A multisensor electronic traveling aid for the visually impaired

2021 ◽  
pp. 1-9
Author(s):  
Abimbola M. Jubril ◽  
Segun J. Samuel
Keyword(s):  
Edge Detection ◽  
Visually Impaired ◽  
Laser Light ◽  
Laser Source ◽  
Ultrasonic Sensing ◽  
Straight Line ◽  
Wearable Electronic ◽  
Mobility Aid ◽  
Fusion Approach ◽  
Red Line

BACKGROUND: This paper considered the development of a wearable electronic mobility aid. METHODS: The developed system is based on the multisensor fusion approach of detection which combined three techniques, namely: a source of laser light, a camera and an ultrasonic sensor. A red line generating laser source is used to project a straight line and this is captured by the camera. The red line is deformed differently on coming in contact with holes or standing obstacles. The pattern of deformation is then extracted for obstacle and pothole recognition. The visibility of laser light is greatly reduced when the scene is extremely illuminated, so this is complemented with edge detection. The edge detection uses edges in the identification of holes and obstacles. This is combined with ultrasonic sensing, so that the presence of obstacles can be differentiated from that of holes. The outcome of detection and the distance of obstacles from the blind are relayed via an audio cue. REDULTS: Its evaluation showed better performance compared to the guide cane. It showed a reduction in collision rate by 83.25% and reduction in falling rate by 84.62%. The device received good acceptability from the users.

scholarly journals Camera Sensory System for Door and Stair Detection for Visually Impaired

2021 ◽  
Vol 10 (6) ◽  
pp. 109-113
Author(s):  
Shrugal Varde* ◽  
◽  
Dr. M.S. Panse ◽  
Keyword(s):  
Feature Extraction ◽  
Auditory Feedback ◽  
Visually Impaired ◽  
Sensory System ◽  
Indoor Environments ◽  
Blind Users ◽  
Test Environment ◽  
Extraction Algorithm ◽  
Mobility Aid ◽  
Key Features

This paper introduces a novel travel for blind users that can assist them to detects location of doors in corridors and also give information about location of stairs. The developed system uses camera to capture images in front of the user. Feature extraction algorithm is used to extract key features that distinguish doors and stairs from other structures observed in indoor environments. This information is then conveyed to the user using simple auditory feedback. The mobility aid was validated on 50 visually impaired users. The subjects walked in a controlled test environment. The accuracy of the device to help the user detect doors and stairs was determined. The results obtained were satisfactory and the device has the potential for use in standalone mode for indoor navigations.

scholarly journals Experiments of Ultrasonic Sensing Using FBG Sensors

2011 ◽  
Vol 2-3 ◽  
pp. 148-152
Author(s):  
Wei Wei Shi ◽  
Ting Ting Hu ◽  
Yue Gang Tan
Keyword(s):  
Tunable Laser ◽  
Angular Separation ◽  
Axial Direction ◽  
Laser Source ◽  
Testing System ◽  
Linear Change ◽  
Ultrasonic Signals ◽  
Response Characteristics ◽  
Ultrasonic Sensing ◽  
Set Up

This research aims at investigating the response characteristics of fiber Bragg grating sensors (FBGs) to ultrasonic signals. The testing system was set up with a tunable laser source and the FBGs installed on the surface of an aluminum plate. Then the response characteristics of FBGs were compared, in condition of putting the ultrasonic driving source in the different longitudinal, lateral and angular separation. Measurements were taken by changing the distance between the sensor and the transducer from 60 mm to 200 mm with a step of 20 mm. Then keeping the distance at 100 mm and 200 mm respectively, do the angular experiment with the angle from 0° to 90° by the step of 10°. Experiment results show that FBG can get better signals when the transducer is along its axial direction. When the location of the transducer is changed linearly, no obvious linear change of the signal strength has been found.

Experienced Lengthening and Shortening of a Straight Line Fixated in the Middle and Briefly Exposed

1973 ◽  
Vol 36 (3_suppl) ◽  
pp. 1023-1029 ◽  
Author(s):  
Kristian Holt-Hansen
Keyword(s):  
Full Length ◽  
Straight Line ◽  
Measured Time ◽  
Red Line

The stimulus was a vertical, straight, red line, 17 cm. long and about 2 mm. wide, which for 60 msec. was projected onto a medium grey screen 2 m. from S. Fixating the midpoint of the line S reported that the line lengthened upwards and downwards from the point of fixation to full length and then shortened to the point of fixation. The measured time of lengthening-shortening with fixation of the midpoint was identical with that of fixation of the nethermost point of the same line.

Blind and Sighted Children's Spatial Knowledge of Their Home Environments

1996 ◽  
Vol 19 (4) ◽  
pp. 797-816 ◽  
Author(s):  
Ann E. Bigelow
Keyword(s):  
Home Environment ◽  
Visually Impaired ◽  
Spatial Knowledge ◽  
School Age Children ◽  
School Age ◽  
Home Environments ◽  
Visual Ability ◽  
Spatial Understanding ◽  
Straight Line ◽  
Blind Children

The development of spatial knowledge of the home environment was longitudinally studied in three groups of school-age children who varied in their visual ability: totally blind, visually impaired, and normally sighted. The children were asked to judge which of three locations in their homes was the closest to a designated position: (1) judging by the routes necessary to get to the locations; and (2) judging by straight-line distances to the locations. Locations were either on the same floor as the designed position, on a different floor, or in the yard. Totally blind children were delayed in mastery of the tasks compared to the other children, particularly in judging straight-line distances between familiar locations. Their mistakes suggest that their spatial understanding of their home environments is based on their knowledge of routes between places rather than on their knowledge of the overall layout of the familiar space.

Miniaturized semiconductor MOPA laser source at 772 nm for the generation of UV laser light

2018 ◽  
Author(s):  
Alexander Sahm ◽  
Stefan Baumgärtner ◽  
Julian Hofmann ◽  
Patrick Leisching ◽  
Katrin Paschke
Keyword(s):  
Laser Light ◽  
Laser Source ◽  
Uv Laser ◽  
Mopa Laser

scholarly journals Ultrasonic Health Monitoring of Lithium-Ion Batteries

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 751 ◽  
Author(s):  
Yi Wu ◽  
Youren Wang ◽  
Winco K. C. Yung ◽  
Michael Pecht
Keyword(s):  
Data Fusion ◽  
Experimental Studies ◽  
Lithium Ion ◽  
Battery Management ◽  
Early Failure ◽  
Battery Management Systems ◽  
Ultrasonic Sensing ◽  
Battery Degradation ◽  
Fusion Analysis ◽  
Fusion Approach

Because of the complex physiochemical nature of the lithium-ion battery, it is difficult to identify the internal changes that lead to battery degradation and failure. This study develops an ultrasonic sensing technique for monitoring the commercial lithium-ion pouch cells and demonstrates this technique through experimental studies. Data fusion analysis is implemented using the ultrasonic sensing data to construct a new battery health indicator, thus extending the capabilities of traditional battery management systems. The combination of the ultrasonic sensing and data fusion approach is validated and shown to be effective for degradation assessment as well as early failure indication.

Sign in / Sign up

Export Citation Format

Share Document