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A Smart Multisensor Approach to
Assist Blind People
in Specific Urban Navigation Tasks
一多重感測器協助盲人於城市中行走
B. Andò, Member, IEEE TRANSACTIONS ON NEURAL SYSTEMS AND
REHABILITATION ENGINEERING, VOL. 16, NO. 6, DECEMBER 2008
Presenter：I-Chung Hung
Date：2010/11/17
Outline
Introduction
 Overview of the Device Architecture
 Preliminary Results and Conclusion
 References

Introduction
Example

Jack lost his vision since a terrible traffic
accident. He can talk and walk normally, but just
can’t see anymore.
 Activity：go to school on foot
 Context environment：street, crossing place, … etc.
 Human skill：see and walk
 Assistive technology：long cane, electronic device, …
etc.
Context environment
Place
home
work space
school
community
Environment
alone
with friends
with strangers
Condition
light
sound
heat
cold
Human
See → Signals → Reaction
Walk
Assistive
Technology
Introduction
TO DATE, several aids have been developed to
improve the life quality of blind people from the
long cane to many electronic devices.
 In order to assist blind pedestrians the following
information is needed.

 location
 nature of obstacles
 boundaries of the path or travel surface
 spatial orientation
Purpose
Using a multi-sensor architecture and quite
complex smart post-processing to provide the
user with information useful to perform urban
mobility tasks, such as human detection and
walking in crowd conditions.
 Low cost and smart algorithm.

Overview of the Device Architecture
Device Architecture

The device is made of two units, the multisensor
probe and the processing unit.
 The multisensor probe has been implemented by a
sonar module and an infrared motion sensor.
 The processing unit includes electronics for sensors, a
microcontroller architecture for signal elaboration.
Device Architecture

The sonar module is a low-cost device assuring
good performances in a range of 10m with a
nominal accuracy less than 2%.
Device Architecture

Levels of alert can be interpreted as follow：1 =
free to go, 2 = move slowly, 3 = reduce speed, 4 =
stop, 5 = move to avoid collision.
Preliminary Results and Conclusion
Preliminary Results
Experiments were conducted both by experts and
blind people in supervised mode.
 A valuable behavior of the device was evidenced
in the walking mode, especially for young and
medium age people.

Conclusion
In a future version of the device, a tactile
interface will be included.
 The possibility for the user to choose the degree
and the redundancy of the information provided
by the device and the possibility to extend the
multisensor approach to other purposes.

Reference
Lead Bricks
The size of lead brick is usually 25 cm x 25 cm.
 There are two kinds of lead bricks.

Slope
According
to
the
standard of architecture
in Taiwan, the slope ≦
1/12.
 If the pitch under 75 cm,
consider the table.

Pitch
(cm)
Under
75
Under
50
Under
35
Under
25
Under
20
Under
12
Under
8
Under
6
slope
1/10
1/9
1/8
1/7
1/6
1/5
1/4
1/3
Intersection Device
Taiwan patent - M386792
Publish：2010/08/21
 Applicant：Technology and
Science Institute of Northern
Taiwan.
 IPC-A45B0/03：A cane combine
with other device.
 Total：194 items

Thank for your attention~