a comparison of two license plate acquiring methods ubiquitous computing david filipovic
TRANSCRIPT
Speech vs. typingA comparison of two license plate acquiring
methods
Ubiquitous computingDavid Filipovic
Police officers -> always on the move
Acquiring license plate numbers while driving
What is better?
The problem
Police officers in charge of safety
We can also help to keep them safe
Why?
Assumed: typing has more adverse effects on driving performance
Possible explanation: More time spent looking off road
Assumptions – the hypothesis
Conduct a study using the driving simulator Have participants drive and perform under
tasks experimental conditions
Collect data
Approach (1)
Driving scenario: 2-lane highway Vehicles approached from their right
Primary task: driving Secondary task: collecting license plates
Approach (2)
Driving performance data◦ Lane position, steering wheel angle, PDT…
Physiological data◦ EKG, skin conductance, pupil diameter
Qualitative data◦ Participants’ opinions, NASA-TLX
Data collected
A ruggedized keyboard for the typing task
Ambient speech recognition (100% accuracy)
The setup
Four male subjects
Aged 22-25, average: 23.75
Experienced drivers
Proficient QWERTY keyboard users
Participants
The results (1)
Speech Typing0
10
20
30
40
50
60
NASA-TLX Workload rat-ing
Interaction type
NA
SA
-TLX
work
load r
ati
ng
Speech Typing0
1
2
3
4
5
6
7
Task completion time [s]
Interaction type
task c
om
ple
tion t
ime [
s]
The results (2)
Speech Typing0
0.010.020.030.040.050.060.070.080.09
Mean lane position variance
Interaction type
mean lane p
osit
ion v
ari
ance
Speech Typing0
0.51
1.52
2.53
3.54
Mean steering wheel angle
variance
Interaction type
mean s
teeri
ng w
heel angle
vari
ance
ANOVA, p<0.022
The results (3)
800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000-4
-3
-2
-1
0
1
2
3
4
5
800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000-4
-3
-2
-1
0
1
2
3
4
5
speech typing
Steering wheel angle
Definitive presence of an effect
Future study with more participants
Conclusion
Questions?