
Dženana Radžo Alibegović ◽  
Senada Salkić ◽  
◽  
...  
Keyword(s):  
Bosnia And Herzegovina ◽  
Social Distance ◽  
Visually Impaired ◽  
Significance Level ◽  
Visually Impaired People ◽  
Significant Difference ◽  
Impaired People ◽  
Professional Contact ◽  
People With Intellectual Disabilities ◽  
Visually Impaired Persons

The aim of this study was to determine the level of social distance towards visually impaired people in relation to the occupation of respondents. The study included 361 adult respondents from the territory of Bosnia and Herzegovina, and who had no personal, not professional contact with persons with impaired vision. For the purpose of this study was used scale of social distance (Oullette-Kuntz, Burge, Brown, Arsenault, 2010), which is adapted in terms of required statements and opinions of respondents to visually impaired people, rather than toward people with intellectual disabilities. For statistical analyzes were used methods of descriptive statistics, and methods of analysis of variance (ANOVA). All results of the study were conducted at a significance level of 0.05. The results indicate that there is no statistically significant difference in the opinions and level of social distance in relation to the occupation of respondents.

scholarly journals Object Identification and Safe Route Recommendation Based on Human Flow for the Visually Impaired

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5343 ◽  
Author(s):  
Yusuke Kajiwara ◽  
Haruhiko Kimura
Keyword(s):  
Visually Impaired ◽  
Object Identification ◽  
Obstacle Detection ◽  
World Health ◽  
Detection Methods ◽  
Monocular Camera ◽  
Visually Impaired People ◽  
Average Accuracy ◽  
Impaired People ◽  
Health Organization

It is difficult for visually impaired people to move indoors and outdoors. In 2018, world health organization (WHO) reported that there were about 253 million people around the world who were moderately visually impaired in distance vision. A navigation system that combines positioning and obstacle detection has been actively researched and developed. However, when these obstacle detection methods are used in high-traffic passages, since many pedestrians cause an occlusion problem that obstructs the shape and color of obstacles, these obstacle detection methods significantly decrease in accuracy. To solve this problem, we developed an application “Follow me!”. The application recommends a safe route by machine learning the gait and walking route of many pedestrians obtained from the monocular camera images of a smartphone. As a result of the experiment, pedestrians walking in the same direction as visually impaired people, oncoming pedestrians, and steps were identified with an average accuracy of 0.92 based on the gait and walking route of pedestrians acquired from monocular camera images. Furthermore, the results of the recommended safe route based on the identification results showed that the visually impaired people were guided to a safe route with 100% accuracy. In addition, visually impaired people avoided obstacles that had to be detoured during construction and signage by walking along the recommended route.

Caseload Size Survey of Agencies Serving Blind and Visually Impaired Persons

1986 ◽  
Vol 80 (4) ◽  
pp. 683-684
Author(s):  
Leroy H. Pelton
Keyword(s):  
Visually Impaired ◽  
Public And Private ◽  
Blind And Visually Impaired ◽  
Visually Impaired People ◽  
Impaired People ◽  
Different Types ◽  
Visually Impaired Persons

A caseload size survey was conducted of both public and large private agencies serving blind and visually impaired people. Wide variations in caseload size were found between different types of professional caseworkers, between agencies, and between public and private agencies.

Sign in / Sign up

Export Citation Format

Share Document