use of visual occlusion to assess in-vehicle hmi dean p. chiang dynamic research, inc., torrance, ca...
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USE OF VISUAL OCCLUSIONTO ASSESS IN-VEHICLE HMI
Dean P. ChiangDynamic Research, Inc., Torrance, CA
22 May 2003ITS America Annual Meeting, Minneapolis
Session 68b
ITSA 2003-68b 2
INTRODUCTION
• Interest in driver distraction
• Recent efforts to establish guidelines and evaluation procedures• SAE Recommended Practice J2364• AAM Guidelines• ISO TC22/SC13/WG8 work item
• Issues include:• Test procedures• Occlusion parameters• Task time
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LITERATURE AND DATA
• Some contemporary driver behavior and performance data
• Recent studies provided results for driver paced use of in-vehicle HMI; corresponds to real-world conditions without occlusion
• WG8 Occlusion Workshop 11/01 provided useful benchmark
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DRI OCCLUSION STUDY
• Primary task only, with occlusion
• Secondary task only, with occlusion
• Varied occlusion parameters to determine preferred boundary values
• Occlusion goggles vs. screen blanking methods
• Effect of task duration on driver performance and glance behavior
• Some details in SAE paper 2003-1-0128
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SIMULATOR SETUP
Roadway Scene
Secondary Task Touch Screen Layout
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EXPERIMENTAL PROCEDURES
• Drive in a safe manner
• Maintain position in lane center
• Maintain prescribed speed
• Primary task more important than secondary task
• Accurate entry more important than fast entry
• 18 Ss: 9F/9M, 40 avg. age
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EFFECT OF PRIMARY TASK OCCLUSION TIME ON LANE KEEPING PERFORMANCE
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 1 2 3 4
Occlusion Time (sec)
Std.
Dev
. of
Lane
Pos
ition
(m)
Duration
30 sec
60 sec
120 sec
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LANE KEEPING PERFORMANCE FORSUCCESSIVE RUN SEGMENTS
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 20 40 60 80 100 120
Run Duration (sec)
Std
. D
ev. of
Lan
e Pos
itio
n (m
)
Task
60 / 2 (1)
60 / 2 (2)
120 / 1
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OVERALL RESULTS
• OPEN times of 1.5 sec or greater provide satisfactory secondary task performance
• CLOSE times greater than 2 sec correspond to poor primary task performance
• Secondary task CLOSED times of 1-3 sec are acceptable
• No clear preference for screen blanking or goggles
• Relatively long secondary task durations (up to 1-2 min) do not degrade primary and secondary task performance, behavior, or ratings
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CONTACT INFORMATION
Dean P. ChiangTechnical Director(310) 212-5211 dpc@dynres.com
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